农牧交错区退耕还林地土壤恢复特征的研究-以内蒙古卓资县为例.docx

农牧交错区退耕还林地土壤恢复特征的研究-以内蒙古卓资县为例农牧交错区退耕还林地土壤恢复特征的研究-以内蒙古卓资县为例摘要：以卓资县退耕还林地为研究对象,探讨不同退耕还林地土壤理化性质的变化规律及改良作用.初步研究结果表明:退耕还林以后土壤黏粒总体含量均高于耕地,其中表土层增加不显著,亚表层、下层增加较多;在不同的退耕还林地中,表层土壤容重明显高于亚表层和下层的土壤容重;不同退耕还林模式下土壤有机质含量均随土层深度增加而递减,表现出明显的表聚性;不同林地类型之间的全量N、P、K的含量变化差异显著,而不同土层深度的`全量P、K的差异不显著;不同退耕林地的速效N、P、K的含量变化幅度较大.总体来看当地实施退耕还林后,对土壤的改良效果明显,有效的改善了当地生态环境.Abstract：ThispaperstudiesthesoilofconversioncroplandtoforestinZhuozicounty,exploringthelawofchangeinthenatureofthesoilphysicalandchemicalpropertiesandtheroleofimprovementtosoilindifferentfarmlandtoforests.Preliminaryfindingsshowthatthesoilclaycontentsweregenerallyhigherthanthoseofcultivatedlandafterreturningfarmlandtoforest,ofwhiehnosignificantincreaseinsurfacesoil,sub-surface,middleandlowerclassesincreasedconsiderably.Returningfarmlandtoforestindifferentplaces,thesurfacesoilbulkdensitywassignificantlyhigherthansub-surfaceandlowersoilbulkdensity.Differentmodesreturningfarmlandtoforestsoilorganicmatterlevelsweredecreasingwiththeincreaseinsoildepthandshowingacleartablecohesion.ThechangeofentireamountofN,P,Kcontentwassignificantlybetweenthedifferentforesttypes,whiletheentireamountofP,Kofsoilofdifferentdepthwasnotsignificant.TherangeabilityofcontenttoquickN,P,Kindifferentreturningfarmlandtoforestlandwasrelativelylarge.Overall,itwasobviouseffectsofsoilimprovement,andeffectivelyimprovethelocalecologicalenvironmentafterimplementationofthereturningfarmlandtoforestsinthelocal.作者：王同顺  郭建英  孙保平  李锦荣  WANGTong-shun  GUOJian-ying  SUNBao-ping  LIJin-rong 作者单位：北京林业大学,水土保持学院,北京,100083 期刊：水土保持研究 ISTICPKU Journal：RESEARCHOFSOILANDWATERCONSERVATION 年，卷(期)：2009, 16(6) 分类号：X171.1S153 关键词：农牧交错区  退耕还林  土壤理化性质  卓资县  Keywords：farming-pastoralzone  mandatoryconversionofmarginalfarmlandtoforestland  soilphysicalandchemicalproperties  Zhuozicounty