How is the light interception efficiency related to shoot structure in tall canopy species?
How is the light interception efficiency related to shoot structure in tall canopy species?
复制标题
高树冠物种的光拦截效率与枝条结构有何关系？
DOI：
10.1007/s00442-017-3926-0
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发表时间：
2017
期刊：
影响因子：
2.7
通讯作者：
T
中科院分区：
文献类型：
--
作者：
Osada N;Hiura;T
多物种共存是植物和森林生态学的一个基本方面。虽然树冠内叶片的空间排列是光截获和生产力的一个重要决定因素，但在共存的冠层物种之间，枝条结构差异很大。我们调查的相对重要性的结构特征，在确定光的可用性叶（I）和光截获效率在当年拍摄水平（LIECS;总光截获叶除以拍摄生物量）在顶部的冠层的11个冠层物种在日本的冷温带森林。在按照角落的规则，总质量，茎质量，叶层的总质量，单株叶面积，茎横截面积的当年拍摄彼此呈正相关，和分支强度（每分支1米长的单位当年拍摄的数量）与这些性状呈负相关。相比之下，I与这些性状无关，而是与叶片仰角（aL）相关。此外，物种间LIECS的变化是由I的变化（因此是inaL）引起的。因此，aL是该冷温性森林冠层枝条叶片光截获的一个关键参数。种间差异可能与植物在高光照和水分限制的林冠环境中形成的不同生理对策有关。小的变化，当年拍摄的物种之间的长度意味着在IandLIECS的变化将是重要的共存，这些冠层物种。
Coexistence of multiple species is a fundamental aspect of plant and forest ecology. Although spatial arrangement of leaves within crowns is an important determinant of light interception and productivity, shoot structure varies considerably among coexisting canopy species. We investigated the relative importance of structural traits in determining the light availability of leaves (I) and light interception efficiency at the current-year shoot level (LIECS; the total light interception of leaves divided by shoot biomass) at the top of crowns of 11 canopy species in a cool-temperate forest in Japan. In accordance with Corner’s rules, the total mass, stem mass, total mass of leaf laminae, individual leaf area, and stem cross-sectional area of current-year shoot were positively correlated with each other, and branching intensity (the number of current-year shoots per branch unit of 1-m length) was inversely correlated with these traits across species. In contrast,Iwas correlated not with these traits, but with leaf elevation angle (aL). Moreover, variation in LIECSacross species was caused by variation inI(thus inaL). Thus,aLis a key parameter for the leaf light interception of canopy shoots in this cool-temperate forest. Differences inaLacross species might be related to different physiological strategies that developed in the high light and water-limited environment of forest canopies. Small variation in the length of current-year shoots among species implies that variations inIand LIECSwould be important for the coexistence of these canopy species.