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《Chinese Journal of Plant Ecology》 2017-11
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Variations and interrelationships of foliar hydraulic and photosynthetic traits for Larix gmelinii

LI Zhi-Min;WANG Chuan-Kuan;LUO Dan-Dan;Center for Ecological Research,Northeast Forestry University;  
Aims Variations and potential trade-offs of leaf hydraulic and photosynthetic traits are essential for assessing and predicting the effect of climate change on tree survival,growth and distribution.Our aims were to examine variations and interrelationships of leaf hydraulic and photosynthetic traits in response to changes in site conditions for Dahurian larch(Larix gmelinii)—a dominant tree species in Chinese boreal forests.Methods This study was conducted at the Maoershan Forest Ecosystem Research Station.A transect of 27 year-old Dahurian larch plantation was established that consisted of five plots extending from the valley to the ridge of a slope.The predawn leaf water potential(Ψ_(pre)),area-and mass-based leaf hydraulic conductance(K_(area) and K_(mass),respectively),resistance to embolism capacity(P_(50)),leaf mass per area(LMA),net photosynthetic rate(A),and leaf nitrogen content(N) were measured in August 2016.Important findings The Ψ_(pre),K_(area),K_(mass),P_(50),A,LMA,and N all varied significantly among the plots(p 0.05),indicating significant intra-specific variations in these traits in response to the changes in site conditions.The P_(50) was significantly(p 0.05) correlated with Ψ_(pre),K_(area) or K_(mass),suggesting that a trade-off between hydraulic efficiency and safety exist within the species to some degree.There were significant(p 0.05) pairwise correlations between A,LMA,and N.Nevertheless,there was no significant(p 0.05) correlation between the measured photosynthetic traits and hydraulic traits.We concluded that the intra-specific variations and multiple interrelationships of the leaf hydraulic and photosynthetic traits for the larch reflect the plasticity of its leaf traits and strategies of its survival and growth as a result of its acclimation to diverse site conditions.
【Fund】: 国家“十三五”重点研发计划项目(2016YFD0600201);; 教育部长江学者和创新团队发展计划(IRT_15R09)
【CateGory Index】: S791.222
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