Responses of leaf structure and photosynthetic properties to intra-canopy light gradients: a common garden test with four broadleaf deciduous angiosperm and seven evergreen conifer tree species.
Responses of leaf structure and photosynthetic properties to intra-canopy light gradients: a common garden test with four broadleaf deciduous angiosperm and seven evergreen conifer tree species.
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DOI：
10.1007/s00442-012-2279-y
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发表时间：
2012-09
期刊：
影响因子：
2.7
通讯作者：
Reich, P. B.
中科院分区：
文献类型：
--
作者：
Wyka, Tomasz P.;Oleksyn, J.;Zytkowiak, R.;Karolewski, P.;Jagodzinski, A. M.;Reich, P. B.
北方温带森林冠层的叶性状谱反映了万年青针叶树和落叶阔叶被子植物之间叶寿命的主要差异，以及冠内遮荫引起的可塑性改变。我们调查（1）是否长寿针叶树叶片表现出类似的冠层内可塑性短寿命阔叶树，（2）是否全球种间关系的光合作用，氮，和叶片结构确定的太阳叶充分描述叶片分化响应光梯度。我们研究了波兰一个普通花园中7种针叶和4种阔叶被子植物成年树的树内阳叶和阴叶的结构和光合特性。阴生叶比阳生叶的叶质量比面积低，但针叶树的相对差异小于阔叶树。在阔叶树中，LMA与叶片厚度和组织密度相关，而在针叶树中，LMA与厚度相关，但与密度无关。在阔叶树中，叶片厚度的减少与栅栏层变薄有关，而在针叶树中则不然。针叶树叶片的更保守的调整可能会导致系统发育的限制，对比叶解剖结构和拍摄几何形状的组合，但也从长寿的叶子的功能要求。质量为基础的氮浓度（Nmass）是相似的阳光和阴叶，针叶树比落叶阔叶树种低。鉴于此，阴影中较小的LMA对应于较低的基于区域的N浓度（Narea）。在万年青针叶树中，LMA和Narea是基于面积的光合速率（A最大（面积））与落叶阔叶被子植物相比，不太强大的预测。阳叶和阴叶的多元回归分析表明，在每个组中，A max（质量）与Nmass有关，但与LMA无关，而LMA在结合两组的分析中成为A max（质量）的重要协决定因素。因此，一个基本的基于质量的光合作用，氮，和叶结构之间的关系也存在于一个数据集结合内冠和跨功能类型的变化。本文的在线版本（doi：10.1007/s 00442 -012-2279-y）包含补充材料，可供授权用户使用。
Spectra of leaf traits in northern temperate forest canopies reflect major differences in leaf longevity between evergreen conifers and deciduous broadleaf angiosperms, as well as plastic modifications caused by within-crown shading. We investigated (1) whether long-lived conifer leaves exhibit similar intra-canopy plasticity as short-lived broadleaves, and (2) whether global interspecific relationships between photosynthesis, nitrogen, and leaf structure identified for sun leaves adequately describe leaves differentiated in response to light gradients. We studied structural and photosynthetic properties of intra-tree sun and shade foliage in adult trees of seven conifer and four broadleaf angiosperm species in a common garden in Poland. Shade leaves exhibited lower leaf mass-per-area (LMA) than sun leaves; however, the relative difference was smaller in conifers than in broadleaves. In broadleaves, LMA was correlated with lamina thickness and tissue density, while in conifers, it was correlated with thickness but not density. In broadleaves, but not in conifers, reduction of lamina thickness was correlated with a thinner palisade layer. The more conservative adjustment of conifer leaves could result from a combination of phylogenetic constraints, contrasting leaf anatomies and shoot geometries, but also from functional requirements of long-lived foliage. Mass-based nitrogen concentration (Nmass) was similar between sun and shade leaves, and was lower in conifers than in deciduous broadleaved species. Given this, the smaller LMA in shade corresponded with a lower area-based N concentration (Narea). In evergreen conifers, LMA and Narea were less powerful predictors of area-based photosynthetic rate (A max(area)) in comparison with deciduous broadleaved angiosperms. Multiple regression for sun and shade leaves showed that, in each group, A max(mass) was related to Nmass but not to LMA, whereas LMA became a significant codeterminant of A max(mass) in analysis combining both groups. Thus, a fundamental mass-based relationship between photosynthesis, nitrogen, and leaf structure reported previously also exists in a dataset combining within-crown and across-functional type variation. The online version of this article (doi:10.1007/s00442-012-2279-y) contains supplementary material, which is available to authorized users.
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影响因子：
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