祁连山山地生态系统稳定性评估模型

通过建立祁连山山地生态系统稳定性评价指标体系和利用AHP法确定各评价指标权重，构建该地区山地生态稳定性综合评价模型。研究表明，水资源开发强度、植被覆盖度、地面坡度、生物多样性指数和自然保护区面积比重对祁连山山地生态系统稳定性贡献率较大，合理开发利用水资源、提高植被覆盖度、保护生物多样性和适当扩大自然保护区面积，是维护该区生态平衡、增强生态系统稳定性的重要措施。

Study on the Assessing Model of Stability of the Mountainous Ecosystem in the Qilian Mountain

The mountainous ecosystem in the Qilian Mountain is a complicated spatial composition of the life system and the environment system under the peculiar ecological, geographical and environmental backgrounds, and it is vulnerable. The Qilian Mountain is an important place where the water resources of the Hexi Corridor, Gansu Province, are formed, so the stability of its ecosystem is closely related to the existence and development of the oases in the Hexi Corridor. In this paper, the assessing model of stability of the mountainous ecosystem in the Qilian Mountain is developed based on the assessment indexes and their weights. The study results show that the contributions of the utilization degree of water resources, vegetation coverage, slope, biodiversity index and the proportion of area of the nature reserves are high to the stability of the mountainous ecosystem in the Qilian Mountain. It is the important measures for maintaining the ecological balance and increasing the stability of the mountainous ecosystem to rationally exploit and utilize the water resources, increase the vegetation coverage, protect the biodiversity and properly enlarge the area of the nature reserves.