Urban and rural planning study

陳士豐 楊忠偉 王震 易鵬

Abstract：The article described the definition of atrophic urban fringe Firstly，and analyzed the core reason of low efficient utilization for land of atrophic urban fringe in China． The models and methods of reusing development of land resources had been claimed based on domestic and international land developing principle. Then the planning model which will proactively consider developing progress is named as“grey land”had been researched．The land transfer mode is firstly proposed as“secondary change to major，disadvantages change to advantages”. Short-term industrial land use area and long-term industrial land use area were also introduced to improve the performance of“grey land”in atrophic urban fringe plan，furthermore，it provided a new direction for atrophic urban fringe intensive land using in China.

Key words：atrophic urban fringe; Grey land; Short-term industrial land use area; Intensive Land Use

1. Introduction

Since the beginning of the opening up policy, with the rapid development of urbanization, urban has achieved rapid expansion in the space. The city administrative region border region——atrophy type fringe area as the urban construction land and collective land transition zone, is always the region with the most concentrated radiation, the most advantages with urban economic, the most potential and he most dynamic and uncertain region. At the same time, atrophic urban fringe is also the double gathering region for the urban to transfer industries and township enterprises. And the breakthrough for urban industry structure optimization adjustment and economic development model and model upgrade transformation.

However, in the development processing of atrophic urban fringe, there are a series of contradictions between city and society caused by the waste of land resource in the fringe area, and unsustainable development of urban economy Currently, under the existing china Urban and rural dual system, atrophic urban fringe has inevitably become the edge area of city management vacuum and overlapping zone, shrinking the blind development of industry of fringe area and land use type chaos and the blind pursuit of economic indicators brought the hidden danger for subsequent economic development, Attaches great importance to the quantity but despise quality, pay attention to scale but despise efficiency, pay attention to investment but despise plan , all are the critical reasons for causing problem.

In this paper, the edge of the area are classified and defined, and domestic and foreign relevant development model also have been studied. On the basis of referring and drawing lessons from the mature developing experience, the paper put forward the dynamic flexible planning method is suitable for the situation of our country for the atrophic urban fringe among them——gray land use planning method, and put forward industry for the first time“from the attached to the Lord, from short to long”update as the reference standard of land conversion mode, perfect gray land planning method is practical, finally, through exploring the“Gray land”in S city high-tech zone exploration atrophy type edge area planning layout, the introduction of short-term industry land and long-term industrial land, improve land for“grey”planning method in atrophy type fringes planning maneuverability, for our country atrophy type edge zone land intensive development provides a new way of thinking, and wish to promote the intensive development of atrophic type edge area, contain the waste of land resources.

2. Concepts and problems on atrophy type fringes

(1) The new classification method 1 fringes problem is faced by urban development to the stage of rapid urbanization problems to be solved. Fringe area is relying on urban development and produce a kind of discontinuous geographic entities,

is a country form of society, economy, culture and other elements to the urban form transformation zone, is the most sensitive in the development of urbanization, the most complex, the city one of the most intense radiation region, it has extremely strong transitional, mixture and dynamic.Narrow definition defines fringe area in edge area of city periphery, with a border of country, is a physical category on the scope, but with the development of urban society and economy, the narrow definition of the concept in solving contemporary urbanization process in the face of of all kinds of new Chen Shifeng: gray land spread -- a coordinated contraction fringes JinYuanQi elasticity of land use planning method Urban and rural planning study city Development research Vol. 23 January 2016 Urban Development Studies Vol. 23, No. 1 2016 71 problem of the limitation of the increasingly obvious, can No longer be accurate cognitive objective state of contemporary Urban fringe area. Zhong-wei Yang, in this case, 2012 published xu "based on the interests of the diverse contemporary Suzhou city fringe area spatial structure evolution of this paper proposes a new fringe area defined concept, and complement the limitation of traditional fringe area defined. This paper, the edge of the city area should not be defined simply on the basis of city administrative divisions and land use planning, and should be based on the existing urban land use, with the characteristics of society, population, industry includes physical category and economic category, the category of social comprehensive factors, such as the definition of classification in broad sense, so the edge area should not be defined only located in the outskirts of the city proper, inner cities there are a large number of the edge of the area, should consult the land properties, population structure, industry distribution, social form, settlement characteristics, landscape features, spatial elements, form elements such as boundary and regional evolution, divides the fringe area edge area can be divided into three kinds of : ① the main city and continues to expand the new type of fringe area;② main cities exist within the city proper and the area border, into squares, strip shape, shrinking atrophy type fringe area;③there is inside the city proper to point spread in blocks, fade the disappearance of the fringe area.

