白水江自然保护区植物物种多样性的垂直格局:面积、气候、边界限制的解释

Vertical patterns of plant species diversity in the Baishuijiang Nature Reserve: Explanation of area,climate and boundary constraint

采用线性回归模型和方差分离方法,分析面积、气候、边界限制对白水江自然保护区植物物种垂直分布格局的相对作用和独立作用.结果表明:白水江自然保护区植物物种及不同类群的物种多样性随海拔的升高呈单峰分布格局,峰值分布偏向低海拔段.白水江自然保护区植物物种的垂直分布格局是由各种因素协同作用的结果.水分能量动态假设对白水江自然保护区植物物种多样性垂直格局的解释力最强,面积是影响物种多样性格局的第二重要因子.边界限制效应可作为对白水江自然保护区植物物种多样性垂直格局解释的补充机制.边界限制对不同种域的物种解释力存在较大差异,随着物种分布宽度的增加,边界限制的解释力逐渐增加.

The linear regression models and variation partitioning method were used to analyze the relative and pure effects of area, climate, and boundary constraint on altitudinal patterns of plant species diversity in the Baishuijiang Natural Reserve. The results showed that diversities of overall plant species and different group species exhibited humped-shaped patterns and the peaks were be- low the mid-point of the elevation span. The patterns were shaped by all factors together. The ex- planatory power of water-energy hypothesis for the pattern was the strongest. Area acted as a se- condary factor the patterns. Boundary constraint effect was a complementary mechanism to explain the plant species diversity altitudinal patterns in Baishuijiang region. The explanatory powers of boundary constraint for different-range species were clearly different. With the increase of species range, boundary constraint showed an increasingly strong correlation with richness patterns.