Plateau Pika Population Survey and its Control Threshold in the Alpine Meadow Ecosystems of the Tibetan Plateau
Understanding the roles of plateau pikas (Ochotona curzoniae
) on grassland degradation is essential for improving the management of pika populations in alpine meadow ecosystem. In this study, 4 degrees of active burrows densities from 12 survey sites were defined to evaluate the interactions between pika populations and biomass changes. We conclude that pika activities may not be the cause but act as a symptom of grassland degradation, and the high-frequency of pika activities can promote to the process of reverse succession. Therefore, some comprehensive measures such as reduction of livestock numbers, variable grazing system, restorative management techniques, and community participation in co-management of the meadows are likely to effectively improve grassland productivity and prevent the outbreaks of pikas. Furthermore, pika population fluctuations should be monitored. When the population of pikas exceeds the economic threshold or reaches high-density, integrated management strategies should be implemented to prevent damage.
2016,35(6): 825-832 收稿日期：2016-04-05
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