中文摘要：

物种丰富度沿海拔梯度的分布格局是生物多样性研究的热点之一。以独龙江地区种子植物为对象，利用当地植物志资料，结合数字高程模型（DEM）数据，讲究了独尼江地区种子植物物种多样性的垂直分布格局，并对Rapoport法则进行了验证。结果表明：随着海拔的升高，物种丰富度和物种密度均呈线性下降趋势，而物种分布幅度呈明显增大趋势，与Rapoport法则一致；进一步分析表明，物种密度随着物种分布幅度的增大而下降；随若年平均温度的升高，物种密度呈明显上升趋势，而物种分布幅度呈减小趋势。

英文摘要：

Altitudinal patterns of species richness have become a focus of ecological research. Based on regional flora and Digital Elevation Model in Drung river area, the authors explored the altitudinal patterns of species richness in the Drung river area, Southwest China. Species richness and species density deceased with an increase of elevation. A negative relationship was observed between distribution range size of species and elevation, while a reverse pattern was found between the range size and species density, and the result is consistent with the Rapoport＇s rules. Species density increased with the increase of mean annual temperature, while the distribution range size of species decreased, indicating that energy is the major factor controlling the altitudinal patterns of species density.