赤腹松鼠（Callosciurus erythralus）春季生境特征初步分析

2009年2月至5月,在广西龙江河畔对赤腹松鼠（C.erythralus）的春季生境特征进行了分析.野外共测量了57个10m×10m样方中的13个生态因子,并运用频次分析和主成分分析的方法,对赤腹松鼠的春季生境选择因子进行了分析.结果表明,赤腹松鼠春季生境的主要特征为：郁闭度良好,水源距离＜30m,坡度20～40°,避风性良好,坡向以东坡和南坡为主,坡位中坡位或上坡位,食物因子良好,人为干扰距离＜10m,海拔50～100m,乔木密度＜50株,乔木距离低于4m,灌木密度低于200株,灌木距离＜2m.影响赤腹松鼠春季生境选择的主要因子为郁闭度、避风性、坡度、坡位和灌木距离;次要因子为海拔、人为干扰距离、乔木距离、水源距离、乔木密度、灌木密度、食物丰富度、坡向.

Preliminary analysis on the habitat character of red bellied tree squirrel(Callosciurus erythralus)in Spring

Habitat characteristics of the red bellied tree squirrel （ C. erythralus） were investigated from February to May 2009 in Long Yangtze Riverside, Guangxi. Thirteen ecological factors （ canopy density, water distance, slope, shelter of wind, aspect, slope posi- tlon, elevation, tree density, shrub density, distance of tree, distance of shrub, distance to human disturbance and food abundant） were recorded in each of 10m × lore plots 0f57 samples. The collected data were analyzed using frequency analysis and principle component analysis. The results showed that the habitat of red bellied tree squirrel shared the following characteristics： habitat with well canopy density closes to water （ less than 30m）, it was built along the slope between 20 degree to 40 degree toward east or south with well shelter of wind, the slope position was selected from middle to uphill ; the habitat where human disturbance distance was less than 10m was of well food richness, its elevation was about 50m to 100m, tree density was less than 50, shrub density less than 200, the distance to tree was less than 4m, and the distance to shrubs was less than 2m. There were five main factors （ canopy density, shelter of wind, slope, slope position and distance of shrubs） and eight secondary factors （ water distance, aspect, slope position, tree density, shrub density, distance of tree, distance to human disturbance and food richness） affecting the habitat selection of red bellied tree squirrel in spring.