Interspecific variation in functional traits, not climatic differences among species ranges, determines demographic rates across 44 temperate and Mediterranean tree species
Interspecific variation in functional traits, not climatic differences among species ranges, determines demographic rates across 44 temperate and Mediterranean tree species
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DOI：
10.1111/j.1365-2745.2010.01718.x
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发表时间：
2010-11-01
影响因子：
5.5
通讯作者：
Retana, Javier
中科院分区：
文献类型：
--
作者：
Martinez-Vilalta, Jordi;Mencuccini, Maurizio;Retana, Javier
1.令人惊讶的是，在野外条件下，对树种的功能性状和种群数量之间的关系知之甚少，特别是对于非热带树种。研究了西班牙44个最丰富树种的关键功能性状（木材密度、最大树高、比叶面积、叶片含氮量、叶片大小和种子质量）、种群统计率（相对生长率和死亡率）和气候生态位之间的种间关系.人口统计数据来自西班牙森林清查，这是一个重复测量计划，包括c。90000块永久性土地分布在C的领土上。50万平方公里。功能性状数据主要来自于在西班牙东北部加泰罗尼亚进行的更详细的森林清查。我们的研究区域涵盖了广泛的气候条件，毫不奇怪，所研究的物种在其气候生态位显着不同。尽管如此，我们的研究结果表明，物种间人口统计率的变化与功能特征的差异比物种间平均气候的差异更相关。最大树高，特别是WD，成为关键的功能性状，并在我们的研究中的人口统计率的最佳预测。这两个变量也介导了RGR和MR之间的轻微显着关系，表明生长和存活之间的弱权衡。我们的结果的主要方面没有改变明确纳入系统发育的影响，这表明所观察到的关系是不是由于几个主要分支之间的分歧。合成.我们的研究支持了这样一种观点，即不同物种的功能性状差异使它们在很大程度上独立于沿着环境梯度的气候条件。
1. Surprisingly little is known about the relationship between functional traits and demographic rates of tree species under field conditions, particularly for non-tropical species.2. We studied the interspecific relationship between key functional traits (wood density (WD), maximum tree height, specific leaf area, nitrogen (N) content of leaves, leaf size and seed mass), demographic rates (relative growth rate (RGR) and mortality rate (MR)) and climatic niche for the 44 most abundant tree species in Spain.3. Demographic data were derived from the Spanish Forest Inventory, a repeated-measures scheme including c. 90 000 permanent plots spread over a territory of c. 500 000 km 2. Functional traits data came primarily from a more detailed forest inventory carried out in Catalonia, NE Spain.4. Our study region covers a wide range of climatic conditions and, not surprisingly, the studied species differed markedly in their climatic niche. Despite that fact, our results showed that the variability in demographic rates across species was much more related to differences in functional traits than to differences in the average climate among species.5. Maximum tree height and, particularly, WD, emerged as key functional traits, and were the best predictors of demographic rates in our study. These two variables also mediated the marginally significant relationship between RGR and MR, suggestive of a weak trade-off between growth and survival.6. The main aspects of our results were not altered by the explicit incorporation of phylogenetic effects, suggesting that the observed relationships are not due to divergences between a few major clades.7. Synthesis. Our study gives support to the notion that variation in functional traits across species allows them to perform largely independently of climatic conditions along environmental gradients.