免耕覆盖对冬马铃薯土壤碳氮及氮素矿化菌的影响.pdf

《免耕覆盖对冬马铃薯土壤碳氮及氮素矿化菌的影响.pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、广西农业科学2010，41（10）：1093-1096GuangxiAgriculturalSciences·1093·免耕覆盖对冬马铃薯土壤碳氮及氮素矿化菌的影响黄景，康轩，梁和*，顾明华（广西大学农学院，南宁５３０００5）摘要：以传统耕作为对照，进行冬马铃薯免耕覆盖稻草８ｃｍ、免耕覆盖稻草８ｃｍ＋黑膜种植试验，探讨免耕覆盖对土壤碳氮及氮素矿化菌的影响。结果表明，各处理０～１０ｃｍ土层的土壤碳、氮含量及氮素矿化菌数量均高于１０～２０ｃｍ土层；０～１０ｃｍ土层两个免耕覆盖处理的土壤总有机碳、活性有机碳、全氮、碱解氮含量及氨化细菌、

2、硝化细菌数量均高于传统耕作，其中总有机碳、活性有机碳、全氮含量及氨化细菌数量达显著或极显著差异水平；１０～２０ｃｍ土层各处理的上述指标均无显著差异。说明免耕覆盖能增加表层土壤碳、氮含量及氮素矿化菌数量，有利于土壤有机氮素的矿化分解，为作物生长提供充足的速效氮素，是一项非常有效的配套性技术措施，适宜在生产上推广应用。关键词：免耕覆盖；土壤有机碳；氮素；氮素矿化菌中图分类号：S532.048文献标识码：A文章编号：１００２－８１６１（２０10）10－1093－０4Effectsofno-tillagewithcoverageoncar

3、bonandnitrogencontentsandnitrogen-mineralizingbacteriainsoilscultivatedwithwinterpotatoＨＵＡＮＧＪｉｎｇ，ＫＡＮＧＸｕａｎ，ＬＩＡＮＧＨｅ*，ＧＵＭｉｎｇ－ｈｕａ(AgriculturalCollege,GuangxiUniversity,Nanning530005,China)Abstract:Theexperimentwasconductedtostudytheeffectsofno-tillagewithcoverageoncarbona

4、ndnitrogencontentsandnitrogen-mineralizingbacteriainsoilscultivatedwithwinterpotato.Thesoilsweretreatedwith(1)traditionalcultiva鄄tion(CK);(2)no-tillagewithricestraw-covering(8cm);(3)no-tillagewithricestraw（8cm）andblackfilm-covering.Theresultsshowedthatthecarbonandnitr

5、ogencontentsandnitrogen-mineralizingbacteriain0-10cmdepthofsoilweresig鄄nificantlyhighercomparedtothosein10-20cmdepthofsoilineachtreatment.Thecontentsoftotalorganiccarbon,activeorganiccarbon,totalnitrogenandalkalinenitrogenandtheamountofammonifying-bacteriaandnitrobact

6、eriain0-10cmdepthofsoil,intreatments2and3,weresignificantlyhighercomparedtotraditionalcultivationtreatment.Thedifferencesofcontentsoftotalorganiccarbon,activeorganiccarbonandtotalnitrogenandamountofammonifying-bacteriabetweenthecoveragetreatmentsandCKweresignificantor

7、highlysignificantin0-10depthofsoil.However,nosignificantdiffer鄄encesoftheaboveindicatorsin10-20depthofsoilwereobservedbetweencoveragetreatmentsandCK.Theresultsrevealedthattheregulationofno-tillagewithcoveragemightincreasethecontentsofcarbonandnitrogenandamountofnitrog

8、en-mineralizingbacteriainsurfacesoil,andishelpfulfordecompositionandmineralizationoforganicnitrogeninsoilstoprovidesufficien