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一 三峰小流域位于吉林省延边朝鲜族自治州龙井县朝阳乡境内,属图们江水系,境内有大小沟壑46条,沟壑密度每平方公里3.5公里。 该小流域是以砂岩为主的白垩纪地层,土壤种类以暗灰棕壤为主,土壤中含N量偏低,含P量中等,含K量较丰富。气候条件较好,属于寒温带大陆性湿润季风气候区,春季风大而干燥,夏季温热多雨。无霜期为130天左右,多年平均年降雨量为570mm,60～70％的降水集中在6～8月,积温(5～9月)为2700度。多年
A Sanfeng Small Watershed is located in the territory of Chaoyang Township, Longjing County, Yanbian Korean Autonomous Prefecture, Jilin Province. It belongs to the Tumen River system. There are 46 large and small gully areas in the territory, and the gully density is 3.5 kilometers per square kilometer. The small watershed is a sandstone-dominated Cretaceous. The soil type is dominated by dark gray-brown soil. The content of N in soil is low, the content of P is medium and the content of K is relatively abundant. Climatic conditions are better, belonging to the temperate continental humid monsoon climate zone, the spring monsoon is big and dry, the summer is warm and rainy. Frost-free period of about 130 days, annual average annual rainfall of 570mm, 60 ~ 70% of the precipitation concentrated in June to August, accumulated temperature (May to September) of 2700 degrees. for many years