摘要
研究结果显示,地上植物量、植被盖度、破坏的生草面积、绝对鼠密度和有效洞口数之间均具有较高的相异性,但各自都从不同侧面反映了高原鼠兔的危害程度;5项研究指标的综合影响是评估危害程度的真实反映;植被害情是评价危害程度的主要因子,鼠密度是次要因子;将危害程度划分为4个级别,提出了划分危害级别的量化指标。不同指标值在各危害级别中的排序是,鼠密度:Ⅳ<Ⅰ<Ⅱ<Ⅲ;有效洞口数:Ⅳ<Ⅰ<Ⅱ<Ⅲ;破坏的生草面积:Ⅰ<Ⅱ<Ⅲ<Ⅳ;植被覆盖度:Ⅳ<Ⅲ<Ⅱ<Ⅰ;地上植物量:Ⅳ<Ⅲ<Ⅱ<Ⅰ;单纯以鼠密度划分危害级别或评估危害程度的方法是不正确的。
An integrated evaluation system based on five indictors （ground biomass, vegetation cover, damaged grassland area, rodent population density and available rodent holes） could accurately evaluate the harm done by rodents on the Plateau Pika. The major indicator is amount of vegetation damage and the secondary indictor is rodent population density. The ranking of different indictors of harm is. Rodentpopulation density, available rodent holes, area of damaged grassland, vegetation cover, and ground biomass. Rodent population density alone is not an accurate indicator of harm done to plateaiu vegetation.
出处
《草业学报》
CSCD
2008年第5期130-137,共8页
Acta Prataculturae Sinica
基金
世界银行/全球环境基金项目(052456CHA)资助
关键词
高原鼠兔
草原鼠害
危害级别
plateau pika
grassland rodent harm
harm degree
