山丹县

甘肃省山丹县种羊场放牧绵羊体内的矿物元素检测

Measurement of mineral elements in grazing ewes on Shandan county breeding sheep farm in Gansu Province

在山丹县内，生态健康的值相对较高的是山丹军马场草场，这里的植被是覆盖度高，且大面积连成一片；

During each year in Shandan County , relative high values of ecosystem health exist at military horse farm , where the high overlay grassland is dominating ;

黑河中上游典型地区草地植被变化及其生态功能损失分析&以山丹县为例

Variation and Ecological Function Loss of Grassland Vegetations in Typical Regions in the Upper Reaches of Heihe River & A Case of Shandan County in the Upper-middle Reaches of Heihe Basin

结果表明：山丹县草地近年来生态健康的状况总体显著下降，1990年所有栅格的平均健康值为0.0572，而到了1999年下降为0.0322，下降幅度达到43.7%；

The results show that the ecosystem health in Shandan County degraded remarkably , mean health index of all grids was 0.057 2 in 1990 , while 0.032 2 in 1999 , declining 43.7 % ;

研究以甘肃省山丹县作为干旱半干旱典型研究区，选择压力、活力、反弹力作为生态系统健康模型的3个诊断指标，建立干旱半干旱区地区生态系统健康模型。

In this paper , Shandan County in Gansu Province was selected as a typical study region in arid and semi arid areas . The pressure , vigor and resilience were selected as three indicators for modeling ecosystem health diagnoses .