(2) define atrophy type edge area of atrophy type limbic areas, the urban construction land is adjacent city proper on the space expanded outward, thus formed in the borders are not converted to urban construction land collective land property of continuous area, along with the urban construction land development and construction, city plate is outspread, extrusion and cracks of collective land urban construction land will continue to be nibbled away, this area is shrinking. Atrophy type edge just who is superior, the city had a greater influence on the development of radiation, rural elements gradually degraded, formed on the collective land development integration of urban and rural elements coexist and the special form of region, the author will atrophy type fringe area is defined as:“to exist in the city within the scope of the border of the different city proper, country elements gradually weakened, and the urban construction land is expanding extrusion eroded into squares or strip continuous collective land, its geographical area shrinking, but not short-term death.”

(3) atrophy type edge area land use unsustainable problem atrophy type fringe area in the development of industry of blind development and land use confusion brought the hidden danger for subsequent economic development, the extensive use of land resources and inefficient use of configuration of city development are triggered the crux of the problem. Lead to atrophy type fringe area land development unsustainable problem basically has the following reasons. First, atrophic type edge area of transition zone in the city proper, the lack of practical and feasible implementation plan, let the edge of the grass-roots organization in the free development, and the early years of disordered planning free development directly cause the waste of land resources, at the same time, due to weak ability to execute, grass-roots government or organization under the condition of limited resources can't guarantee the subsequent development of atrophic type edge area, increased the waste of land resources. Second, speculative developers take a fancy to early atrophy type fringes superior location and land appreciation of space, a large number of hoarding is up for grabs, these basic idle undeveloped land, caused great waste of land. Although in 2012 promulgated the idle land handling method, but now China's cities at all levels of government in economic development mode, the current land were not of extensive inefficient utilization of land in the edge area of inhibition effect. Third, the period is too long for the transfer of land for industrial use.1990 promulgated by the state council of the People's Republic of China urban state-owned land use right transfer and transfer of provisional regulations stipulated in article 12: industrial land use of the land of the fixed number of year for 50 years .From shrinking industrial land, the edge area of the earliest enterprises obtain the high quality of land resources, industry lagged behind but after years of development, the production efficiency is low, are reluctant to flight; Advanced new investment industry, high production efficiency, but there was no suitable land to accommodate. Fixed number of year of the highest current land use right transfer is too long, the local government basic land transfer according to fixed number of year of the highest, to some extent, restricted the city's economic structure optimization and upgrading and land circulation.

(4) the development requirements of new normal to the edge contraction type urban development in China has gradually from the extensive type, dilated to fine, intensive transformation, under this new normal need innovation, city planning need to strengthen the urban design, emphasis on operational planning and dynamic, attaches great importance to the process rather than the final blueprint. Also the aim of the new urban planning under normal growth change from extensive growth to connotation, and land resources as an important element of urban development, played a vital role in urban development, the change in land use way, reversed transmission transformation development is currently in the process of urban planning effective operating methods.

Such as in April 2015, the Shanghai government issued and implemented the measures for the implementation of“Shanghai urban renewal, and put forward”land development complete lifecycle management policy: in order to land contract is a platform, full cycle of land development and operation management. And combined with urban renewal, gradually to real estate developers into a city operator, in order to realize the shift in land use way, reversed transmission urban development transformation.

