^(137)Cs在坡耕地中的分布特征及土壤侵蚀中的应用  

Distribution of ^(137)Cs in Slope Farmland and Its Application in Soil Erosion

作　　者：王小雷[1,2] 杨浩[2] 

机构地区：[1]南京晓庄学院生物化工与环境工程学院,南京211171 [2]南京师范大学地理科学学院,南京210023

出　　处：《湖北农业科学》2014年第19期4555-4559,共5页Hubei Agricultural Sciences

基　　金：国家自然科学基金项目(41203087;41030751);江苏省高校"青蓝工程"优秀青年骨干教师培训对象项目(2154022);南京晓庄学院青年专项基金项目(2011NXY67)

摘　　要：选择一块长为31.5 m,宽为11.0 m,平均坡度为15.8°的矩形坡耕地作为研究对象,分别采集分层样和全样土壤样品,对土壤中的137Cs进行测试分析。结果表明,137Cs在此研究区的背景值为918 Bq/m2,受采样方式和测试仪器本身参数影响,其测定值与前人研究结果相比略有差异;137Cs在分层样和全样土壤中的分布特征均呈现自坡顶至坡底逐渐增加的趋势,表明坡耕地不同部位的土壤侵蚀大小依次为坡顶部>坡中部>坡底部。运用137 Cs示踪模型估算坡耕地的平均土壤侵蚀量为3793 t/(km2·a),属于中度侵蚀等级。A slope farmland with an area of 31.5 m ×11.0 m and an average gradient of 15.8° were selected to collect the incremental depth cores and bulk cores and analyzed the activities of137 Cs in soils.The results showed that the reference inventory of137 Cs was 918 Bq/m^2,different from previous report due to the difference between soil sampling patterns and laboratory instrument.The activities and inventories of137 Cs in soils showed an increasing trend from summit to toe,and the order of soil erosion rates was summitmiddle-slopetoe.Based on the models of137 Cs,the soil erosion rates in this slope farmland were evaluated as 3 793 t/（km^2·a）,which was a moderate grade of erosion.

关 键 词：^137CS 分布特征 坡耕地 侵蚀速率 

分 类 号：S124.2[农业科学—农业基础科学]