河西走廊北部荒漠草地长爪沙鼠防治指标研究

长爪沙鼠是河西走廊北部荒漠草地的优势鼠类，危害严重。古浪县位于河西走廊东部，北部荒漠草地的长爪沙鼠，5月鼠密度在29．1只／hm^2～52．3只／hm^2之间，至9月造成牧草损失586kg／hm^2。通过调查鼠密度和牧草损失量，结果充分显示长爪沙鼠的种群密度与其造成的损失量之间呈明显的正相关关系，其回归方程式为：M=13．96×-8．10。通过防治及综合分析研究后提出在河西走廊的古浪县北部荒漠草地长爪沙鼠的防治指标为5．33只／hm^2，5月份防治。

Research on Control Index of the Mongolian Gerbil in Northern Desert-steppe of Hexi Corridor

The dominant species of rodent is the Mongolian gerbil in northern desert-steppe of Hexi Corridor, which causes serious damage. Gulang County located in eastern Hexi Corridor, the density of Mongolian gerbil is 29.1-52.3 per hectare of the northern desert-steppe in May, and to September the forage loss is 586 kg/hm^2. Through investigating the rat density and forage loss, the results showed that there＇s a positive correlation between population density and forage loss of the Mongolian gerbil, the regression equation was M= 13.96 ×-8.10. By integrated analysis and studied, this paper points out that the control index of Mongolian gerbil is 5.33 per hectare in northern desert-steppe of Gulang, and the control time is in May.