武夷山49种木本植物叶片与细根经济谱

Leaf and fine root economics spectrum across 49 woody plant species in Wuyi Mountains

植物经济谱能够阐述维管植物在资源获取和储存之间的权衡策略,为理解生态位分化和物种共存机制等提供科学依据。该研究通过对武夷山49种木本植物的单叶面积(ILA)、比叶面积(SLA)、叶碳含量(LCC)、叶氮含量(LNC)和叶磷含量(LPC)等5个叶片性状以及根组织密度(RTD)、比根长(SRL)、比根面积(SRA)、根碳含量(RCC)、根氮含量(RNC)和根磷含量(RPC)等6个细根性状进行测定,探讨木本植物叶片与细根经济谱是否存在以及常绿和落叶物种间的植物经济谱差异。结果表明:沿着性状贡献率相对较大的PC1轴,能够定义出叶经济谱(LES)、根经济谱(RES)和整株植物经济谱(WPES)。大部分常绿物种分布在经济谱保守的一侧,而大部分落叶物种聚集在获取的一侧。此外,叶片PC1、细根PC1和整株植物PC1的两两得分之间均存在显著正相关关系,常绿和落叶物种具有共同的异速指数,但不存在共同的异速常数。这些结果揭示了亚热带物种叶片与细根的策略遵循着WPES的协调整合,表明叶片、细根以及整株植物之间是采取协同变化的资源策略,而分布于经济谱两端的常绿和落叶物种则是通过不同的方式来构建WPES。

Aims The plant economics spectrum would explain the trade-off strategies of vascular plants between resource acquisition and resource storage,and provide a scientific basis for understanding the mechanisms of niche differentiation and species coexistence.Methods In this study,we measured leaf/root traits of 49 woody plants species in Wuyi Mountains,including individual leaf area(ILA),specific leaf area(SLA),leaf carbon content(LCC),leaf nitrogen content(LNC)and leaf phosphorus content(LPC),root tissue density(RTD),specific root length(SRL),specific root surface area(SRA),root carbon content(RCC),root nitrogen content(RNC)and root phosphorus content(RPC).Then,we detected if the leaf and fine root economics spectrum of the plants exist,and analyzed the differences of the plant economics spectrum between evergreen and deciduous species.Important findings The results showed that along the PC1 axis,a leaf economics spectrum(LES),a root economics spectrum(RES)and a whole-plant economics spectrum(WPES)can be defined,respectively.Most of the evergreen species were on the conservative side,while deciduous species,on the acquisitive side of the economics spectrum.There were significant positive correlations among the scores of leaf PC1,root PC1 and whole-plant PC1.In the relationships,evergreen and deciduous species shared common scaling exponents,but common scaling constants lack,revealing that the leaf and root strategies of the subtropical species are coordinated toward the integration of WPES.The evergreen and deciduous species distributed at different sides of the economics spectrum are in different ways to construct the WPES.