兽类学报

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典型草原啮齿动物密度与牧草损失量的关系

李燕妮 袁帅 付和平 武晓东 岳闯 满都呼 杨素文 叶丽娜 王剑然   

  1. 内蒙古农业大学草业与资源环境学院
  • 出版日期:2018-07-30 发布日期:2018-07-18
  • 通讯作者: 武晓东 E-mail:wuxiaodong_hgb@163.com

Relationship of rodent densities with forage loss in typical steppe

LI Yanni, YUAN Shuai, FU Heping, WU Xiaodong, YUE Chuang, MAN Duhu,YANG Suwen, YE Lina, Wang Jianran   

  1. College of Grassland Resources and Environment,Inner Mongolia Agricultural University
  • Online:2018-07-30 Published:2018-07-18

摘要: 研究啮齿动物密度对牧草损失量的关系,对于计算草地经济损害水平至关重要,可以为草地畜牧业管理决策提供指导。本研究于2012 - 2016 年,在锡林郭勒典型草原(东乌珠穆沁旗),应用标志重捕法和样方法对啮齿动物密度以及9 月份植物地上生物量进行调查,用啮齿动物密度及其日食量来估算鼠类对牧草的损害程度,确定牧草损失量。研究结果表明:(1)啮齿动物密度与牧草损失量的最佳拟合曲线是三参数S 型曲线,为:Loss = k/(1+e a - rdensity);(2)当啮齿动物密度>906 个标准鼠单位/hm2 时,牧草产量发生最大损失(牧草产量损失比=23.30% );(3)根据所拟合的曲线,得出该类型草地啮齿动物对牧草损害的危害阈值为174 个标准鼠单位/hm2

关键词: 典型草原, 啮齿动物密度, 牧草损失量, 危害阈值

Abstract: Study of the relationship of rodents density with forage loss is essential both for the calculation of economic injury levels (EIL) and for management decisions. An experiment was conducted to investigate rodent density and aboveground biomass of forage in typical steppe in Inner Mongolia each autumn from 2012 to 2016,. Rodents were live-captured and forage biomass was measured with a quadrat method. Rodent damage was estimated using the density and daily intake of rodents to determine forage loss. The results suggested that: (1) a three-parameter sigmoid curve modeled the relation between rodents density and forage loss, which was better than that of other models, and the formula was: Loss=k/(1+e a-rdensity). (2)The largest forage loss (=23.30%) occurredwhen the rodents density was greater than 906 standard rodent units per hectare. (3) Based on our optimal model, the damage threshold was 174 standard rodent units per hectare in typical steppe.

Key words: Damage threshold, Forage loss, Rodents Density, Typical steppe