Deriving Plant Functional Types for Amazonian forests for use in vegetation dynamics models
Deriving Plant Functional Types for Amazonian forests for use in vegetation dynamics models
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DOI：
10.1016/j.ppees.2011.11.001
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发表时间：
2012-01-01
影响因子：
3.6
通讯作者：
Lloyd, Jon
中科院分区：
文献类型：
--
作者：
Fyllas, Nikolaos M.;Quesada, Carlos A.;Lloyd, Jon
我们对植物生理和形态性状之间联系的理解的最新进展为定义植物功能类型(PHI)提供了一种新的方法，用于植被动态的概念和数学模型。在这项研究中，我们使用RAINFOR网络数据库中的数据，旨在通过联合分析亚马逊范围内53个样地的(409)物种丰富度、物种功能特征(10)以及立地土壤和气候条件的数据集，从数字上得出热带森林树木的PHI。我们遵循了一个逐步增加复杂性的数值phi Do定义的过程，从一个简单的物种功能性状的主成分分析开始。随后，我们以两种方式应用了三表(RLQ)多变量排序法：考虑了地块之间的空间自相关性和不考虑地块之间的空间自相关性。在所有情况下，环境对性状变异的贡献都已被分离出来。因此，我们的结果将物种特有的“固有”特征值与环境梯度上的相关物种丰度联系起来。我们根据单位面积叶片干叶质量(M-A)、C、N、P、Ca、K、Mg的叶片浓度、碳同位素识别率(Delta)、树枝木质部密度(Rho(X))和最大树高(H-max)对亚马逊树种进行最终分类，得到四个离散的phi。这些PHI被发现代表了不同的生活史策略，并可以与先前对热带树木行会的经验定义相一致。特别是，确定了两个生态维度：(1)与土壤肥力共同变化的叶片展开维度和(2)与土壤质地共同变化的茎展开维度。通过分析用于定义四个Phi的相同树木的直径生长率，我们发现每个Phi具有不同的总体生长模式。此外，从全流域的森林调查来看，四种PHI相对丰度的差异与林分水平的断面积生长和/或周转率变化有关。这些新派生的PHI应该会增强我们更好地理解亚马逊森林的动态并对其进行建模的能力，这里描述的植物功能特征定义的一般程序可能适用于许多其他生态系统。(C)2011年爱思唯尔股份有限公司。版权所有。
Recent advances in our understanding of the linkages between plant physiological and morphological traits suggest a new means by which to define Plant Functional Types (Phi) for use in conceptual and mathematical models of vegetation dynamics. In this study we used data from the RAINFOR-network database, aiming to numerically derive Phi for tropical forest trees by jointly analysing an Amazon-wide dataset of (409) species abundance, species functional traits (10) and site edaphic and climatic conditions across 53 plots. We followed a stepwise procedure of numerical Phi do definition with increasing complexity, starting from a simple PCA on species functional traits. We subsequently applied a three-table (RLQ) multivariate ordination method in two ways: with and without spatial autocorrelation between plots being taken into account. In all cases the environmental contribution to trait variation had been partialled out. Thus our results link species-specific "inherent" trait values with associated species abundances along environmental gradients. Our final classification of Amazonian tree species based on foliar dry leaf mass per area (M-A), leaf concentrations of C, N, P, Ca, K, Mg, carbon isotopic discrimination (Delta), branch xylem density (rho(X)) and maximum tree height (H-max) yielded four discrete Phi. These Phi were found to represent distinct life-history strategies and can be aligned with previous empirical definitions of tropical tree guilds. In particular, two ecological dimensions are identified: (1) a leaf deployment dimension which co-varies with soil fertility and (2) a stem deployment dimension which co-varies with soil texture. By analysing diameter growth rates of the same trees used to define the four Phi we found each Phi to have a different overall growth pattern. Furthermore, from a Basin-wide forest survey, differences in the relative abundance of the four Phi were related to stand level basal area growth and/or turnover rate variations. These new derived Phi should enhance our ability to better understand and model the dynamics of the Amazon forest, with the general procedure for plant functional trait definition described here potentially applicable to many other ecosystems. (C) 2011 Elsevier GmbH. All rights reserved.