Atrophy type as city each administrative region in urban fringe area in the development of cohesive zone, play a crucial role to urban sustainable development, under the new normal atrophy type edge area and land use planning layout should be intensive, high efficiency, enhance the contraction of land use planning and urban planning in the edge area of type of unity, operability and dynamic, based on market economy development, pay attention to the rationality of the development process of edge contraction type and sustainability, and to promote the development of the city transformation and urban and rural planning study Chen Shifeng etc: gray land——a coordinated spread atrophy of elastic JinYuanQi edge area of land use planning methods 72 city Development research Vol. 23 January 2016 Urban Development Studies Vol. 23 No. 1, 2016, improve the efficiency of land use.

3. Land development experience at home and abroad

(1) the Ruhr, Germany, emphasis on industry and land renewal process in the 19th century Ruhr industrial area is one of the most important industrial area in Germany. After the Second World War, under the impact of the global information technology revolution, the Ruhr industrial decline, traditional shortcomings of the original industrial structure, regional economic structure aging. So industry transformation and land development become an important task of the Ruhr. The Ruhr industrial structure transformation of land development is an important turning point he again rest garden international architectural exhibition (IBA) the establishment of institutions. The agency for the Ruhr region ecosystem, public space, and industrial culture of the update of the reform of regulation plan. Germany's Ruhr industrial area of land reclamation is given priority to with gradual improvement, to highlight the update transformation process rather than the ideal target. Through the change of land use ways to promote the second industry to gradually change the third industry, drive the regional industrial upgrading and transformation, in this mode, the Ruhr industrial structure by a single industry to the second and third industry with the combination ofintegrated industry development, the extensive development of industrial land to intensive and efficient, too.

(2) Shenzhen Shangbu - industry transformation to drive land redevelopment huaqiang north business district its predecessor is a typical industrial blocks shangbu industrial zone. In the early 1990 s, is one of the largest electronic product trading center in south China. With the change of the social economic environment, the third industry started to move, and through the leasing industry workshop and converted into commercial property, so far has become the most prosperous business district of Shenzhen Huaqiang north. Huaqiang north through the transformation of land use and urban renewal to change made, one by one step into the mercantile work more Can block .Shenzhen municipal government in 1998 to land redevelopment is of strong north in Huaqiang north industrial structure transformation of land development the important turning point, again on the original industrial lands within the building renovation, and perfect the green space landscape system, pedestrian space, public space and leisure facilities such as public and supporting facilities, etc. Businesses are encouraged to participate in land development process and again issued allow merchants in the overall reconstruction scheme based on building facade renovation and internal policies. Shenzhen Huaqiang north road business district land function transformation is actually follow the rules of market economy, is the result of the development of social nature. From the initial industrial zone of transition to the electronic products trading market to the ultimate urban comprehensive business circle, the whole process completely obey the market economy rule, not the pursuit of planning the ultimate results, pay attention to the regional development process of dynamic elastic Huaqiang north is one of the important factors of the success of the development mode.

London 3 crane wharf - the government set up the third party one-piece development operation mode in the late 19th century, London, crane docklands was one of the world's largest port complex at that time. After the Second World War, the London crane docklands gradually decline. Signed in 1980 the English parliament approved the London road, crane Development Company (range) and institutions ", set up urban development company to land way crane docklands development again. Crane docklands in London road take the market-oriented, encourage private investment in development strategy. Development process by LDDC authorized agent, is responsible for the requisition of land, land, such as repair work, unified planning will be divided into good plot after the auction to sell to developers, developers operate freely but don't do specific limits, is a natural evolution at the bottom of crane area and layout of urban landscape At the same time LDDC before each project development value assessment report submitted to the government, the report involves the development of the company's performance appraisal, using land property, capital budget, estimated output and provide jobs and other indicators. This kind of evaluation can effectively avoid the unfair distribution of social resources, urban development and reduce the phenomenon of incompatible between different land use, reduce crowding occurring in the process of land use, pollution and other issues. London so far way crane docklands has become one of London's most dynamic complex. Germany ruhr industrial area, Shenzhen shangbu industrial zone and crane docklands in London road, have been through from start to flourish and decline, and through the process of land development strategy to boom again. Through the methods of protection and renovation of old buildings to achieve the transformation and upgrading of the regional industry, improve the land use of intensive and high efficiency, and save a large amount of demolition and reconstruction costs. The Ruhr industrial area, shangbu industrial park and London crane docklands land redevelopment is follow the dynamic law of development of the market and planning to search for the ultimate blueprint and attention to the transformation of the dynamic process of development. These precious practical experiences for us on the edge of the atrophic type area on land utilization and land sustainable development provides a high reference value.

