片段化森林中檵木幼苗种内叶经济性状变异及其驱动因子

Translated title of the contribution: The driving factors of intraspecific leaf economic traits variations of Loropetalum chinense seedlings in fragmented forest

Chun Chen, Jianping He, Shilu Zheng, Yannan Wu, Ying Wang, Gaofu Xu, Mingjian Yu

Research output: Contribution to journalArticlepeer-review

Abstract

Intraspecific trait variations contribute to the adaptability of plant to the heterogeneous environments,which affect population regeneration,community assembly and ecosystem processes.This study aimed to explore the intraspecific variations of leaf economic traits and how it was shaped by habitat heterogeneity in fragmented forest.We measured seven leaf economic traits (i.e.specific leaf area (SLA),leaf total carbon content (C),leaf total nitrogen content (N),etc.) of seedlings (n=200) of a common native shrub species,Loropetalum chinense,in the Thousand Island Lake (TIL),as well as in site habitat conditions (i.e.canopy closure,soil total carbon content,soil total nitrogen content,etc.) of each seedling.We then performed the correlation test,principal component analysis,linear mixed effects model and so on to examine the variability of leaf traits and underlying environmental drivers.The results are as follows: (1) 12 of the 21 correlations composed of seven leaf economic traits are significant.Principal component analysis (PCA) showed that PC1 explains 43.02% of the total trait variations,which is positively correlated with SLA,N and chlorophyll concentration (Chl),and negatively correlated with leaf dry matter content (LDMC) and leaf carbon nitrogen ratio (C:N),indicating an intraspecific economics spectrum of L.chinense seedlings that reflects maximum photosynthetic capacity. (2) Habitat fragmentation alters the environmental conditions and leaf economic traits of L.chinense seedlings.Specifically,canopy closure is significantly lower on islands than in mainland.On the other hand,leaf traits of L.chinense seedlings on islands are with lower PC1 value (i.e.the 'slow' end of leaf economics spectrum) than seedlings in mainland.Within islands,leaf traits of L.chinense seedlings at the edge of large island are with lower PC1 value compared to seedlings at the interior of large island.(3) The environmental influences on intraspecific leaf economic traits of L.chinense are mainly manifested as a significant positive effect of canopy closure on PC1.This study shows that leaf economics spectrum exists at the growth stage of L.chinense seedlings in fragmented habitats.Moreover,habitat fragmentation can affect intraspecific leaf economic traits of L.chinense by altering habitat conditions.Habitat fragmentation initiates the shift of leaf economic traits of L.chinense seedlings towards a slower resource-use strategy.

Translated title of the contributionThe driving factors of intraspecific leaf economic traits variations of Loropetalum chinense seedlings in fragmented forest
Original languageChinese (Traditional)
Pages (from-to)718-727
Number of pages10
JournalJournal of Zhejiang University, Science Edition
Volume48
Issue number6
DOIs
Publication statusPublished - 25 Nov 2021

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