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时间:2020-04-18
《大豆重茬对黑土团聚体及腐殖质结合形态的影响-论文.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、第28卷第2期水土保持学报Vo1.28No.22014年4月Journa1ofSoilandWaterConservationADr.,2014大豆重茬对黑土团聚体及腐殖质结合形态的影响王莉,吴景贵,张志莹,杨天悦(吉林农业大学资源与环境学院,长春130118)摘要:选取正茬、重茬1年和重茬3年后的黑土,对其团聚体及腐殖质结合形态进行测定,探明大豆重茬对黑土团聚体及腐殖质结合形态的影响。结果表明,与正茬相比,重茬3年后土壤>5mm机械稳定性团聚体数量降低33.4;重茬3年的重组有机质和复合有机质、有机碳、pH值分别降低8.3,9.1,10.5%,0.19;重茬3年后土壤解氮含
2、量增加26.0;速效钾降低16.4。与正茬相比,重茬3年土壤的松结态腐殖质、稳结态腐殖质含量分别增加35.3,64.3;重茬3年的联结态腐殖质、紧结态腐殖质分别降低16.7,37.5;重茬3年的松结态胡敏酸增加62.5,联结态胡敏酸减少15.8。正茬土壤松结态胡敏酸的E/E显著高于重茬3年;而重茬3年稳结态胡敏酸的E/E。显著高于正茬。综上,大豆重茬对黑土中>5mm的团聚体数量及腐殖质结合形态产生了影响。关键词:大豆重茬;团聚体;腐殖质;结合形态中图分类号:S153.622;S152.4文献标识码:A文章编号:1009—2242(2014)02—0238—05Effectso
3、fSoybeanContinuousCroppingontheAggregationandCombinedFormsofHumusinBlackSoilWANGLi,WUJing—gut,ZHANGZhi—ying,YANGTian—yue(CollegeofResourcesandEnvironmentScience,JilinAgriculturalUniversity,Changchun130l18)Abstract:Selectingtherotation,continuous1andcontinuous3inblacksoil,theeffectofsoybeanc
4、ontinuouscroppingontheaggregationandcombinedformsofhumuswasstudiedinthisexperiment.Theresultsshowedthatitdecreasedby33.4that>5mmsizefractionparticlesofaggregatesofsoilmechanicalstabili—tvincontinuous3comparedwithrotation.Itgraduallydecreasedby8.3,9.1,10.5,0.19thatheavygroup.complexorganicma
5、tter,organiccarbon,pH,respectively.Thecontentofalkalinehydrolysisnitro—gencontentincreasedby26.0incontinuous3comparedwithrotation.Thecontentofavailablepotassiumdecreasedbv16.4incontinuous3comparedwithrotation.Thecontentoflooselyandstablycombined—HAincreasedby35.3,64.3incontinuous3comparedwi
6、throtation.Whilethecontentofunitedlyandtightlvcombined~HAdecreasedby16.7,37.5incontinuous3comparedwithrotation.Thecontentofhumicaddinloose1vcombinedincreasedby62.5incontinuous3comparedwithrotation.Thecontentofunited1vacidinlooselvcombineddecreasedby15.8incontinuous3comparedwithrotation.With
7、respecttocontinuous3,theloose1ycombined—HAofrotationresultedinsignificantaddingofE4/E6.WhiletheE4/ERofstablycombined—HAfromcontinuous3showedhigherthanthat{romrotation.Insummary,soybeancontinUOUScroppingaffectedonthe>5mmaggregationandcombinedformsofhumusi
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