坡耕地草篱系统中土壤阿特拉津残留的迁移规律  

Migration of Atrazine Residue in Hedgerow System on Sloping Croplands

作　　者：夏凡 陈传胜 李翠[2] 陈超 何建荣 党宏忠[3] 王庆海[2] XIA Fan;CHEN Chuansheng;LI Cui;CHEN Chao;HE Jianrong;DANG Hongzhong;WANG Qinghai(College of Environmental Science and Engineering,Central South University of Forestry and Technology, Changsha 410004;Beijing Research and Development Center for Grass and Environment,Beijing Academy of Agriculture and Forestry Sciences,Beijing 100097;Institute of Desertification Studies,Chinese Academy of Forestry,Beijing 100091)

机构地区：[1]中南林业科技大学环境科学与工程学院,长沙410004 [2]北京市农林科学院北京草业与环境研究发展中心,北京100097 [3]中国林业科学研究院荒漠化研究所,北京100091

出　　处：《水土保持学报》2018年第5期47-52,共6页Journal of Soil and Water Conservation

基　　金：国家"十二五"科技支撑计划项目(2012BAD14B02);国家重点研发计划项目(2016YFC0501704-4);湖南省自然科学基金面上项目(2016JJ2174)

摘　　要：为探索坡耕地中等高草篱对土壤阿特拉津残留迁移的影响,采用模拟降雨试验,研究华北地区不同坡度(15%和20%)条件下草篱系统中土壤阿特拉津残留迁移分布特征。结果表明:降雨后,土壤阿特拉津残留纵向迁移占主导地位。草篱处理篱带区阿特拉津残留量远低于无草篱对照的对应区域,篱带区各土层阿特拉津残留量相近,而无草篱对照残留量随土层深度增加而降低,且表层(0-10cm)显著高于其他层。草篱系统中不同篱域土壤阿特拉津残留量差异显著,篱带区<沉降区<作物区。最优尺度回归分析结果表明,草篱系统中各因素对土壤阿特拉津残留量影响程度从大到小依次为草篱>土层深度>土壤含水量>篱域>坡度>坡位,草篱的重要性超过其他因素。草篱显著影响坡耕地土壤阿特拉津的横向扩散和纵向迁移,可作为控制坡耕地农药流失的首选措施。For exploring the effects of contour hedgerows on the migration of atrazine residues in soil,the features of migration and distribution of atrazine residue those were influenced by hedgerow system under different slope gradients(15%and 20%)were studied by simulated rainfall experiment.The results showed that the vertical migration of soil atrazine remained dominant after rainfall.Grass hedges significantly reduced atrazine residues compared with the control.The residual levels of atrazine did not differ among 3 soil depths inside the grass hedges,whereas atrazine residues were markedly higher in topsoil than those in subsurface soil,and decreased with increasing soil depth in areas without hedges.Atrazine residues in the surface layer(0-10 cm)were significantly higher than those in other layers.Soil atrazine residues at different areas in the hedgerow system were significant different,and the ranks showed as:Hedgerow zone<deposition zone<crop zone.The optimal scaling regression analysis showed that the degree of influence of various factors on the atrazine residues in the soil was in descending order:Grass hedge>soil depth>soil water content>slope area>slope gradient>slope position,and the role of grass hedge was more important than that of the other factors.In general,the hedgerow can significantly affect the horizontal and vertical migration of the soil atrazine in sloping farmland,which is the primary factor to control the loss of agricultural pesticides.

关 键 词：阿特拉津 草篱系统 坡耕地 迁移 

分 类 号：X52[环境科学与工程—环境工程]