坡耕地紫色土养分空间变异对土壤侵蚀的响应

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 成都山地所知识仓储（2009年以前）

	坡耕地紫色土养分空间变异对土壤侵蚀的响应
	苏正安; 张建辉
刊名	生态学报
	2007
卷号	27 期号:2 页码:459-464
关键词	^137Cs示踪土壤侵蚀土壤养分坡耕地紫色土
其他题名	Response of changes in soil nutrients to soil erosion on a purple soil of cultivated sloping land
通讯作者	张建辉
中文摘要	坡耕地土壤侵蚀导致土壤质量降低，并因此造成对作物产量的不利影响。利用土壤侵蚀测定的^137Cs示踪技术，结合土壤理化分析，研究了川中丘陵区紫色土坡耕地土壤侵蚀所引起的土壤再分配对养分空间变异性的影响。结果表明，川中丘陵区坡耕地土壤侵蚀是水蚀和耕作侵蚀共同作用的结果，强烈的耕作导致坡上部发生最为严重的土壤侵蚀。土壤侵蚀对土壤特性的空间变异性产生深刻影响，坡上部土壤有机质和养分贫瘠，而在坡下部相对富集；土壤有机质、全N、碱解N、有效P、K以及土壤粘粒含量在不同坡位之间出现显著差异。反映净余土壤再分配速率的^137Cs面积浓度与这些土壤理化特性均有密切的相关性。因此，^137Cs面积浓度可以作为表征侵蚀坡地土壤综合质量的指标。
英文摘要	Severe soil erosion on cultivated sloping land in hilly areas of Sichuan has resulted in deterioration of soil quality,and therefore has an adverse impact on crop production.We selected a hillslope of 110 m in length with a slope steepness of 10.12% where the soils were classified as Regosols.Soil samples for the determination of 137Cs,soil organic matter(SOM),total N,P,K,available N,P,K and particle size fraction were collected at 10 m intervals along a transect of the hillslope.Effects of soil erosion on soil nutrient loss were studied by using 137Cs technique,and the relationships between 137Cs-derived soil redistribution rates and soil nutrients were established over the cultivated sloping land in hilly areas of Sichuan,China(30°26’N,104°28’E).SOM,total N,available N,P,K and the <0.002mm soil particle size fraction were smaller at upper and middle slope positions where lower 137Cs concentrations were present(i.e.soil erosion rates were greater) than at downslope positions where 137Cs concentrations were higher(i.e.soil erosion rates were less).The lowest 137Cs concentrations were found in the hilltop,showing that besides water erosion,tillage erosion also contributed to soil losses,and intensive tillage was mostly responsible for severe erosion at upper slope positions.There were significant differences in soil OM,total N,available N,P,K and the <0.002mm soil particle size fraction between different slope segments,and these properties were significantly correlated with slope length.These soil properties were also significantly correlated with 137Cs concentration,indicating that both 137Cs and nutrient concentrations varied with topographical changes.The variation in soil properties was strongly influenced by erosion-induced soil redistribution,and therefore 137Cs concentrations mirroring soil redistribution rates would be considered as an integrated indicator of soil quality.
分类号	S157
资助信息	国家重点基础研究发展规划(973)资助项目(2003CB415202,2006CB403204)
语种	中文
公开日期	2010-09-08
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/1854]
专题	成都山地灾害与环境研究所_成都山地所知识仓储（2009年以前）成都山地灾害与环境研究所_山地灾害与地表过程重点实验室成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室
推荐引用方式 GB/T 7714	苏正安,张建辉. 坡耕地紫色土养分空间变异对土壤侵蚀的响应[J]. 生态学报,2007,27(2):459-464.
APA	苏正安,&张建辉.(2007).坡耕地紫色土养分空间变异对土壤侵蚀的响应.生态学报,27(2),459-464.
MLA	苏正安,et al."坡耕地紫色土养分空间变异对土壤侵蚀的响应".生态学报 27.2(2007):459-464.