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此项观察结果表明,1981年8月下旬于祁连山北坡草原地带1000公顷灭獭区内,以人工杀灭方法将喜马拉雅旱獭(Marmota himalayana)的原有密度每公顷1.03只降低到0.06只后,1982年秋季其密度便恢复到0.36只,以后密度逐年上升,至1984年秋季上升到1.0只,已经基本恢复到原有的密度。 灭獭后其密度的恢复,前二年主要是区外旱獭的迁入,以后主要是区内旱獭的繁殖。同时可见,灭獭区旱獭种群密度的恢复速度与最初迁入的旱獭数量多少,以及灭獭区面积的大小有关。
The observation shows that in late August 1981 in the area of 1000 hectares of grassland in the northern slope of Qilian Mountains, the original density of Marmota himalayana was reduced to 1.06 per hectare to 0.06 by artificial killing method. In autumn 1982, the density returned to 0.36. Afterwards, the density increased year by year and rose to 1.0 by the fall of 1984, which has basically returned to its original density. After otter the density of the restoration, the first two years is mainly outside the marmot immigrants, after mainly the region’s marmot breeding. At the same time, the recovery rate of woodchuck population density in otter area is related to the number of woodchucks initially moved in and the size of the otter area.