Determination of ecological thresholds and construction of hazard prediction models for plateau pika Ochotona curzoniae in alpine meadows and alpine steppes
In order to improve the control index of plateau pika Ochotona curzoniae,a combination of unmanned aerial vehicle remote sensing and ground investigation was used to investigate 73 alpine meadow plots and 26 alpine steppe plots. Data were collected on eight monitoring indicators,including the ratio of bare patch,aboveground biomass,number of effective burrows,community height,species richness,proportion of edible forage,Shannon-Wiener diversity index and Pielou evenness index. The ecological thresholds of plateau pikas in two grassland types were determined by analyzing the relation-ship between the number of effective burrows of plateau pikas and other indicators,excluding the pro-portion of edible forage. The rodent damage index was calculated using the data of eight indicators,and the damage grades were categorized according to the rodent damage index. The damage prediction mod-els for plateau pikas in both grassland types were constructed by stepwise regression. The results showed that in the alpine meadow area,the ecological thresholds for plateau pikas were 613 effective burrows per hectare,a bare patch rate of 13％,and an aboveground biomass of 160 g/m2. The key fac-tors for predicting the damage of plateau pikas in the alpine meadow area were the number of effective burrows,the bare patch rate and the aboveground biomass;in the alpine steppe area,the ecological thresholds of plateau pikas were 205 effective burrows per hectare,a community height of 3 cm,and a species richness of eight species. The key factors for predicting the damage of plateau pikas in the al-pine steppe were the number of effective burrows,the community height and species richness.
万方数据
维普
