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以贡嘎山常绿落叶阔叶混交林5种主要树种为研究对象,分析其叶片比叶面积(SLA)、叶干重(LDW)、碳(C)、氮(N)、磷(P)含量、同位素丰度(δ13C、δ15N)等叶属性特征,阐明常绿落叶阔叶混交林主要物种叶片性状的差异以及各种性状之间的相关关系,揭示主要树种叶片的水分和养分利用效率之间的关系以及这种关系对该群落中主要树种共存的影响机制。结果表明:贡嘎山常绿落叶阔叶混交林常绿树种与落叶树种比叶面积存在显著差异,叶片C含量与N、P含量呈显著负相关,N含量和P含量呈显著正相关;SLA与N含量、N∶P呈显著正相关关系,与δ13C、C含量、C∶N呈显著负相关关系,而与P相关性不显著;叶片δ13C与C∶N相关性不显著;SLA较高的叶片具有较高的叶片N含量,较低的叶C含量、氮素利用效率(NUE)和水分利用效率(WUE);叶片的WUE和NUE之间不存在权衡关系,未采用水氮耦合的权衡机制以适应潮湿多雨的环境;孑遗植物康定木兰(Indigofera souliei)和连香树(Cercidiphyllum japonicum)均采用异于非孑遗物种的养分利用策略,形成生态位的分化而共存于群落。
Five main tree species of evergreen and deciduous mixed forest in Gongga Mountain were selected as the research object to analyze the changes of specific leaf area (SLA), leaf dry weight (LDW), carbon (C), nitrogen (N) Content and isotopic abundance (δ13C, δ15N). The correlation between leaf traits and the traits of major species in evergreen and deciduous broad-leaved mixed forests was clarified. The water and nutrient use efficiency of major tree species The relationship between the species and the impact of this relationship on the coexistence of major tree species in the community. The results showed that the specific leaf area of evergreen and deciduous tree species in the evergreen and deciduous mixed forest in Gongga Mountain was significantly different. The content of C and N and P in leaves were negatively correlated, and the contents of N and P were positively correlated. The SLA There was a significant positive correlation with N content and N:P, a significant negative correlation with δ13C, C content and C:N, but not with P; the correlation between δ13C and C:N was not significant and SLA was higher Leaves had higher N content, lower leaf C content, NUE and WUE. There was no trade-off relationship between leaf WUE and NUE, and no water-nitrogen coupling Trade-off mechanism to adapt to humid and rainy environment; relic plants Indigofera souliei and Cercidiphyllum japonicum are different from non-relict species using nutrient utilization strategy, the formation of niche differentiation and co-exist in the community.