Based on the biodiversity characteristicsw in the Three Rivers Headstream Region, we calculated the irreplaceability values in conservation planning units of the region by using GIS and C-Plan conservation planning software under the framework of systematic conservation planning ( SCP) methods, and further calculated the contributions of the existing Nature Reserve in the Three Rivers Headstream, analyzed the complementarity of main protected object between any two subareas and efficiency of each zone, and identified conservation gaps in the study area with the calculated irreplaceability values. The nature reserve contribution assessment showed that the existing two main protected areas covered all the surrogates identified in this study, and protected 80% of the surrogates that the conservation target planned to do. The high irreplaceability areas roughly corresponded to the core zones of the existing nature reserves in their spatial distribution. The contributions of core zones, core zones + buffer zones,and core zones + buffer zones + experiment zones were 61.20% , 77. 57% and 91. 20% , respectively. Core zones in six subareas of the Three Rivers Headstream Nature Reserve were highly complementary, suggesting that the core zone classification was reasonable and the identification of main protected objects was obvious. CAP analysis indicated that 8. 08% of the total targets were not yet fulfilled and 20% of the surrogates were underrepresented, including one ecosystem type and 7 species. The gaps were mainly distributed in Tanggula region characterized by lakes, glaciers, snow mountains and alpine meadows, Yuegai-Bagan region with alpine meadows as main vegetation type, Zeku-Henan alpine shrub and meadow region, and Longbao-Laxiu forest and shrub region.%根据三江源生物多样性特征,在系统保护规划方法(SCP)框架下,利用地理信息系统(GIS)技术与保护规划软件C -Plan,计算三江源区域内各规划单元的不可替代性值及已建自然保护区对该地区生物多样性保护的贡献率,评估三江源地区现有保护区的保护贡献,分析分区间主要保护对象的互补性及各区保护效率,在此基础上分析该地区现有保护区的保护空缺.贡献率评估结果显示:三江源地区现有的2个最重要的保护区,可可西里自然保护区和三江源自然保护区(包含6个区域)基本涵盖本研究确定的所有保护对象,已经达到保护目标的保护对象占其总数量的80％；不可替代性高的区域与现有保护区核心区在空间分布上基本吻合,其贡献率达到61.20％,核心区+缓冲区贡献率为77.57％,核心区+缓冲区+实验区总贡献率达到91.20％；可可西里自然保护区及兰江源自然保护区6大区域内核心区间的互补性较高,说明核心区区域的划分较为合理,主要保护对象类型区分较为明显.空缺分析显示:在三江源地区现有保护区体系下,还有8.80％的保护目标没有实现,未达到保护目标的保护对象占保护对象总数的20％,其中包括生态系统类型1种,动植物物种7种,保护空缺主要分布在唐古拉湖泊、冰川雪山及高寒草甸区,约改-巴干高寒草原区,泽库-河南高寒灌丛草甸区与隆宝-拉秀森林灌丛区等4个区域.
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