4. introduced a method of dynamic elastic planning - gray land planning method

introduced a method of dynamic elastic planning——gray land planning method the Ruhr industrial area, shangbu industrial crane docklands and London road, land development case again gives us about the redevelopment of urban land operation method, we need to explore these cases revelation to consider in advance of the urban land development strategy, to ensure that the premise of the interests of the whole city and the largest extent, effectively avoid the decline of the region. The second development of the city and the land reclamation effective connection with the social and economic progress, reduce the waste of urban resources and land resources.

(1) the concept of grey land in 2007, China academy of urban planning and design in the revision of the Suzhou industrial park zoning planning 2007-2020, to implement intensive and efficient urban development demand, coordination of urban construction and the forward recent hair Chen Shining etc: gray land spread——a coordinated contraction fringes JinYuanQi elasticity of land use planning method Urban and rural planning study city Development research Vol. 23 January 2016 Urban Development Studies Vol. 23, No. 1, 2016, 73 shows the relationship between the target and control city has potential value of resources, strengthen the operability, planning in suzhou industrial park, east new town (Suzhou) partition planning first mentioned the concept of Urban land for grey. In Suzhou industrial park, east new town (Suzhou) partition plan put forward the concept of the concept of grey land is a kind of special, mainly used in industrial land of two to three, and in the process of urban development, land for grey as a kind of elastic, is a form of land use transition in the process of land conversion. When land property cannot adapt to the urban development, can convert land to land properties needed for the social development. Therefore, under the condition of specific factors within the scope of the pollution in cities without danger are planning for various types of land gray land may .Definition so gray land is some immature development environment, the future development direction of uncertain plots or zones, land nature with a strong variability, land use structure is extremely unstable, not in accordance with the overall planning of the traditional land use planning one pace reachs the designated position, function, it can give replacement land properties when the regional industrial economic development to a certain stage, plots the original nature of the land cannot adapt to the urban development needs and the nature of replacement for the land use types.

(2) grey land for the applicability of atrophy type edge research gray land planning method is based on the original land use planning, in view of the land for land property is not clear, for future when external environment changed the nature of land use change of demand. Overall urban planning in the future urban development and exposed in the space layout of the control limits, it is difficult to accurately define the city in the future of urban development and policymakers accurate and land use structure form of the qualitative, the introduction of gray land, can effectively reduce the government's response to the industry development direction change passive; Reduce the frequency to planning revision, At the same time also can rise to land replacement cushion, promotes the displacement transfer of enterprise spatial location, ensure that land use efficient. Contraction cross between different land use type edge zone, in the process of urbanization by city strong economic radiation and human disturbance, the variability of the diversity of nature and its land use way and the instability of land use structure, built area are far more than any other city. Atrophy type fringe area has the following several features to meet the requirements of the applicable "gray land planning method: ① border city proper, staff liquidity is strong, with strong regional energy, the internal nature of land complex has strong uncertainty.② the atrophic type edge zone development environment is complicated, the ultimate blueprint planning xobjectives are difficult to step implementation. Gray land elastic can relieve the contradictions of development stages of urban operation, stimulates the urban vitality, effectively avoid have idle land requisition land is difficult to transfer caused by the waste of land resources, improve the operational planning.③location of traffic condition is good. Atrophy type edge area generally has a connecting adjacent road traffic in the city proper, which makes the land property has great variability, will shrink by fringe area planning is gray land, can be adjusted to adapt to the traffic facilities or land rapid changes in the value added.

