檫木叶片性状沿海拔梯度的响应特征  

Responses of leaf traits of Sassafras tsumu( Hemsl.) Hemsl. along an altitudinal gradient

作　　者：蒋艾平 姜景民[1] 刘军[1] 

机构地区：[1]中国林业科学研究院亚热带林业研究所,浙江富阳311400

出　　处：《生态学杂志》2016年第6期1467-1474,共8页Chinese Journal of Ecology

基　　金：国家林业局公益性行业科研专项(201404104)资助

摘　　要：植物叶片性状是植物与环境长期互作的结果,对环境变化具有敏锐的捕捉力,而且植物叶片性状影响植物的"投资-收益"关系。本文以天目山不同海拔的檫木叶片为材料,分析檫木叶面积、叶长宽比、叶片干重和比叶面积等叶片形态性状以及叶绿素含量和叶氮含量(N_(area))等叶片生理性状对海拔的响应。结果表明,不同海拔亚群体间叶面积具有显著差异,比叶面积、叶长宽比和叶片干重存在极显著差异;叶长宽比和叶片干重在亚群体内的变异系数小于叶面积和比叶面积,说明檫木叶片形态性状在亚群体间存在着不同程度的变异。比叶面积与叶面积和叶长宽比具有显著正相关,与叶片干重呈显著负相关;叶绿素含量与N_(area)呈显著正相关;通过檫木叶片性状与温度的线性回归表明,叶面积、比叶面积、叶绿素含量和N_(area)随着温度下降而下降,与之相反,叶片干重和叶长宽比则逐渐增加。Leaf traits,the results of long-term interactions between plants and environment,are extremely sensitive to the surroundings in the process of evolution and influence the plants ＇‘cost-benefit＇relationship. We investigated the leaf traits of Sassafras tsumu（ Hemsl.） Hemsl.along an altitudinal gradient in the Tianmushan Mountain. Leaf morphological traits of S. tsumu,including leaf area,the ratio of leaf length to width,leaf dry weight and specific leaf area,were analyzed. Similarly,leaf physiological traits,including chlorophyll concentration and leaf nitrogen content（ Narea）,were analyzed. The results indicated that a significant difference existed in leaf area,and extremely notable differences existed in specific leaf area,the ratio of length to width and dry weight among subpopulations along the altitudinal gradient. Additionally,the coefficients of variation of dry weight and the ratio of length-width within populations was less than those of leaf area and specific leaf area,which illustrated that leaf morphological traits exhibited different variations among subpopulations. Moreover,specific leaf area had significant positive correlations with leaf area and the ratio of length to width,while it had a significant negative correlation with leaf dry weight. Chlorophyll concentration showed a significant positive correlation with Narea. The linear regression relationship between the leaf characteristics and temperature demonstrated that leaf area,specific leaf area,chlorophyll concentration and Nareadecreased as temperature dropped. On the contrary,dry weight and the ratio of length to width gradually increased.

关 键 词：天目山 海拔 叶片性状 叶绿素 檫木 

分 类 号：S792.22[农业科学—林木遗传育种]