Wood nitrogen concentrations in tropical trees: phylogenetic patterns and ecological correlates.
Wood nitrogen concentrations in tropical trees: phylogenetic patterns and ecological correlates.
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热带树木中的木材氮浓度：系统发育模式和生态相关性。
DOI：
10.1111/nph.12943
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Sean C. Thomas
中科院分区：
文献类型：
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作者：
Adam R. Martin;David L. Erickson;W. J. Kress;Sean C. Thomas
在热带和温带树木中，木材化学性状被假设与沿着“木材经济谱”（WES）的物种生活史策略共同变化，但支持这些预期模式的证据仍然很少。由于其在养分储存中的作用，我们假设木材氮(N)浓度沿WES方向变化，在木材密度高的慢生长树种中较高，在木材密度低的快生长树种中较低。为了验证这一假设，我们量化了59种巴拿马硬木树种的木材N浓度，并利用该数据集研究了木材N的生态相关性和系统发育模式。近缘种在木氮上的相似性高于偶然预期。木材N与WD呈正相关，与对数变换后的相对生长率呈负相关，但关系较弱。我们发现了木材N与WD和对数转换死亡率之间共同进化的证据。我们的研究提供了木材N与树木生活史参数共变的证据，并且这些模式在热带硬木中一致地共同进化。这些结果为WES假设提供了一些支持，并表明木材在热带森林演替过程中是一个越来越重要的氮库。
In tropical and temperate trees, wood chemical traits are hypothesized to covary with species' life-history strategy along a 'wood economics spectrum' (WES), but evidence supporting these expected patterns remains scarce. Due to its role in nutrient storage, we hypothesize that wood nitrogen (N) concentration will covary along the WES, being higher in slow-growing species with high wood density (WD), and lower in fast-growing species with low WD. In order to test this hypothesis we quantified wood N concentrations in 59 Panamanian hardwood species, and used this dataset to examine ecological correlates and phylogenetic patterns of wood N. Wood N varied > 14-fold among species between 0.04 and 0.59%; closely related species were more similar in wood N than expected by chance. Wood N was positively correlated with WD, and negatively correlated with log-transformed relative growth rates, although these relationships were relatively weak. We found evidence for co-evolution between wood N and both WD and log-transformed mortality rates. Our study provides evidence that wood N covaries with tree life-history parameters, and that these patterns consistently co-evolve in tropical hardwoods. These results provide some support for the hypothesized WES, and suggest that wood is an increasingly important N pool through tropical forest succession.