(3) gray land for the applied research of atrophy type edge

①planning dynamic atrophy type fringe area is one of the areas of urban mixed variable, the uncertainty of future development, make its cannot step will in accordance with the overall planning of land use planning in place, the grey planning method for planning the long-term goals can be divided into several stages of process planning, complete the successive phases planning superposition forward complete land use planning goals. Atrophy type fringe area need to be at least two rounds of planning, some external factors complex area need to plan for many times, even gray land use planning is a continuous, dynamic process of relationship closely. On the edge of the atrophic type area in planning for the first time, need according to the basic situation of plot to locate, rational layout of land use planning, land use properties and functions, and consider in advance and subsequent planning of cohesion. Specific work are as follows: <1> network planning regulation, river, etc., give full consideration to the follow-up planning the layout of the demand, make the road network and systematic; <2> to consider in advance the use of architecture in the subsequent planning and transformation problem; <3> positioned to adjust according to the local industry development planning, land property of the science set up the planning for the first time; <4> the infrastructure subsequent planning set aside sufficient expanding space; <5> for the first time, subsequent reserved land planning and reasonable land use planning of flexible space. And planning for the first time should choose some land property rights clear, development cycle is short, the project for the state-owned property right as far as possible control. Short development cycle to ensure that land for grey dynamics and flexibility, clarity of property rights for gray land in the subsequent planning and transformation in the nature and function, at the same time protect the interests of all parties (figure 1).Atrophy type main work is the subsequent edge area planning of the stock of land in the previous planning development, on the basis of planning for the first time, to satisfy the demand of the new external environment and the development of land functions make reasonable adjustments. Its main job is to: <1> of the last planning of road network, and river systems, combing the need to adapt to the new land use function; <2> to use do not conform to the requirements of the development of land function and the nature of the land use conversion, such as "half astern into three", "three" thre-excellent etc. <3> the existing building scientific evaluation, keep high recycling value construction; <4> on the last planning of reserved land for elastic function layout, consider problem linking to the surrounding land; <5> infrastructure in the reserves last time try to use planning development facilities, according to the actual situation of urban and rural planning study Chen Shifeng etc: gray land——a coordinated spread atrophy of elastic JinYuanQi edge area of land use planning methods 74 city Development research Vol. 23 January 2016 Urban Development Studies Vol. 23 No. 1, 2016 of expansion in order to avoid unnecessary waste (figure 1).Source: figure 1 gray land use dynamic programming process in reference.

②efficient land resources sustainable use of urban land use planning is closely related to the urban industrial structure, reflects the spatial layout of city industrial structure. For city, the development of land resources is an important carrier, atrophy type edge area of land resources sustainable utilization is to adjust the economic structure and promote efficient urban economic transformation of the important measures. Land reasonable transformation can eliminate inefficient part of the land use function, make up for the part of the urban development and construction land gap, reorganize the new mode of production or shift operation mode, such as in April 2015, the Shanghai municipal government issued and implemented the measures for the implementation of Shanghai urban renewal, covers many aspects, the land development and the whole cycle of operations management. And combined with urban renewal, it is gradually to real estate developers into a city operator so as to realize the shift in land use way, reversed transmission urban development transformation. These not only pay great optimization from the land use efficiency, but also improve the corresponding function.

③plan land use in industry from attached to the Lord, from short to long update to the principle of displacement in gray land use planning approach, general land function transformation can be divided into the land of land is converted to the second industry and tertiary industries, by the industry land into land for the third industry and the secondary industry to the industrial land and so on four categories. Effective connection industry development and use of land resources, increasing the efficient sustainable utilization of land resources. Land resources in short-term type industry to forward displacement type industry as the main reference. The land resources use efficiency maximization, need low early start revitalize the land, cultivating the market, short-term for land selling, with small investment and the change of property right clear, flexible industry is given priority to. But in practice without the introduction of selective short-term sex industry, and fully consider the combination of reality and the local industry and the development direction of future industry, resulting in industry, resource utilization is low, thus influence the smooth displacement in the process of land in the future, directly to the health of the local economy and industry development have a huge reaction, this is at odds with the concept of grey land do more harm than good. Land resources with industry from attached to the Lord, from short to long update transformation, under the principle of land use planning should be closely integrated with industry planning, leading industry and focus on development of industry, the introduction of short-term type of industry to the leading industry and focus on the development of affiliated industries and supporting industries, industrial development and the simultaneous land replacement, in the industrial development to a certain stage to convert short-term to long-term industry, the corresponding type of short-term land for industry to the long-term dominant industry substitution.

