运用1 37Cs示踪法对长江上游“长治”水土保持工程重点治理区的云贵高原区、川中丘陵区和三峡库区 8块紫色土坡耕地土壤侵蚀速率研究结果表明 ,影响紫色土坡耕地平均侵蚀速率的主要因子为坡度、坡长、降雨量和土壤粒度组成 ,四个研究区土壤平均侵蚀速率介于 75 8t km2 ·a- 1 ～ 985 4t km2 ·a- 1 ,计算值与长江上游类似地区径流试验场观测值基本一致。

The upper Yangtze River is one of the most severely eroded areas in China. The purple Cultivated slope land is one of the important sources for river sediment in the mountain regions. The paper reports the results of a preliminary investigation of the potential of using 137 Cs measurements on a purple sloping cultivated land in the upper Yangtze River. Soil samples were mainly collected from the purple cultivated slope land, and the 137Cs reference samples collected from a plain grassland or terraced land where no disturbance sine 1953. The references inventory of 137Cs in sampling region are between 919.8 Bq/m² and The effective references inventory of 137Cs in sampling region are between 643.9 Bq/m² and 1425.1 Bq/m². The soil erosion rates of the purple cultivated slope land of sampling sites are from 758 t/km²·a^-1 to 9854 t/km²·a^-1.