摘要
植物功能性状是连接植物与环境的桥梁,可以反映植物对环境的适应能力.在地形复杂地区,研究不同水平上的植物功能性状随微地形的变化规律,对认识不同物种对复杂地形条件下多变环境的适应策略具有重要意义.以黄土丘陵区森林草原区自然植被为对象,分析土壤养分以及植物各功能性状值在科属和群落水平上微地形的响应关系.结果表明:不同植物的功能性状差异较大,植物科属组成差异是影响植物功能性状的主要因素,其次是坡向,而坡位对其影响较小;群落水平的性状值在微地形上无显著差异;豆科和菊科植物的叶氮含量和根氮含量在不同坡位上均存在显著差异,禾本科只有根组织密度在不同坡位上存在显著差异;群落水平性状值的根组织密度与土壤氮含量和土壤有机质含量呈显著正相关;豆科植物的叶氮含量和根氮含量与土壤磷含量呈显著正相关,菊科和禾本科叶氮含量和根氮含量与土壤氮含量呈显著正相关.这表明不同科属植物在对环境变化响应上存在较大差异,不同科属物种对环境适应策略不同.
Plant functional traits are closely tied to the performance of plants in specific microenvi- ronments, and reflect their ability to adapt to those microenvironments. In areas with complex to- pography, analyzing the responses of plant functional traits to micro-topographical changes is crucial to understanding the adaptive strategies of plants in diverse environments. This paper analyzed fluc- tuations in soil nutrients as well as correlations between plant functional traits and changes in topog- raphy at the family and community levels in selected natural vegetation communities in the forest- steppe zone of the loess hilly and gully region in Loess Plateau of China. Significant differences in plant functional traits were primarily driven by the phylogenetic background or species composition of the community. Slope aspect exerted less impact while slope positions had no significant effect on plant traits at the community level. No significant changes in plant functional traits were observed with changes in topography at the community level. However, leaf nitrogen and root nitrogen con- tents of Leguminous and Compositae species differed significantly with slope positions. The root tis- sue density of Graminaceous species differed significantly with slope positions. Root density exhibi- ted significant positive correlations with soil nutrient and carbon contents at the community level. Both leaf nitrogen and root nitrogen contents of Leguminous species were positively correlated with soil phosphorus content, while leaf nitrogen and root nitrogen contents of both Graminaceous and Compositae species were significantly positively related to soil nitrozen content. The results demon-strate the different responses of species of different families to changes in micro-topography and their distinctive adaptive strategies to the environment.
出处
《应用生态学报》
CAS
CSCD
北大核心
2014年第12期3413-3419,共7页
Chinese Journal of Applied Ecology
基金
中国科学院知识创新工程重要方向项目(KZCX2-EW-406)
国家自然科学基金项目(41271297
41030532)资助
关键词
植物功能性状
微地形
土壤养分
物种水平
群落水平
plant functional trait
micro-topography
soil nutrient
species-level
community-level.
