三江源自然保护区森林-草甸交错带植物优先保护序列研究

运用系统分析方法和原理，在资料收集和实地调查的基础上，借助专家咨询系统构建了三江源自然保护区森林一草甸交错带植物受威胁等级、优先保护定量分级评价指标体系以及相应的定量评价标准．评价体系包括物种濒危系数、遗传损失系数和利用价值系数3个评价系统层和10个评价指标层．利用专家咨询法和层次分析法，定量确定各个系统层和指标层的权重．通过数学模型和计算机程序计算，分别度量了三江源自然保护区森林．草甸交错带植物物种受威胁状况和优先保护序列状况的濒危系数和优先保护系数；对照植物濒危等级和优先保护序列区域性评价标准，定量评价了植物物种濒危等级和优先保护等级．评价结果表明，三江源自然保护区森林．草甸交错带的种子植物有濒危种4种，脆弱种68种，敏感种179种，安全种695种；该地区种子植物一级保护物种8种，二级保护物种78种，三级保护物种164种。暂缓保护物种696种．最后，针对植物物种优先保护序列评价的指标体系与权重分配问题。物种濒危等级与优先保护序列之间的关系，物种濒危等级评价的空间尺度问题进行了分析和探讨。

Conservation priorities for plant species of forest-meadow ecotone in Sanjiangyuan Nature Reserve

Based on field survey,information collection and experts consultation,the quantitative grading index system and assessment standards for preference conservation of rare and endangered plant species of forest-meadow ecotone in Sanjiangyuan Nature Reserve were established by using the methods and principles of systematical analysis.The quantitative grading index system included endangered coefficient,genetic coefficient,and useful value coefficient.In addition,10 indicators used to evaluate endangered grading and conservation priorities sequenc,were also included in 3 subsystems respectively.Furthermore,the weights of 3 subsystem and 10 indicators were given through experts consultation and analytic hierarchy process.Endangered coefficient and conservation priorities coefficient,which respectively described the endangered grading,and preferential conservation of plant species were calculated by mathematic models and computer program. Contrasting to the standards of endangered grading and conservation priorities for plant species,we quantitatively evaluated the status of endangered and conservation priorities of plant species.The results showed that the number of endangered species was 4,vulnerable species 68,lower risk species 179,safety species 695;the number of the first class species was 8,the second class species 78,the third class species 164,and the delayed conservation species 696.Finally,we discussed the problems of indicator system and its weight,the relationship between endangered grading and conservation priorities sequence,and the spatial scale problem of plant species assessment.