白水江自然保护区两栖、爬行动物物种丰富度的海拔梯度格局的解释:水分能量动态假设和生境异质性假设  

Explanation of elevational patterns of amphibian and reptile species richness in the Baishuijiang Nature Reserve: Water-energy dynamic hypothesis and habitat heterogeneity hypothesis

作　　者：郑智[1] 龚大洁[1] 张乾[2] 

机构地区：[1]西北师范大学生命科学学院,兰州730070 [2]西北师范大学地理与环境科学学院,兰州730070

出　　处：《生态学杂志》2014年第12期3332-3338,共7页Chinese Journal of Ecology

基　　金：国家环境保护部秦岭地区野生动物物种资源评估项目(201212)资助

摘　　要：采用线性回归模型和方差分离方法,利用水分能量动态假设和栖息地异质性假设解释了白水江自然保护区两栖、爬行动物物种丰富度的海拔分布格局。水分能量动态假设对白水江自然保护区两栖爬行动物物种丰富度的海拔分布格局的解释力较强,同时,水分能量动态假设和栖息地异质性假设之间存在着较强的共线性。年均降水量(PAN)进入了两栖动物物种丰富度海拔分布格局的最优线性回归模型,未进入爬行动物物种丰富度海拔分布格局的最优线性回归模型,但潜在蒸散量(PET)及其二次方(PET2)全部进入了爬行动物的最优线性回归模型,说明水分对两栖动物的重要性和温度对爬行动物的重要性。方差分离结果表明,栖息地异质性假设对两栖、爬行动物物种丰富度海拔分布格局的独立解释力较低,而水分能量动态假设的独立解释力较高。对于广域种,可能受到边界限制的影响,水分能量动态假设和栖息地异质性的解释力并不高。Water-energy dynamic hypothesis and habitat heterogeneity hypothesis were used to explain elevational patterns of amphibian and reptile species richness in the Baishuijiang Natural Reserve by employing the methods of linear regression models and variation partitioning analysis.The results showed that the explanatory power of water-energy dynamic hypothesis was stronger for shaping the patterns of amphibian and reptile species richness in the Baishuijiang Natural Reserve,and there existed a stronger collinearity between water-energy dynamic hypothesis and habitat heterogeneity hypothesis. The variable mean annual rainfall（ PAN） was included in the final linear regression model of amphibian species richness elevational pattern,but not in that of reptile species richness elevational pattern. However,the variables,potential evapotranspiration（ PET） and PET2,were included in the final linear regression model of reptile species elevational pattern. These results suggested that water and temperature played an important role in shaping the elevational patterns of amphibians and reptiles,respectively. The consequence of variation partitioning analysis showed that the independent exploratory power for shaping the elevational pattern of amphibian and reptile richness was weak,while that of water-energy dynamic hypothesis was powerful for the pattern. For the large-range species,the exploratory powers of two hypotheses were weak because of the boundary constraint effect.

关 键 词：物种丰富度 水分能量动态假设 栖息地异质性假设 两栖动物 爬行动物 白水江自然保护区 

分 类 号：Q958[生物学—动物学]