大岗山亚热带常绿阔叶林16种木本植物功能性状的变异特征

The Variation Characteristics of Plant Functional Traits among 16 Woody Plants in Subtropical Broad-leaved Forest at Dagang Mountain

以大岗山亚热带常绿阔叶林的16种木本植物(11种常绿,5种落叶)为研究对象,探讨叶面积、比根长、木质部密度、叶氮含量等15个功能性状在种间和种内的变异特征.研究结果表明:不同功能性状的变异程度存在很大差异,比叶面积、比根长及各构件的N、P含量的变异较大(24. 38%～55. 60%),其次是各构件的组织密度(23. 00%～28. 80%),各构件的C含量变异程度最低(9. 29%～11. 00%);不同功能性状的变异来源存在很大差异,结构性状变异主要来源于个体水平(高于50%),而化学性状的变异主要来源于物种水平(高于50%),植物各构件的C含量种间变异高于70%,只有比叶面积、叶N和P含量在生活型水平上有较大变异(29. 94%、14. 74%、63. 09%).植物功能性状的种内变异是普遍存在的,但不同功能性状的种内变异程度存在差异.

To explore the interspecific and intraspecific variation characteristics of 15 common functional traits,such as specific leaf area(SLA),specific root length(SRL), wood density(WD)and leaf nitrogen concentration(LN),We surveyed 16 main woody plants(11 evergreen trees,5 deciduous trees)in subtropical evergreen broad-leaved forest of Dagang mountain. The results show that the variation degree of different functional traits was different. Specific leaf area(SLA),specific root length(SRL)and the N,P content of each component has the largest variations(24. 38% ~ 55. 60%),followed by the tissue density of each component(23. 00% ~ 28. 80%),and the variation degree of carbon content is the lowest(9. 29% ~ 11. 00%). The variation sources of different functional traits vary widely. The variation of structural traits mainly comes from the individual level(over 50%),while the variation of chemical traits is mainly derived from the species level(over 50%). The carbon content of interspecific variation is higher than 70% in each component of plant. Only the specific leaf area,leaf N and P content had significant variation at the life form level(evergreen or deciduous)level(29. 94%,14. 74%,and 63. 09%). Interspecific variation of plant functional traits is ubiquitous,but degree is different.