濒危植物长柄双花木(Disanthus cercidifolius var. longipes)叶功能性状随生长发育阶段的变化

对珍稀濒危植物长柄双花木(Disanthus cercidifolius var. longipes H. T. Chang)不同生长发育阶段的叶厚度(LT)、叶面积(LA)、叶含水量(LWC)、比叶面积(SLA)、叶片全氮含量(LNC)和叶片全磷含量(LPC)等叶功能性状及性状症候群的变化进行了研究。结果显示,不同发育阶段长柄双花木的叶功能性状存在显著差异,其中LT、LA随植株发育呈递增趋势,而LWC、SLA、LNC和LPC则呈递减趋势。主成分分析显示,随着长柄双花木的不断发育,性状症候群朝着LT、LA增大而LWC、SLA、LNC和LPC减小的方向变化。表明该物种的经济策略随着发育进程由快收益向慢收益转变。

Effects of developmental stage on the leaf functional traits of the endangered shrub species Disanthus cercidifolius var. longipes

Changes in leaf functional traits, including leaf thickness(LT), leaf area(LA), leaf water content(LWC), specific leaf area(SLA), leaf nitrogen content(LNC), and leaf phosphorus content(LPC), as well as trait syndromes were studied in Disanthus cercidifolius var.longipes H.T.Chang during different developmental stages. Results showed that the leaf functional traits of D. cercidifolius var. longipes were significantly different among deve-lopmental stages. Both LT and LA increased with plant development, whereas LWC, SLA, LNC, and LPC decreased with plant development. Principal component analysis showed that the trait syndromes of D. cercidifolius var. longipes changed toward increasing LT and LA, but decreasing LWC, SLA, LNC, and LPC with plant development. Thus, the economic strategy of D.cercidifolius var. longipes changed from fast-profit to slow-profit pattern with deve-lopmental stage.