生态学杂志2017，Vol.36Issue(10)：2751-2758,8.DOI:10.13292/j.1000-4890.201710.022
荷木叶片生理特性在树冠空间层次上的差异
Foliar physiological characteristics of Schima superba along a vertical canopy gradient
摘要
Abstract
We investigated leaf morphology,diurnal variation of photosynthesis,and chlorophyll content of Schima superba along different positions of canopy (top,middle and bottom layers) to determine its eco-physiological response to spatial variation.The results showed that specific leaf area of S.superba from the top layer was significantly lower than that from the middle and bottom layers.Leaf length and maximum width were significantly different among the three layers (P＜0.01),being bottom layer ＞ middle layer ＞ top layer.Compared with the middle and bottom layers,photosynthetically active radiation was the highest at the top canopy.Leaves from the top layer had significantly higher net photosynthesis rate (Pn),stomatal conductance (gs),carboxylation efficiency (Vc),transpiration rate (Tr) and stomatal limitation (Ls) than that from either the middle or bottom layer.Conversely,leaves from the bottom layer had the highest intercellular CO2 concentration (Ci).Photosynthetically active radiation from each layer had a significant positive correlation with Pn,gs,Vc,Tr and Ls,and was negatively correlated with Ci.The highest contents of chlorophyll a+b (Chl-a+b) and carotenoid (Car) of leaves were found from the middle and bottom layers,while the top layers had much higher chlorophyll a/b (Chl-a/b).The results indicated that illumination was the primary driver of variation in leaf morphological and physiological characteristics of S.superba along the vertical space of canopy.关键词
荷木/叶片形态/光合日变化/叶绿素含量/光合有效辐射Key words
Schima superba/leaf morphology/diurnal variation of photosynthesis/chlorophyll content/photosynthetically active radiation引用本文复制引用
黄科朝,何文,周翠鸣,黄玉清,顾大形,徐广平,周龙武..荷木叶片生理特性在树冠空间层次上的差异[J].生态学杂志,2017,36(10):2751-2758,8.基金项目
国家自然科学基金项目(31360202和41361057)、广西植物研究所基本业务费(桂植业16005)、广西科技攻关计划项目(桂科攻14124004-3-5、桂科重1598014-3)、广西林业科技项目(桂林科字[2013]第14号)、广西喀斯特植物保育与恢复生态学重点实验室基金项目(16-380-32)和广西自然科学基金项目(2013GXNSFAA019081和2015GXNSFBA139088)资助. （31360202和41361057）
