石羊河是甘肃三大内陆河之一,祁连山东段天祝县境内的水源涵养植被是石羊河流域生态系统的主体。区内共有林地面积13.82万公顷,占该区土地总面积的39.14%,森林面积13.27万公顷,活立木总蓄积量740.38万立方米,分别占全县森林总面积和蓄积的56.1%、77%,森林覆盖 Shiyang River is one of the three inland rivers in Gansu. The water conservation vegetation in Tianzhu County, the eastern section of Qilian Mountains, is the main body of the Shiyang River basin ecosystem. A total area of ​​138,200 hectares of forest area, accounting for 39.14% of the total land area of ​​the area, the forest area of ​​132,700 hectares, the total volume of 7,438,000 cubic meters of live stock, accounting for the county’s total area and 56.1% of the total forest area, 77% , Forest cover