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土壤侵蚀和土地退化,造成了土地生产力下降、河道淤积等一系列问题。利用同位素示踪技术中常用的137Cs和7Be联合对西南干热河谷地区金沙江、澜沧江流域坡耕地土壤侵蚀进行定量研究,为该区域坡耕地土壤侵蚀模数研究提供估算依据。研究表明:在1°～44°坡度范围内,土壤侵蚀模数分布范围为716～7 125.7 t/(km2.a),土壤侵蚀模数与坡度成正相关关系,可使用公式y=193.4x+122.2(R2=0.88,x为坡度,y为土壤侵蚀模数)进行估算。
Soil erosion and land degradation have caused a series of problems such as the decline of land productivity and the river sedimentation. The 137 Cs and 7Be isotope tracing techniques were used to quantitatively study the soil erosion on sloping farmland in the Jinsha River and Lancang River watersheds in the southwest dry and hot valley, which provided the basis for the study on the modulus of soil erosion on sloping farmlands in the region. The results showed that the distribution of soil erosion modulus ranged from 716 to 7125.7 t / (km2.a) in the slope of 1 ° to 44 °, and the soil erosion modulus positively correlated with the slope. The formula y = 193.4x + 122.2 (R2 = 0.88, x is the slope and y is the modulus of soil erosion).