【摘要】 采用样地法和样线法,对湖北省保康县五道峡国家级自然保护区的珍稀濒危保护植物的资源状况和分布特征进行了调查。运用濒危系数、遗传价值系数和物种价值系数3个组合指标和11个二级指标,计算出综合评价值,以此来确定保护区内珍稀濒危保护植物优化保护等级。结果表明,保护区内共有珍稀濒危保护植物43种,其中濒危物种16种,稀少物种23种,安全物种4种;属于一级优先保护物种有10种,二级19种,三级11种,四级3种,其结果与国家所确定的保护植物的保护等级并不完全相同。通过对珍稀濒危保护植物分布特征的分析发现,在800～1 600 m海拔段,珍稀濒危保护植物种类最多且特有性高,占保护区珍稀濒危保护植物总种数的72.09%,是保护区珍稀濒危保护植物分布的集中区域;高海拔段(1 600 m以上)分布有较多的珍稀濒危保护植物群落,原生性明显,具有非常重要的保护价值。更多还原

【Abstract】 The resource status and distribution characteristics of the rare and endangered plants in Wudaoxia National Nature Reserve of Hubei Province were investigated based on sample plots and line transects.The comprehensive evaluation value was calculated by 3 combined indicators of threatened coefficient,genetic value coefficient and species value coefficient, and 11 secondary indicators to determine the optimal protection grade of rare and endangered protected plants in the reserve.The results showed that there were 43 species of rare and endangered plants in the reserve,including 16 species of endangered species,23 species of rare species and 4 species of safe species,among which,10 species were reranked as the first grade for conservation priority,19 species were re-ranked as the second grade,11 species were re-ranked as the third grade,and 3 species were re-ranked as the fourth grade,which were not identical with the grade of protected plants determined by the state. The analysis for the distribution characteristics of the rare and endangered plants found that the species were the most abundant and highly endemic at the altitude of 800 ～ 1600 m,accounting for 72. 09% of the total species in the reserve,which was the concentrated area for the distribution of rare and endangered plants. The distribution of rare and endangered plant communities were more in the high altitude section( above 1600 m),which had obvious primitiveness and important protection value.更多还原