基于斑块尺度的神农架川金丝猴生境适宜性评价

基于斑块尺度的生境适宜性研究,可以通过物种分布的景观格局特征,推导出研究区的景观适宜性,有利于景观规划决策。研究首先分析农业用地对神农架川金丝干扰的阈值,其次采用泊松回归构建基于斑块尺度的包含植被类型、斑块特征和人为干扰特征的猴群分布模型,依据模型结果叠加道路适宜性分级图对川金丝猴适宜生境进行评价。结果显示:(1)农业用地干扰阈值为2000 m;(2)最优模型显示猴群偏好面积大、形状简单的寒温性针叶林、寒温性针叶-落叶阔叶混交林、温性针叶-落叶阔叶混交林斑块,对农业用地具有回避性;(3)道路干扰已成为川金丝猴迁移的主要障碍,川金丝猴分布区受到的农业干扰较小,但其成为阻碍川金丝猴扩张分布区的屏障。建议神农架保护区全面开展道路与旅游景点对野生动物干扰的监测。

Evaluation of habitat suitability based on patches of the Sichuan snub-nosed monkey (Rhinopithecus roxellana) in Shennongjia, Hubei Province

Based on patch level, the habitat suitability of a study area can be deduced by the landscape pattern of species distribution, which is crucial to landscape planning decisions. This study investigated the habitat suitability for the Sichuan snub-nosed monkey (Rhinopithecus roxellana) in Shennongjia, Hubei Province. First, the disturbance threshold of the agricultural land was analyzed. Then, Poisson regression was used to construct the monkey distribution model based on the patch scale, with vegetation types, patch characteristics, and human disturbance characteristics as variables. The model of the results was combined with the road suitability map to estimate the monkeys'' suitable habitat distribution. The results showed that (1) the disturbance threshold of agricultural land was 2000 m; (2) the optimal model revealed that the monkeys preferred large and simple-shaped patches with cold-temperate coniferous forest, cold-temperate coniferous-deciduous broad-leaved mixed forest, and temperate coniferous-deciduous broad-leaved mixed forest vegetation types, and avoided agricultural land; (3) the road has become a major obstacle to dispersal. The distribution of R. roxellana was less disturbed by agriculture, which was also a barrier to the expansion of the distribution area. It is suggested that the Shennongjia reserve should carry out monitoring of the disturbance of wild animals by road activity and tourism.