红壤坡地土壤侵蚀定位土芯Eu示踪方法研究  

Study on Neutron Activate Analysis Method of Fixed Soil Core Tracer on Red Soil Slope

作　　者：马琨[1] 王兆骞[1] 陈欣[1] 眭国平[2] 杨遂平[2] 

机构地区：[1]浙江大学农业生态研究所,杭州310029 [2]上海市计量测试技术研究院,上海200233

出　　处：《水土保持学报》2002年第4期21-24,共4页Journal of Soil and Water Conservation

基　　金：国家自然科学基金重点项目资助(30030030)

摘　　要：利用人工模拟降雨装置和径流小区观测法相结合,详细阐述了Eu定位土芯的布设、取样及分析方法。试验研究结果表明,Eu定位土芯中子活化分析技术可以准确地测定不同地形部位的土壤侵蚀量。坡面侵蚀泥沙的分布表现为沉积、侵蚀交错出现,呈现波形变动,符合多项式的变化,相关关系也较好。休闲裸坡地上,整个坡面大都表现出上坡的上中部为侵蚀运移,下坡为沉积。布样80d后,发现测定流失泥沙结果与模型拟合结果的相关关系较好,准确度也较高。因此建议一般应在Eu土芯布样3个月后取样为好。预测结果和实际情况也比较相近,最大误差为7.671t/hm2,取样误差为1mm。The method of setting and sampling of fixed soil core Eu tracer is discussed by means of the rainfall simulator in combination with a runoff plot as the tool. The result showed that the method of fixed soil core Eu tracer associated with the INAA technique could be used to determine exactly soil erosion of the different topography. We found the tendency of soil erosion and sediment distribution were interleave, in waves. The change in the distribution of soil erosion had a polynomial relation, correlation index had a slightly higher. Sediment deposition occurred mainly at the bottom of the slope, whereas the top and middle parts of the slope mainly experienced soil loss. There was a good correlation relation between the actual soil loss and the soil loss as for a period of 80 days. So we concluded that it is better to sample the fixed soil core over a period of 80 days .The error between the actual soil loss and the result predicted by our model was about 6.71 t/hm2, which is equal to 1 mm error in the fixed soil core.

关 键 词：红壤坡地 土壤侵蚀 定位土芯Eu示踪方法 中子活化分析 

分 类 号：S157.1[农业科学—土壤学]