低数量期布氏田鼠在不同季节中对生境的选择及影响因素的研究

布氏田鼠(Microtus brandti Radde)是近年来国内外研究报道较多的鼠种之一。内蒙古锡林郭勒盟卫生防疫站(1975)、罗泽(日旬)等(1975)、黑龙江草原灭鼠办公室(1976)、刘书润(1979)、ДMиTpиeB(1980)、钟文勤等(1985)均从不同角度报道了该鼠选择生境的生态习性和数量分布特点。在前人工作的基础上,本文着重研究了布氏田鼠在低数量期对生境的选择及主要生态因子的影响。

STUDIES ON SELECTING HABITATS OF BRANDT'S VOLES IN VARIOUS SEASONS DURING A POPULATION LOW

An investigation on Brandt's voles(Microtus brandti Radde)during a population low was made at Amugulong, Inner Mongolia from Sept. to Oct., 1983 and from Apr.to Sept., 1984.It dealt with the characteristics of habitats the vole selected and the effect of the main ecological factors.Eight types of habitats were selected on an area of about 20km² for studying the density of the vole.The numbers of its burrow openings were counted every month to analyse tha variation of density in different habitats and seasons. It was shown that the shallow ditch with a sedge (Carex duriuscula)grassland was the optimal habitat for the voles.Some ecological factors affecting the density of the voles were analysed. They were topography,grassland type,height of herbosa,moisture content of plant,coverage of vegetation,productivity of grassland,soil moisture and soil hardness,etc.The stepwise regression was used to analyse the comprehensive factors in various seasons. Results show that topography, food sources and the height of herbosa are correlated to the selecting of habitats by Brandt's voles.