中文摘要：

分布于青海云杉林上线的祁连山高山灌丛是祁连山水源涵养林效益最佳林型，研究高山灌丛生物量是生态系统生产力的重要体现，也是群落结构和功能的主要测度之一。以祁连山排露沟流域3300—3700m高山灌丛为研究对象，采用标准地、样方收获法以及壕沟挖掘方法，对不同海拔高度10个固定样地灌丛生物量，器官生物量进行调查，分析了不同海拔梯度灌丛的叶、枝、须根、细根、粗根烘干重数据及其生物量分配特征。结果表明：祁连山高山灌丛总生物量为12869．394-3306．16kg／hm2（平均值±标准差，n=10），其中器官分配以枝生物量所占比例最高，达32．21％，叶、须根、细根、粗根的比例分别为15．70％、14．06％、11．13％和26．90％。不同海拔梯度灌丛生物量器官分配比例差异较大，地上生物量平均为6097．17kg／hm2，地下生物量平均为6772．22kg／hm2，不同海拔根茎比在0．56～1．93之间变化，海拔3500m处根茎比达最大。祁连山高山灌丛生物量与海拔呈现显著的负相关（R2=0．8987，P〈0．01），随着海拔的升高，灌丛总生物量，地上以及地下生物量均呈现下降的趋势。研究结果可为内陆河流域生态环境的保护及其高山灌丛对全球气候变化的响应研究提供重要理论依据和应用资料。

英文摘要：

Qilian Mountains, which sites at the north-east line of the Tibet Plateau ,＇ is the major ecological barrier of the Hexi Corridor and the provinces and regions in the downstream, and its ecosystem is complex and fragile. Under the background of global climate change, the accelerating melting glaciers will influence the global cli- mate, threaten the security of the human living condition and it may change the ecotope and habit of much propa- gation. The alpine shrubs of the Qilian Mountains, which sits beyond the tree line of the Picea crassifolia forest, is the most effective forest type, therefore, to study the biomass of the alpine shrubs in the Qilian Mountains is the main reflection of the productivity of the ecosystem, the main measure of the structure and function of the commu- nity. And because the biomass of the shrubs is impacted by the elevation gradient and environmental factors, in- cluding the limitation of the field investigation in the high altitude, the response process made by shrub biomass to the elevation gradient is not clear. So, this study took the alpine shrubs at the elevation of 3 300 -3 700 m in the Pailugou Catchment of the Qilian Mountains as the research object, the plot, subplot harvesting method and min- ing trenches method were used to observe the total biomass and organic biomass of the shrubs with various eleva- tion gradients and also to analyze the relationship between the distribution characteristics of the shrubs biomassand environmental factors. The aim of this paper is to provide important theoretical basis and data for the protec- tion of ecological environment of watershed and the response of alpine shrub to global climate change. Taking the alpine shrubs above timberline of Picea crassifolia in the Qilian Mountains as a test object, the traditional harves- ting method and mining trenches method were used to observe the alpine shrubs organic biomass. The dry weight data and distribution characteristics of the leaf biomass, shoot biomass, fibrous root biomass, rootlet b