單 穎,趙鳳亮,*,鄒剛?cè)A,李 瑋,何振立, Adel M R A Abdelaziz,4
(1.中國(guó)熱帶農(nóng)業(yè)科學(xué)院 環(huán)境與植物保護(hù)研究所,海南 ???571101; 2.農(nóng)業(yè)部儋州農(nóng)業(yè)環(huán)境科學(xué)觀測(cè)實(shí)驗(yàn)站,海南 儋州 571737; 3.佛羅里達(dá)大學(xué) 印第安河研究教育中心 食品與農(nóng)業(yè)研究所,美國(guó) 佛羅里達(dá) 34945; 4.埃及農(nóng)業(yè)研究中心 有機(jī)農(nóng)業(yè)中心實(shí)驗(yàn)室,埃及 開(kāi)羅 12619)
蚯蚓糞對(duì)海南甘蔗園磚紅壤氮素礦化和硝化的影響
單 穎1,2,趙鳳亮1,2,*,鄒剛?cè)A1,2,李 瑋1,2,何振立3, Adel M R A Abdelaziz1,2,4
(1.中國(guó)熱帶農(nóng)業(yè)科學(xué)院 環(huán)境與植物保護(hù)研究所,海南 ???571101; 2.農(nóng)業(yè)部儋州農(nóng)業(yè)環(huán)境科學(xué)觀測(cè)實(shí)驗(yàn)站,海南 儋州 571737; 3.佛羅里達(dá)大學(xué) 印第安河研究教育中心 食品與農(nóng)業(yè)研究所,美國(guó) 佛羅里達(dá) 34945; 4.埃及農(nóng)業(yè)研究中心 有機(jī)農(nóng)業(yè)中心實(shí)驗(yàn)室,埃及 開(kāi)羅 12619)
蚯蚓糞;磚紅壤;氮;礦化作用;硝化作用
1.1 試驗(yàn)材料
供試土壤采自海南澄邁永發(fā)鎮(zhèn)(109°56′45.8″E,19°44′7.4″N)甘蔗園耕層土壤,土質(zhì)為磚紅壤,質(zhì)地黏重。采集耕作層0~20 cm的土壤,置于陰涼處自然風(fēng)干,研磨過(guò)2 mm篩保存?zhèn)溆谩9┰囃寥纏H值5.62,全氮含量1.12 g·kg-1,全磷0.14 g·kg-1,全鉀0.68 g·kg-1,銨態(tài)氮18.55 mg·kg-1,硝態(tài)氮41.16 mg·kg-1。
1. 2 培養(yǎng)試驗(yàn)
試驗(yàn)共設(shè)置5個(gè)處理,蚯蚓糞與干土的質(zhì)量比分別為0(CK,不加蚯蚓糞)、1∶11(V1)、1∶5(V2)、1∶3(V3) 和1∶2(V4),每個(gè)處理設(shè)3個(gè)重復(fù)。具體如下:CK,360 g供試土壤;V1,30 g蚯蚓糞+330 g供試土壤;V2,60 g蚯蚓糞+300 g供試土壤;V3,90 g蚯蚓糞+270 g供試土壤;V4,120 g蚯蚓糞+240 g供試土壤。2016年10月31日,按照比例將蚯蚓糞與干土混勻,加入塑料培養(yǎng)瓶中,保持70%田間持水量,置于26 ℃恒溫恒濕培養(yǎng)箱中培養(yǎng),每隔3 d補(bǔ)充1次水分,并于培養(yǎng)開(kāi)始后的第2、8、16、26、38、52天取樣測(cè)定土壤理化性質(zhì)。
1. 3 測(cè)定方法
1. 4 數(shù)據(jù)分析
所有數(shù)據(jù)在Excel 2007軟件平臺(tái)上進(jìn)行整理和方差分析,對(duì)有顯著差異的處理采用Ducan法進(jìn)行多重比較,用Origin 9.0軟件作圖。
2.1 添加蚯蚓糞對(duì)土壤pH的影響
1.產(chǎn)品標(biāo)準(zhǔn):GB/T 19472.2—2004埋地用聚乙烯(PE)結(jié)構(gòu)壁管道系統(tǒng) 第二部分 聚乙烯纏繞結(jié)構(gòu)壁管材及相關(guān)標(biāo)準(zhǔn)。
不同蚯蚓糞添加量水平對(duì)土壤pH的影響如圖1所示。試驗(yàn)期間,CK處理的土壤pH值整體呈小幅增加趨勢(shì),52 d后與土壤本底值相比,升高0.66個(gè)單位。試驗(yàn)前期,添加蚯蚓糞的4個(gè)處理土壤pH差異顯著,整體呈下降趨勢(shì),至第8 d降至最低值,26 d后,土壤pH緩慢增加,培養(yǎng)結(jié)束時(shí),各處理土壤pH值分別比CK處理的土壤pH值高0.11~0.98個(gè)單位。
圖1 不同蚯蚓糞添加量下土壤pH隨培養(yǎng)時(shí)間的變化Fig.1 Dynamic changes of soil pH under different vermicompost application rates
2.2添加蚯蚓糞對(duì)土壤全氮含量的影響
