甘南黄河重要水源补给生态功能区生态脆弱性及成因分析

甘南黄河重要水源补给生态功能区地处青藏高原的东北边缘,土地总面积为305.7万hm2,其中草地236.1万hm2,占77.2%,是干旱区生态环境变化的敏感地区。该区曾被誉为"黄河蓄水池"的玛曲湿地趋于干涸,生态环境变得十分脆弱。该文在对甘南黄河重要水源补给生态功能区的生态现状进行了剖析的基础上,依据有关生态脆弱性评价方法,结合天然草地分布的实际状况,建立了生态脆弱性评价体系,对该区的草地生态环境进行了综合评价。结果表明:甘南黄河重要水源补给生态功能区的生态环境均属于中度和强度脆弱范围,并就此分析了原因,以期对生态环境的治理提供参考。

Analysis on Ecological Frangibility and Forming Causes of an Important Water Nourishing Ecological Function Region for the Yellow River in Southern Gansu

Important water nourishing ecological function region for the Yellow River in southern Gansu is located at the northeast edge of Qinghai-Tibet plateau. The total land areas are 3. 057 million hm2,among which about 77. 2% is arid region very sensitive to ecological environment changes. In this region,Maqu wetland eulogized as "Impounding water reservoir of the Yellow River" is tending to become dry up. The ecological environment became very fragile. On the basis of analyze the ecological status of this Region,this paper conducts comprehensive evaluation on its pasture ecological environment according to relevant review method for ecological frangibility com-bining with the real situation of nature pasture distribution,and sets up an evaluation system for ecological frangibility. The results indicate that the ecological environment of this Region belongs to middle and intensive frangibility scope. The paper analyzes its forming causes,so as to provide information for future management of ecological envi-ronment.