Differences in the dry-mass cost of sapling vertical growth among 56 woody species co-occurring in a Bornean tropical rain forest
Differences in the dry-mass cost of sapling vertical growth among 56 woody species co-occurring in a Bornean tropical rain forest
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DOI：
10.1111/j.1365-2435.2006.01217.x
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发表时间：
2007-02-01
影响因子：
5.2
通讯作者：
Nakashizuka, Tohru
中科院分区：
文献类型：
--
作者：
Aiba, Masahiro;Nakashizuka, Tohru
1.通过对婆罗洲雨林56种同域分布树种幼树的地上结构分析，结合系统发育背景，阐明干物质消耗的种间差异及其生态后果.在1.5米高的树苗的扩展成本（地上总质量）变化8倍之间的56种。然而，没有显着差异的扩展成本之间观察到树苗的三种冠型（分支，单轴单叶，和单轴复叶），虽然单轴冠型已被认为是一种适应实现快速的高度增长。差异的缺乏是因为单轴树苗在显示给定叶面积的结构成本方面的优势出乎意料地小。林下树种有一个显着较高的扩展成本比冠层物种，因为他们更厚，因此，更重的树干。这一趋势在三种树冠类型中是共同的;因此，较高的推广成本不是由林下物种中特定树冠类型的流行引起的。对于所有56个物种相结合，高度生长效率和光截获增强形态之间的权衡是突出的。这种结构上的权衡，这使得高效的垂直生长与林下生存不相容，可能使这些物种在一个时间上异质的光环境中稳定共存。
1. Above-ground structure was analysed in saplings of 56 sympatric species in a Bornean rain forest with consideration of the phylogenetic background to elucidate interspecific variation in the dry-mass cost and its ecological consequences.2. The extension cost (total above-ground mass) in 1.5-m tall saplings varied eightfold among the 56 species. However, no significant differences in extension cost were observed among saplings of three crown types (branched, monoaxial simple-leaved, and monoaxial compound-leaved), although the monoaxial crown type has been considered an adaptation for achieving rapid height growth. The lack of differences arose because the advantages of monoaxial saplings in structural cost for displaying a given leaf area were unexpectedly small.3. Understory species had a significantly higher extension cost than canopy species because of their thicker, and consequently, heavier trunks. This trend was common to the three crown types; thus, the higher extension cost was not caused by the prevalence of a specific crown type in understory species.4. For all 56 species combined, the trade-off between height growth efficiency and light-interception-enhancing morphology was prominent. This structural trade-off, which makes efficient vertical growth incompatible with survival in the understory, potentially enables the stable coexistence of these species in a temporally heterogeneous light environment.