不同蚯蚓糞添加量水平下,培養(yǎng)過(guò)程中土壤TN含量的變化情況如圖2所示。前16 d,CK處理的土壤TN含量迅速下降,隨后變化較小,至培養(yǎng)試驗(yàn)結(jié)束時(shí),較土壤本底值降低70.54%。添加蚯蚓糞的4個(gè)處理土壤TN含量在試驗(yàn)前期逐漸增加,至第8天時(shí)達(dá)到最大值,4個(gè)處理土壤TN含量分別為同期CK的1.96、1.94、1.72和2.40倍,說(shuō)明添加蚯蚓糞增加了土壤中的TN含量。之后,土壤TN含量迅速下降,16 d后,V1、V2和V3處理土壤TN含量小幅變化,V4處理土壤TN含量仍逐漸增加,試驗(yàn)結(jié)束時(shí),各處理土壤TN含量分別是同期CK處理的1.40、2.16、2.88和4.45倍。
2.3 添加蚯蚓糞對(duì)土壤礦質(zhì)氮含量的影響
培養(yǎng)過(guò)程中土壤礦質(zhì)氮含量的變化情況如圖3所示。整體來(lái)看,試驗(yàn)前26 d,土壤礦質(zhì)氮含量變化幅度較小,后期變化明顯。其中前8 d,各處理土壤礦質(zhì)氮含量小幅增加,隨后下降。添加蚯蚓糞的處理土壤礦質(zhì)氮含量至第16天降至最低值,26 d后,土壤礦質(zhì)氮含量迅速增加,至培養(yǎng)試驗(yàn)結(jié)束時(shí),各處理間差異顯著,各處理土壤礦質(zhì)氮含量分別是同期CK的1.21、1.62、2.04和2.83倍。
圖2 不同蚯蚓糞添加量下土壤TN 含量隨培養(yǎng)時(shí)間的變化Fig.2 Dynamic changes of soil TN under different vermicompost application rates
圖3 不同蚯蚓糞添加量下土壤礦質(zhì)氮含量隨培養(yǎng)時(shí)間的變化Fig.3 Dynamic changes of soil mineral N contents under different vermicompost application rates
圖4 不同蚯蚓糞添加量下土壤含量隨培養(yǎng)時(shí)間的變化Fig.4 Dynamic changes of soil N-N contents under different vermicompost application rates
圖5 不同蚯蚓糞添加量下土壤含量隨培養(yǎng)時(shí)間的變化Fig.5 Dynamic changes of soil N-N contents under different vermicompost application rates
2.4添加蚯蚓糞對(duì)土壤礦化作用和硝化作用的影響
不同添加量的蚯蚓糞對(duì)土壤礦化和硝化作用影響顯著,試驗(yàn)條件下土壤累積凈礦化氮量、凈礦化速率和凈硝化速率如表1所示。培養(yǎng)52 d后,土壤的累積凈礦化氮量、凈礦化速率和凈硝化速率均隨蚯蚓糞添加量的增多而顯著升高,V1、V2、V3和V4處理土壤的累積凈礦化氮量(凈礦化速率)分別為CK的1.47、2.40、3.35和5.13倍,凈硝化速率分別是CK的2.23、3.74、5.23和8.16倍??梢钥闯?,施用蚯蚓糞顯著促進(jìn)了土壤礦化和硝化作用的進(jìn)行。
表1添加蚯蚓糞對(duì)土壤累積凈礦化氮量、凈礦化速率和凈硝化速率的影響
Table1Effects of vermicompost on accumulated N mineralization content, net mineralization and nitrification rates in soil
處理Treatment累積凈礦化氮量AccumulatedNmineralizationcontent/(mg·kg-1)凈礦化速率Netmineralizationrate/(mg·kg-1·d-1)凈硝化速率Netnitrificationrate/(mg·kg-1·d-1)CK47.31±13.00c0.91±0.25c0.56±11.58dV169.74±3.44c1.34±0.07c1.26±3.05cV2113.72±11.83b2.19±0.23b2.11±11.58bV3158.68±1.79b3.05±0.12b2.95±7.67bV4242.90±18.18a4.67±0.16a4.60±8.99a
同列數(shù)據(jù)后無(wú)相同小寫(xiě)字母的表示差異顯著(P<0.05)。
Values within a column followed by different lowercase letters indicated significant difference atP<0.05.
