摘要
本研究基于RUSLE模型,收集了气象、地形、植被、土壤等资料,定量评估了1990-2005年内蒙古兴安盟地区土壤侵蚀变化,并进一步分析了其驱动因子。结果显示:该区总体上为土壤轻度侵蚀,东部和南部地区土壤侵蚀模数较高,北部和中部地区较低。1990年该区土壤侵蚀模数最高,为9.15t/(hm2·a),2005年下降为2.38t/(hm2·a),其下降过程主要受降雨侵蚀力和植被覆盖因子共同影响。1990-2005年研究区各海拔区间土壤侵蚀模数均呈下降趋势,至2005年仅有0-400m区间土壤侵蚀强度仍为轻度侵蚀以上。1990-2005年各土地利用类型土壤侵蚀模数均呈下降趋势,沙地与盐碱地下降幅度最小,草地侵蚀强度仍然为轻度侵蚀。
In this article, based on the RUSLE equation, we used meteorological observation data, terrain data, vegetation and soil data, to quantitatively assess the soil erosion modulus and changes in Hinggan League, Inner Mongolia from 1990 to 2005. Then we also analyzed the soil erosion rate variation with altitude and land use type changes was light and the driving in most area of factors of soil erosion modulus change The results showed that the soil erosion degree Hinggan League. The soil erosion rate was high in eastern and southern, and low in northern and central Hinggan League. In 1990, the soil erosion modulus of Hinggan League was the highest, 9. 15t/（hm^2· a）, and it decreased to 2.38t/（hm^2· a） in 2005. This procedure was mainly influenced by com- bined rainfall erosivity and vegetation coverage. From 1990 to 2005 all elevation interval showed downtrend for soil erosion modulus. By 2005, only the elevation between 0 and 400 meters owned soil erosion modulus above light degree. From 1990 to 2005 all land use types showed downtrend for soil erosion modulus. Among them the sand, saline and alkaline land owned the smallest extent of downtrend. In 2005 the soil erosion intensity of the grassland was remain light erosion, and the annual soil loss was still the largest. So the regions with altitude interval below 400 meters or sand, saline and alkaline land, grassland were the key management area for future water and soil conservation work in the research area.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2014年第6期124-129,共6页
Journal of Arid Land Resources and Environment
基金
环保公益性行业科研专项项目(201209031)资助
