Using phylogenetic, functional and trait diversity to understand patterns of plant community productivity.
Using phylogenetic, functional and trait diversity to understand patterns of plant community productivity.
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DOI：
10.1371/journal.pone.0005695
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发表时间：
2009-05-27
期刊：
影响因子：
3.7
通讯作者：
Oakley TH
中科院分区：
文献类型：
--
作者：
Cadotte MW;Cavender-Bares J;Tilman D;Oakley TH
20年的研究表明，增加植物多样性会提高社区生产力，其前提是增加功能多样性，从而能够获得更多的可用资源。因此，理解允许物种划分资源的表型属性对于解释多样性-生产力关系至关重要。这里我们使用的数据来自一个长期的实验（Cedar Creek，MN），并比较生产力在多大程度上由七种类型的功能变异的社区指标解释：1）物种丰富度，2）10个个体性状的变化，3）功能群丰富度，4）基于距离的功能多样性度量，5）分层多变量聚类方法，6）非度量多维标度方法，和7）系统发育多样性度量，将连接群落成员的系统发育分支长度相加，并且可以是生态差异的替代物。虽然大多数这些多样性措施提供了显着的解释生产力的变化，固氮和系统发育多样性的存在是两个最好的解释变量。此外，一个统计模型，其中包括一个固氮剂的存在下，种子重量和系统发育多样性是一个更好的解释比其他模型的社区生产力。物种之间的进化关系似乎可以解释草地生产力的模式。此外，这些结果表明，物种之间的功能差异涉及一套复杂的性状，也许系统发育关系提供了一个更好的衡量物种之间的多样性，有助于生产力比个人或小群体的性状。
Two decades of research showing that increasing plant diversity results in greater community productivity has been predicated on greater functional diversity allowing access to more of the total available resources. Thus, understanding phenotypic attributes that allow species to partition resources is fundamentally important to explaining diversity-productivity relationships. Here we use data from a long-term experiment (Cedar Creek, MN) and compare the extent to which productivity is explained by seven types of community metrics of functional variation: 1) species richness, 2) variation in 10 individual traits, 3) functional group richness, 4) a distance-based measure of functional diversity, 5) a hierarchical multivariate clustering method, 6) a nonmetric multidimensional scaling approach, and 7) a phylogenetic diversity measure, summing phylogenetic branch lengths connecting community members together and may be a surrogate for ecological differences. Although most of these diversity measures provided significant explanations of variation in productivity, the presence of a nitrogen fixer and phylogenetic diversity were the two best explanatory variables. Further, a statistical model that included the presence of a nitrogen fixer, seed weight and phylogenetic diversity was a better explanation of community productivity than other models. Evolutionary relationships among species appear to explain patterns of grassland productivity. Further, these results reveal that functional differences among species involve a complex suite of traits and that perhaps phylogenetic relationships provide a better measure of the diversity among species that contributes to productivity than individual or small groups of traits.