云南哀牢山南洋木荷叶片功能性状沿树冠高度的垂直变异  

Variation in Leaf Functional Traits of Schima noronhae Tree along Different Canopy Gradients in Ailao Mountains,Yunnan

作　　者：金楠 段志宇 冯磊鋆 鲁志云[4] 袁盛东 董金龙[1] 何在新 吉馗 巩合德 JIN Nan;DUAN Zhiyu;FENG Leiyun;LU Zhiyun;YUAN Shengdong;DONG Jinlong;HE Zaixin;JI Kui;GONG Hede(Xishuangbanna Station for Tropical Rainforest Ecosystem Studies,Chinese Academy of Sciences,Mengla Yunnan 666303,P.R.China;China Administration Bureau of Mengla,Xishuangbanna National Nature Reserve,Mengla Yunnan 666303,P.R.China;Southwest Forestry University,Kunming Yunnan 650224,P.R.China;Ailaoshan Station for Subtropical Forest Ecosystem Studies,Chinese Academy of Sciences,Jingdong Yunnan 676209,P.R.China;School of Geography and Tourism,Qilu Normal University,Jinan Shandong 250200,P.R.China)

机构地区：[1]中国科学院西双版纳热带雨林生态系统研究站,云南勐腊666303 [2]西双版纳国家级自然保护区勐腊管护所,云南勐腊666303 [3]西南林业大学,云南昆明650224 [4]中国科学院哀牢山亚热带森林生态系统研究站,云南景东676209 [5]齐鲁师范学院地理与旅游学院,山东济南250200

出　　处：《西部林业科学》2024年第6期39-45,共7页Journal of West China Forestry Science

基　　金：国家自然科学基金面上项目(32471599,31872685);云南省基金项目(2019FB037)。

摘　　要：为了更好地揭示植物对环境的响应机制,以云南哀牢山中山湿性常绿阔叶林的优势种南洋木荷为研究对象,通过测量其不同树冠高度的叶片经济性状和水力性状,探讨个体尺度上不同树冠高度植物叶功能性状的垂直变异。结果显示:(1)沿树冠高度,南洋木荷叶片经济和水力性状表现出显著的垂直变异。在叶片经济性状中,除比叶重差异不明显外,叶面积呈现下降趋势,叶片厚度、叶干物质量和净光合速率呈上升趋势。在水力性状中,气孔导度和正午叶片水势呈现下降趋势,而叶片内部水分利用效率呈现上升趋势。(2)南洋木荷叶片经济和水力性状之间也存在一定的相关关系。比叶重与叶厚和叶干物质量、叶厚与叶干物质量均呈显著正相关关系,叶厚与叶面积呈显著负相关关系。正午叶片水势和叶片内部水分利用效率呈正相关关系。可得结论:南洋木荷的叶功能性状在个体尺度上存在环境可塑性,叶片通过调整形态结构来协调光合生理性状与水力性状。研究结果有助于理解亚热带常绿阔叶林中物种分布格局的形成和物种多样性维持的重要机制。Leaf economics and hydraulic traits enable understanding and predicting the impact of global climate change on species growth and forest ecosystem processes,while these traits are usually assessed as means values in most studies.In this study,we tested variations and relationships of leaf economics and hydraulic traits for Schima noronhae,a dominant tree species in Chinese evergreen forest,along a vertical canopy gradient.The economics traits measured included leaf area,leaf mass per area,leaf thickness,leaf dry matter mass,net photosynthetic rate,stomatal conductance,and leaf hydraulic traits,including midday leaf water potential and internal leaf water use efficiency.The results showed that most leaf functional traits of individual-level S.noronhae varied significantly at different canopy heights.Leaf area and stomatal conductance at the lower canopy were 2.19 and 1.19 times higher than those at the upper canopy,while the leaf thickness,leaf dry matter content and net photosynthetic rate in the upper canopy increased 1.15-,1.09-,and 1.14-fold than those in the low canopy,respectively.Among the hydraulic traits,midday leaf water potential showed a decreasing trend in opposing trend for the internal leaf water use efficiency.Meanwhile,some leaf functional traits exhibited some correlation.Leaf mass per area was significantly and positively correlated with leaf thickness and leaf dry matter mass;Leaf thickness and leaf dry matter mass,and leaf thickness was significantly and negatively correlated with leaf area.Middle leaf water potential and internal leaf water use efficiency were positively correlated.In addition,there was also a coordination between leaf economics and hydraulic traits,suggesting that leaves coordinate photosynthetic and hydraulic traits by adjusting their morphological and structural traits,thereby adapting to changes in the micro habitat of different canopy heights at the individual level.

关 键 词：南洋木荷 叶片功能性状 净光合速率 正午叶片水势 个体变异 树冠 哀牢山 

分 类 号：S718.5[农业科学—林学]