蜂桶寨自然保护区小熊猫对生境的选择

Habitat Selection by Red Pandas in Fengtongzhai Natural Reserve

2002年4月至11月,在邛崃山系宝兴蜂桶寨自然保护区设点,应用资源选择函数和资源选择指数研究了小熊猫对生境的选择和利用。结果表明,影响小熊猫生境选择的关键因子是水源距离、竹子基径、灌木密度;次关键因子是坡位、树桩密度、倒木密度;次要因子是坡向、乔木密度;而郁闭度、坡度、植被类型、乔木高度、灌木高度、树桩高度、树洞密度、人为干扰的影响不明显。小熊猫喜欢在水源较近(<250m)、竹子长势良好(基径大于4 0mm)、灌木和乔木密度大(大于1 5株 20m2)、树桩和倒木数量多(>1根 400m2)、中上坡位、南坡的针叶林或针阔混交林活动。小熊猫的生境资源选择函数为:logit(P)=-13 527-3 180×水源距离+2 702×竹子基径+2 582×灌木密度+2 134×树桩密度+2 104×坡位+1 622×倒木密度-1 066×坡向+0 934×乔木密度……小熊猫对生境的选择概率为:P=elogit(P) (1+elogit(P))

From April to November,2002, we studied the habitat selection of red pandas by using Resource Selection Functions and Resource Selection Index in Fengtongzhai Natural Reserve, Qionglai Mountains. The results indicated that the key factors notably influenced on habitat selection were the water source, bamboo basal diameter and shrub density. The secondary key factors were the slope position, tree stump density and fallen log density. The secondary factors were the slope aspect and tree density. The random factors were the canopy, slope degree, vegetation type, tree height, shrub height, tree stump height, tree hole density and human disturbance. Red pandas preferred to select the coniferous forest and broad-leaved coniferous forest located in the middle or the higher parts of the hillside in our study area with water source close by (<250 m), finer bamboo growth (basal diameter>4.0mm), higher density of tree and shrub (>1.5 culms/20 m^2) and abundant tree stumps and fallen logs. The red panda preferred to choose habitats with a southward aspect. Resource selection functions is a log-linear model: logit(P)=-13.527-3.180×water distance + 2.702×bamboo basal diameter + 2.582×shrub density + 2.134×tree stump density + 2.104×slope position + 1.622×fallen log density-1.066×slope aspect + 0.934×tree density…… From this model, we can estimate a habitat selection probability:P=e^(logit (P)) / (1+e^(logit(P)))