红壤坡地侵蚀定位土芯Eu中子活化示踪研究  

Study of erosion on the neutron activate analysis of the fixed soil core Eu 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 [2]上海市计量测试技术研究院,上海200233

出　　处：《浙江大学学报（农业与生命科学版）》2003年第4期361-367,共7页Journal of Zhejiang University:Agriculture and Life Sciences

基　　金：国家自然科学基金重点资助项目(30030030).

摘　　要：利用野外人工模拟降雨和径流小区观测相结合的方法,研究了Eu定位土芯的布设、取样和分析方法.结果表明,Eu定位土芯中子活化分析技术可以准确测定不同地形、部位土壤侵蚀量.利用Er-Es的经验模型可以描述坡面单位面积流失量的变化趋势,预测坡面土壤流失量,最大误差为7.671t/hm2.不同土地利用方式下坡面泥沙的输移比(SDR)也不相同.顺坡种植作物后,泥沙输移比(SDR)与休闲裸坡地相比减少了30%左右,从而使植被覆盖下坡面泥沙流失减少.The method of setting and sampling of fixed soil core Eu tracer were studied by combination of rainfall simulation and a runoff plot. The result showed that the method of fixed soil core Eu tracer associated with the Instrument Neutron Activate Analysis (INAA) technique could be used to determine soil erosion in different topography site exactly. The tendency of soil loss per area on red soil slope using ErEs experiential model was predicted. The maximum error between the actual soil loss and the result predicted by model was about 6.71　t/hm2. The ratio of sediment transported (SDR) on slope was dependent on land use patterns. Compared with the fallow naked slope, SDR decreased by about thirty percent in land with crops planted in the same direction as slope. The reason of decreased soil loss under condition of vegetation was the reduced SDR.

关 键 词：红壤 坡地 土壤侵蚀 铕定位土芯 中子活化分析 土壤流失 泥沙输移比 同位素示踪 Er-Es模型 

分 类 号：S157.1[农业科学—土壤学]