(4) gray land operating mode, the state-owned holding company one-piece development the traditional pattern of auction - follow the objective law of market economy to the operation of land for development, can better adapt to the development of the city under the market economy. But, gray use fixed number of year of the planning of the land transfer, the ground buildings recycle, land property Settings, etc have special requirements, the tender - although transfer mode can largely alleviate the problem of insufficient government land development funds, reduce the risk of government development, promote the local development efficiency and vitality, however, gray land type and medium-term fixed number of year of the industrial land use land is shorter, because it is not clear in our country at present stage of the compensation mechanism of land use right expires ground assets, the high cost of the secondary development of compensation has been the second development of local government difficult the primary reason. By studying the case of crane wharf, London road, set up the third party one-piece development operation, the state-owned holding company, which was formed by the government on land for grey integrated development. gray land planning in the development for the first time, by the state-owned holding company on behalf of the government in housing demolition, land requisition, raise funds and infrastructure construction work, and according to the planning principles on the ground of the part of the land development, land rent ground facilities or short-term rent after development, and land transfer. Need to "gray land" in the second development, the state-owned holding company to unconditionally withdraw the right to use the land and ground facilities. The second land use planning and according to the gray land nature of land scale, land use and land boundary to transfer (figure 2).

5. Atrophic limbic areas in S city high-tech zone 4 gray land planning to explore

Atrophic limbic areas in S city high-tech zone 4 gray land planning to explore 2010 11 menstrual approval of the state council S upgraded to a national high and new technology industrial development zone, high-tech zone, and in 2013 is listed as one of the national intellectual property pilot park, with a total area of 23. 2 km2, is located enterprises 76, 2012 annual output value of about $12 billion, compared with the growth of about 17%; Completed investment in fixed assets of about 10, 800 million yuan, an increase of about 55%.Since 2010, S city high-tech zone has entered a new stage of rapid development from start-up. However, high-tech industrial agglomeration and use Chen Shifeng atrophy type fringes, such as: gray land spread——a coordinated contraction fringes JinYuanQi elasticity of land use planning method Urban and rural planning study city Development research Vol. 23 January 2016 Urban Development Studies Vol. 23, No. 1, 2016, 75 figure 2 gray land integration Development model source: in reference also exposed some problems in the Development process, including the layout of chaos, low level of industry, the allocation of resources, unreasonable, such as weak investment promotion (figure 3).

(1) S city high-tech zone atrophy type edge area range, determine the high-tech zone in S city city proper south S central urban area, a home port port of northern neighbour, something close to J and X town, city, northern lingang logistics park in the high-tech zone construction, chemical industry park, electronic information, new material hardware machinery textile science and technology park in western and eastern garden; In the high-tech zone and city S central junction is surrounded by all round the city south fringe area for typical atrophy type. Southern due to various causes in the development of the high-tech zone is established since the collective land and the urban construction land mutual crisscross, clutter is located a large number of small cities in the country industry, low private processing enterprises, industry and the village, the village of cheap cost of living in the migrant workers gather in large quantities. Under various factors lead to form bright elements coexist features, elements and the city or the country in strong radiation around the city under the influence of land use status and figure 3 S city high-tech zone source: since the author draw policy advantage and high-tech zone government urbanization, driven by strong country form the social, economic, cultural and other elements of fast to the urban form transformation, the characteristics of the area shrinking until complete urbanization (figure 4).Figure 4 high-tech zone atrophy type edge zone (source: author custom painting.

