石羊河下游干旱荒漠区植物优先保护级别研究

Evaluation of Conservation Priority Classes of Plant Species in the Lower Reaches of Shiyang River

在对石羊河下游干旱荒漠区实地调查的基础上,以2014-2016年野外调查数据为基础,结合文献研究资料,运用数量方法研究了石羊河下游干旱荒漠区野生植物的濒临消失风险和优先保护级别。以样线分布频度、样地分布频度、现存多度、分布方式和确限度5项指标,对该区域植物濒临消失程度进行定量评价。结果表明,石羊河下游干旱荒漠区有极易消失种7种,容易消失种9种,可能消失种10种,其余252种为安全种。利用濒临消失风险指数、遗传损失指数和利用价值指数3个指数,对该区域各植物物种的优先保护顺序进行综合评定,划分了保护级别,由此确定了石羊河下游干旱荒漠区一级优先保护植物有10种,二级优先保护植物有18种,非保护植物共250种。

This paper mainly studied the extinction risk and the classes of conservation priority of wild plants in the lower reaches of Shiyang River by using quantitative methods, based on field investigation from 2014 to 2016, as well as literature consulting. The degree of endangerment was evaluated quantitative ly by 5 indices： distribution frequency of line-transect, distribution frequency of sample plot,existent abun- dance, distribution mode, and exclusiveness. The results showed that there were 7 endangered species, 9 vulnerable species, 10 near threatened species and 252 safe species in the lower reaches of Shiyang River. A comprehensive evaluation was carried out on the order of priority for conservation of plant species by en dangerment index,genetic loss index and utility value index. Ten species were the first rank for protection, 18 were in the second rank,and 250 were non-protection species.