西双版纳热带季节雨林椆琼楠种内功能性状

Intraspecific Functional Traits of Beilschmiedia roxburghianain Xishuangbanna Tropical Seasonal Rainforest

探究椆琼楠个体功能性状间的相关性及功能性状随胸径梯度的变化情况,为物种共存和群落构建提供理论基础。以西双版纳热带季节雨林310株椆琼楠为研究对象,测量树高、叶绿素含量、叶片厚度、叶面积、比叶面积、叶片干物质含量和木质密度等功能性状以及胸径,进行Pearson相关分析和线性回归分析。结果表明:叶绿素含量与叶片厚度呈显著正相关、与比叶面积呈显著负相关;叶片厚度与叶片干物质含量呈显著正相关、与比叶面积呈显著负相关;叶片干物质含量与比叶面积呈显著负相关。椆琼楠树高、叶绿素含量、叶片厚度和叶片干物质含量随胸径梯度递增呈线性升高趋势;叶面积、比叶面积和木质密度随胸径梯度递增呈线性降低趋势。

The height,chlorophyll content,leaf thickness,leaf area,specific leaf area,leaf dry matter content,wood density and diameter at breast height(DBH)of 310 Beilschmiedia roxburghiana trees in Xishuangbanna Tropical Seasonal Rainforest were determined and their correlations were evaluated by Pearson’s correlation and linear regression analysis to provide the theoretic basis for species coexistence and plant community construction by discussing the correlations between different intraspecific functional traits and between the functional traits and DBH in B.roxburghiana.Result:The chlorophyll content is positively and significantly related to leaf thickness but negatively and significantly related to specific leaf area.The leaf thickness is positively and significantly related to leaf dry matter content but negatively and significantly related to specific leaf area.There is a significant negative correlation between leaf dry matter content and specific leaf area.The height,chlorophyll content,leaf thickness and leaf dry matter content of B.roxburghiana show the rising trend with DBH increase.But the leaf area,specific leaf area and wood density show the declining trend with DBH increase.