(2) grey land in S city layout atrophy type edge area south of kaibeite hi-tech zone as connected to the high-tech zone and S downtown area, the city has a important role, which forms a connecting link between the preceding and in the face of strong transitional edge area of atrophy type, mixture and dynamic, the final blueprint planning method obviously cannot effectively complete S city general planning of the region as a comprehensive regional goals and objectives, gray land planning method and land layout can be effective for the dynamics of future demand for land. The maximum extent to avoid the allocation of land resources is not reasonable and waste. At the same time can be in the government's response to make reasonable adjustments industry development direction change initiative; Reduce the frequency to planning revision, it Can also act as a cushion unnecessary social contradiction of land replacement, is advantageous to the enterprise spatial location displacement transfer of urban and rural planning study Chen Shifeng etc: gray land——a coordinated spread atrophy of elastic JinYuanQi edge area of land use planning methods 76 city Development research Vol. 23 January 2016 Urban Development Studies Vol. 23 No. 1, 2016, ensure the efficient land utilization. Fringe area of S city high-tech atrophy type "gray land" layout, recent land layout planning, and formulate follow-up two land preliminary layout, in stages to dynamically adjust the land resources use, control the development of the industry of the future, at the same time after two is addition to the first planning and land use planning for social and economic development now match the forecasting of land layout, is not deterministic, should make corresponding adjustment at any time with the local social and economic development, to avoid problems such as land resources and social economic development does not match (figure 5).The first great changes of land use planning in the external environment and the subsequent planning, without big changes in the scope of land layout should follow the subsequent planning goals. Figure 5 fringe area for land use evolution figure source: author custom painting.

Land resources with industry from attached to the Lord, from short to long update under the principle of conversion, short-term type industry to the forward displacement type industry as the main reference. The land resources use efficiency maximization, need low early start revitalize the land, cultivating the market, short-term for land selling, with small investment, property rights clear, change the leading industry of the flexible supporting industries is given priority to, such as Marine products industry, fiber processing industry, metal processing, logistics, etc. Can be introduced at the early stage of the developing local leading industries, such as Marine electronic equipment manufacturing, textile equipment manufacturing and other labor-intensive industries; The middle can introduce some transformation for real estate development and comprehensive technical services, equipment research and development, new materials research and development, business, realize "half astern into three" industries. Figure 6 lands for short-term type industry source: the author draw near the area of the main set up for short-term type industrial area (figure 6), these areas are greatly influenced by urban sprawl, complete the fastest urbanization, land exist strong variability, land space, there is a big appreciation type set to short-term industrial area is advantageous to the edge area of land and promote the efficient and intensive development in urbanization process, and to better coordinate JinYuanQi industry and land layout (figure 7 and figure 8).Figure 7 short-term type industrial land use evolution schematic source: author custom painting.

Chen Shifeng et al: gray land spread——a coordinated contraction fringes JinYuanQi elasticity of land use planning method Urban and rural planning study city Development research Vol. 23 January 2016 Urban Development Studies Vol. 23, No. 1 2016 775 epilogue in under the condition of our country has entered a stage of rapid urbanization, atrophy type fringe area land layout not only need to adapt to the objective law of market economy, but also to coordinate the various interests, meet the requirements of Urban Development under the new normal. Article introduced gray land planning methods, mainly based on passive half astern into three industry at home and abroad and the domestic industry and land use chaos phenomenon in a fringe area of thinking, and try to advance the concept of grey land "dynamic and flexible to guide the healthy development of efficient edge area of atrophy type, from the perspective of planning to shrink the edge area of land benefit, land use, the development sequence of the structure under effective control.

However, the theory of grey land system still need to gradually improve, especially on the edge of the atrophic type of empirical operation and research analysis will need to be further explored. Articles in S city hi-tech development zone as an example, combined with gray land concept put forward land conversion to industry from attached to the Lord, from short to long update as the reference standard, namely by short-term industrial land selling long-term to long-term industry land selling gradual transition of industrial integration of land use pattern, purpose is to improve the operability of the plan. But in the concrete industry classification principles, the nature of the land, the displacement method and the grey land scale control remains to be further exploration and practice.

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【作者簡介】

易鵬（1982—），男，四川廣安人，本科（2001-2005解放軍后勤工程學(xué)院土木工程本科進修學(xué)習(xí)，2002-2006重慶工學(xué)院工商管理本科）學(xué)歷，重慶市渝地北部開發(fā)建設(shè)有限公司助理工程師。