^(137)Cs法应用于流域土壤侵蚀初步研究——以太湖上游浙江省安吉县西苕溪为例  

Soil Erosion Using ^(137)Cs Method in Upper Reaches of Taihu Lake Basin:A Case Study of Xitiaoxi River Basin in Anji County, Zhejiang Provinve

作　　者：王金磊[1] 濮励杰[1] 金平华[1] 王宇飞[1] 潘少明[1] 周峰[1] 

机构地区：[1]南京大学城市与资源学系,南京210093

出　　处：《南京大学学报（自然科学版）》2003年第6期788-796,共9页Journal of Nanjing University（Natural Science）

基　　金：中科院知识创新工程项目(KZCX-311);教育部"跨世纪优秀人才培养计划"基金;江苏省"青篮工程中青年学术带头人培养计划"基金

摘　　要：太湖流域水体富营养化、水环境质量下降问题日趋突出 ,而由土壤侵蚀造成的物质迁移是流域非点源营养元素输入的主要载体之一 ,因此 ,流域土壤侵蚀的定量研究具有重要的理论和现实意义 .以太湖上游浙江省安吉县西苕溪流域为例 ,利用137Cs示踪分析方法对该区域的土壤侵蚀数量及空间分布状况作了初步的研究 ,结果表明 :研究区域的137Cs背景值为(2 14 8.8± 12 0 .7)Bq/m2 ;根据建立以及选择的土壤侵蚀和沉积模型计算 ,研究区内非耕作土土壤侵蚀模数平均在 - 431.6t/km2 ·a(“ -”表示堆积 ) ,耕作土土壤侵蚀模数平均在 16 81.2t/(km2 ·a) ,年均土壤侵蚀厚度为 1.5 3mm .研究结论对深入探讨太湖流域上游物质迁移对太湖的生态影响具有基础意义 .The eutrophication and the deterioration of water quality of Taihu Lake become increasingly serious, therefore, the research of the input of nutritive elements of the upper reaches of Taihu Lake and its environmental effects is of theoretical and realistic significance. The substance migration resulting from soil erosion is the main carrier of the non_point nutritive elements into the lake. Taking the representative Xitiaoxi river basin of the upper reaches of Taihu Lake as an example, the amount and space distribution of the soil erosion of this area were researched using ^(137)Cs method in this paper. Based on the sample experiment and the data analysis, the ^(137)Cs reference inventory was determined to be (2 148.8±120.7) Bq/m^2, and according to the quantitative model of soil erosion, the erosion quantity of uncultivated soil is -431.6 (t/(km^2·a),) that of cultivated soil is 1 681.2 (t/(km^2·a),) and the average annual depth of soil erosion is 153 mm. The substance migration from its upper reaches constitute a true ecological impact to Taihu Lake.

关 键 词：^137Cs法 土壤侵蚀模型 土壤侵蚀强度 土地利用方式 西苕溪流域 太湖流域 

分 类 号：S153.1[农业科学—土壤学]