广西植物2016，Vol.36Issue(2)：127-136,10.DOI:10.11931/guihaia.gxzw201503015
生境异质性对鼎湖山常绿阔叶林群落功能多样性的影响
Effects of habitat heterogeneity on community functional diversity of Dinghu Mountain evergreen broad-leaved forest
摘要
Abstract
Species co-existence mechanisms have long been one of the core topics in community ecology. To explore the changes in community functional diversity of Dinghushan evergreen broad-leaf forest under the heterogeneous habitats and to find out the main driving factors of the functional diversity varations, based on the second community survey data of the 20 hm2 forest dynamics plot in Dinghushan National Nature Reserve, 27 subplots (20 m×20 m) were selected according to the changes of relative elevation and topograph. These 27 subplots can stand for the heterogeneous habitats in Dinghushan ever-green broad-leaved forest. Leaf functional traits of all the trees with DBH (diameter at breast height)≥1 cm in the 27 sub-plots were measured to calculate the functional diversity ( functional dispersion and community weighted mean are caculated as the functional diversity in this paper) during the summer of 2013. The measured traits included morphological traits (spe-cific leaf area, leaf dry matter content, leaf area and leaf lenth to leaf width ratio) and stoichiometric traits (leaf carbon, nitrogen, phosphorus content). Combining with the topographic and soil information, we analysed the main environmental factors that influence the variation of functional diversity. To elucidate the relative importance of environmental filtering and competitive interactions for species co-existence of Dinghushan evergreen broad-leaved forest, we inferred the shifts in func-tional diversity patterns across environmental gradients. The results indicated that functional divergence and community-weighted mean were in close relation with environmental factors, especially elevation, convexity and soil fertility. In the op-timal environmental conditions (high relative elevation, high convexity and higher soil nutrient content), plants adopt the similar (functional divergence decreased) adaptive strategy of efficient conservation of nutrient (low SLA, high LDMC), which suggested that environmental filtering played a stronger role;while in the adverse environmental conditions ( low rela-tive elevation, low convexity and lower soil nutrient content), the traits were various (functional divergence increased) and use fast growing strategy (high SLA, low LDMC), since competitive interactions might play a key role. The functional di-vergence of leaf area and leaf nitrogen contents increased in better environmental conditions (high relative elevation, high convexity and higher soil nutrient content), and these two traits (leaf area and leaf nitrogen content) were opposite to the others ( specfic leaf area, leaf dry matter content, leaf length to leaf width ratio, leaf carbon and phosphorus content ) . These results indicated that different niche axes ( environments) had different importances in the changes in func-tional traits dispersion, and illustrated that we could use plants diverse strategies to adapt to heterogeneous environments in local scale.关键词
群落生态学/功能多样性/生境异质性/群落共存机制/适应性策略Key words
community ecology/functional diversity/habitat heterogeneity/species co-existence mechanisms/adap-tive strategy分类
生物学引用本文复制引用
周光霞,黄立新,臧晓蔚,韦霄,叶万辉,沈浩..生境异质性对鼎湖山常绿阔叶林群落功能多样性的影响[J].广西植物,2016,36(2):127-136,10.基金项目
国家自然科学基金(31370446)[Supported by the National Natural Science Foundation of China(31370446)]. （31370446）
