兴安落叶松叶化学计量特征与光合性状的权衡及其种源差异  

Trade-offs between leaf stoichiometric characteristics and photosynthetic traits of Larix gmelinii and its differences among provenances

作　　者：上官虹玉 王传宽[1] 全先奎[1] SHANGGUAN Hongyu;WANG Chuankuan;QUAN Xiankui(Center for Ecological Research,Northeast Forestry University/Ministry of Education Key Laboratory of Sustainable Forest Ecosystem Management,Harbin 150040,China)

机构地区：[1]东北林业大学生态研究中心/森林生态系统可持续经营教育部重点实验室,哈尔滨150040

出　　处：《应用生态学报》2023年第6期1483-1490,共8页Chinese Journal of Applied Ecology

基　　金：中央高校基本科研业务费专项(2572020BA04);国家重点研发计划项目(2021YFD220040107)资助。

摘　　要：植物叶化学计量特征与光合性状的变异及其权衡关系能够表征植物对环境变化的响应和生态适应策略。本研究在帽儿山同质园内测定了17个地理种源兴安落叶松叶的化学计量特征[叶碳(C)、氮(N)、磷(P)含量、C/N、C/P、N/P]和光合性状[最大净光合速率(A_(max))、最大光电子传输速率(J_(max))、最大羧化速率(V_(max))],比较化学计量特征和光合性状的种源差异,分析二者的权衡关系及影响因子。结果表明:兴安落叶松叶化学计量特征与光合性状存在显著的种源差异,种源原地气候因子分别解释叶化学计量特征变异的54.8%和光合性状变异的67.2%,叶C、N、P含量和A_(max)、J_(max)、V_(max)均与种源原地干燥度(AI)存在显著正相关关系,C/N、C/P、N/P与AI存在显著负相关关系。冗余分析表明,叶化学计量特征解释了光合性状75.0%的变异,叶C、N、P含量与A_(max)、J_(max)、V_(max)存在显著正相关关系,C/N、C/P、N/P与光合性状均存在显著负相关关系。兴安落叶松叶化学计量特征与光合性状及其协同关系存在种源差异,是树木对种源地气候长期适应的结果。本研究对气候变化下树木的生态适应策略研究具有重要意义。Variations and trade-offs between leaf stoichiometric characteristics and photosynthetic traits are indicative of ecological adaptation strategies of plants and their responses to environment changes.In a common garden of Maoershan,we measured leaf stoichiometric characteristics(carbon content(C),nitrogen content(N),phosphorus content(P),C/N,C/P,N/P)and photosynthetic traits(_(max)imum net photosynthetic rate(A_(max)),_(max)imum electron transport rate(J_(max)),_(max)imum carboxylation rate(V_(max)))of Larix gmelinii from 17 geographical provenances.We examined the provenance differences in stoichiometric characteristics and photosynthetic traits,and analyzed their trade-offs and influencing factors.The results showed leaf stoichiometric characteristics and photosynthetic traits significantly differed among provenances.The climatic factors of seed-source sites explained 54.8%and 67.2%of the variation in stoichiometric characteristics and photosynthetic traits,respectively.Aridity index(AI)of seed-source sites was positively correlated with C,N,P,A_(max),J_(max),V_(max),but negatively with C/N,C/P,and N/P.Results of redundancy analysis showed that stoichiometric characteristics accounted for 75.0%of the variation in photosynthetic traits.A_(max),J_(max),V_(max) were positively correlated with C,N,P,and negatively correlated with C/N,C/P,N/P.The provenance differences in stoichiometric characteristics,photosynthetic traits,and their synergistic relationship suggested the long-term adaptation of trees to the climate of seed-source sites.These findings were of great significance for understanding ecological adaptation strategies of trees in response to climate change.

关 键 词：化学计量特征 光合性状 权衡策略 种源 

分 类 号：S791.222[农业科学—林木遗传育种]