本研究使用經(jīng)過(guò)風(fēng)干、過(guò)篩后的甘蔗園磚紅壤加水進(jìn)行培養(yǎng)試驗(yàn),經(jīng)過(guò)風(fēng)干后土壤樣品的理化性質(zhì)以及微生物數(shù)量和活性往往會(huì)發(fā)生變化。研究表明,風(fēng)干紅壤加水培養(yǎng)較新鮮土壤的微生物數(shù)量顯著增加,土壤微生物量碳、氮含量也隨之增加,能夠促進(jìn)土壤礦化作用,但由于硝化菌數(shù)量減少,硝化作用受到抑制[30]。另有研究指出,土壤風(fēng)干過(guò)程對(duì)硝化作用的影響因土壤性質(zhì)、利用方式等有所差異,對(duì)于旱地土壤沒(méi)有顯著影響[31]。本研究認(rèn)為,提高蚯蚓糞用量能夠顯著促進(jìn)土壤礦化和硝化作用的進(jìn)行,這可能還受到風(fēng)干土壤中微生物的影響;因此,為了更可靠地反映蚯蚓糞對(duì)田間土壤氮素實(shí)際礦化和硝化作用的影響,仍需開(kāi)展具有針對(duì)性的田間試驗(yàn)。同時(shí),蚯蚓糞添加條件下土壤氮素的轉(zhuǎn)化過(guò)程受土壤類型、蚯蚓糞性質(zhì),以及多種因素的影響,但當(dāng)前相關(guān)報(bào)道甚少,需要進(jìn)一步加強(qiáng)相關(guān)研究。本研究表明,蚯蚓糞可以促進(jìn)海南甘蔗園磚紅壤氮素的礦化和硝化作用,有利于土壤硝態(tài)氮的累積,但未開(kāi)展淋溶試驗(yàn)。海南氣候多雨,土壤保肥能力差,硝酸鹽的累積會(huì)提高土壤硝態(tài)氮的淋失風(fēng)險(xiǎn),這一過(guò)程還需進(jìn)一步研究明確。
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(責(zé)任編輯高 峻)
EffectsofvermicompostonnitrogenmineralizationandnitrificationoflatosolincanefieldinHainan
SHAN Ying1,2, ZHAO Fengliang1,2,*, ZOU Ganghua1,2, LI Wei1,2, HE Zhenli3, ABDELAZIZ Adel M R A1,2,4
(1.InstituteofEnvironmentandPlantProtection,ChineseAcademyofTropicalAgriculturalSciences,Haikou571101,China; 2.DanzhouScientificObservingandExperimentalStationofAgro-Environment,MinistryofAgriculture,Danzhou571737,China; 3.InstituteofFoodandAgriculturalSciences,IndianRiverResearchandEducationCenter,UniversityofFlorida,F(xiàn)ortPierce,F(xiàn)L34945,USA; 4.CentralLabofOrganicAgriculture,AgriculturalResearchCenter,Giza12619,Egypt)
vermicompost; latosol; nitrogen; mineralization; nitrification
單穎,趙鳳亮,鄒剛?cè)A,等. 蚯蚓糞對(duì)海南甘蔗園磚紅壤氮素礦化和硝化的影響[J]. 浙江農(nóng)業(yè)學(xué)報(bào),2017,29(11): 1890-1896.
10.3969/j.issn.1004-1524.2017.11.16
2017-05-05
國(guó)家公益性行業(yè)(農(nóng)業(yè))科研專項(xiàng)(201503106);海南省重點(diǎn)研發(fā)項(xiàng)目(ZDYF2016149);國(guó)家外國(guó)專家局高端外國(guó)專家項(xiàng)目(GDW20154600260);中國(guó)熱帶農(nóng)業(yè)科學(xué)院基本科研業(yè)務(wù)費(fèi)專項(xiàng)資金(1630042016004)
單穎(1990—),女,內(nèi)蒙古包頭人,碩士,研究實(shí)習(xí)員,主要從事農(nóng)業(yè)面源污染防控與土壤改良研究。E-mail:shanying@catas.cn
*通信作者,趙鳳亮,E-mail:zfl7409@163.com
S153
A
1004-1524(2017)11-1890-07