井冈山鹿角杜鹃群落灌木层植物叶功能性状对海拔梯度的响应

Response of Leaf Functional Traits of Shrubs to Altitude in Rhododendron latoucheae Communities in Mt. Jinggangshan, Jiangxi, China

摘要:

为揭示鹿角杜鹃（Rhododendron latoucheae）群落灌木层植物叶功能性状及其对环境变化的响应趋势，对分布于井冈山不同海拔梯度鹿角杜鹃群落灌木层植物的叶功能性状进行了研究。结果表明，海拔梯度对灌木植物的叶功能性状有显著影响。随海拔的升高，叶片的干物质含量（LDMC）、厚度（LT）、氮含量（LNC）、磷含量（LPC）呈显著上升趋势，比叶面积（SLA）和N/P呈显著下降趋势，而叶大小（LS）呈先上升后下降的变化趋势；灌木植物叶片的LDMC与SLA、LS呈负相关，与LT、LNC、LPC呈正相关；SLA与LT、LNC呈负相关；LS与LT呈负相关；LNC与LPC呈正相关；N/P与LPC呈负相关；环境因子对灌木植物叶功能性状有重要影响，除受海拔的影响外，LPC、N/P还受坡位的影响，LS、LNC则分别还受到坡向和坡度的影响。因此，井冈山地区鹿角杜鹃群落灌木层植物通过改变叶功能性状来适应海拔和其它环境因子的变化。

Abstract:

In order to understand the adaptive mechanism of Rhododendron latoucheae community in Jinggang Mountain, Jiangxi Province, the changes in leaf functional traits of dominant species in shrub layer were analyzed along altitude. The results showed that the altitudinal gradient had significant effects on leaf functional traits of shrub species. The dry matter content (LDMC), thickness (LT), nitrogen (LNC) and phosphorus concentration (LPC) of leaves increased with altitude rising, whereas the specific leaf area (SLA) and N/P reduced, and the leaf size (LS) increased at first and then decreased. There were significant relations among leaf functional traits. LDMC had negative relation with SLA and LS, positive relation with LT, LNC and LPC. SLA and LT, LNC and LPC had positive relation, whereas LS and LT, N/P and LPC had negative relations, respectively. Environment factors influence on leaf functional traits. Except for altitude, slope also affected SLA, LPC and N/P, and aspect and gradient influenced LS and LNC, respectively. So, it was suggested that the shrub species in Rhododendron latoucheae community could adapt altitude and other environment factors by adjusting leaf functional traits.