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甘肃省定西地区,是一个干旱少雨、水土流失严重的贫困山区,年均降雨量421.l毫米,60%的降雨集中在7～9月,且多以暴雨形式降落。因植被稀疏,土地利
The Dingxi area in Gansu Province is a poor mountainous area with arid and rain-prone soil erosion. The average annual rainfall is 421.lmm. 60% of the rainfall is concentrated in July-September, and it mostly falls in heavy rainfall. Due to sparse vegetation, land and Lee