中文摘要：

针对黑河流域草原生态环境的特点，基于P—S—R模型，采用物元可拓理论和熵权法构建了草原生态安全综合评判模型，对黑河流域各县区草原生态安全进行了评价。结果表明：自黑河上游至下游，生态安全状况依次降低。肃南县和祁连县草原生态安全；民乐县和高台县较安全；山丹县稍不安全；肃州区、甘州区和嘉峪关市不安全；金塔县、临泽县和额济纳旗极不安全。各县区对不同因子的敏感程度也各不相同。图2，表4，参8。

英文摘要：

Focusing on the characteristics of regional grassland eco-environment and main eco-problems of Heihe River basin, an integrated assessment model was constructed to assess the grassland ecological security in Heihe River basin with the support of entropy weight,matter-element model and extension engineering theory. The results indicated that the grassland ecological security status was greatly degenerated from the upper to the lower reaches of Heihe River. Among the eleven counties, Sunan and Qilian Counties had the least insecurity, Minle and Gaotai Counties were in the second place, however, Jinta, Linze and Ejina Counties had the highest insecurity. Different counties had different sensibility to the environmental factors. The results of this assessment were in good correspondence to the regional actual situations, indicating that matter-dement model was applicable in this field.