中文摘要：

功能的差异对植物社区的生态的过程重要。我们分析了危及的种类的功能的差异的变化， Cercidiphyllum japonicum，沿着在 Shennongjia 的一个 elevational 坡度的社区保留，华中。10 的六十个阴谋 ? 在在绿空格和 agroforestry 系统的许多国家的编辑。我们在在 3 种的 2 岁的泡桐属树 tomentosa 树苗的直径生长上学习了灌溉的影响 ? m ?????? h

英文摘要：

Functional diversity is significant to ecological processes of plant communities. We analyzed the variation of functional diversity of endangered species, Cercidiphyllum japonicum, communities along an elevational gradient in the Shennongjia Reserve, central China. Sixty plots of 10 9 20 m from 1,350 to 2,050 m were set up and species composition, traits and environmental variables were measured and recorded. These data were analyzed using five functional diversity indices, functional attribute diversity, modified functional attribute diversity, plot based functional diversity, community based functional diversity and Rao＇s functional diversity indices（Rao＇s index）,Functional diversities of C. japonicum communities were rich and varied greatly. Functional diversity declined nonlinearly with increasing elevation. Functional diversity was significantly correlated with species richness and heterogeneity. Elevation was a key environmental variable influencing functional diversity and species diversity. The five functional diversity indices were all effective for measuring functional diversity of communities. Functional diversity can be used as an indicator of conservation efficiency of endangered species such as C. japonicum.