Tree aboveground carbon storage correlates with environmental gradients and functional diversity in a tropical forest.
Tree aboveground carbon storage correlates with environmental gradients and functional diversity in a tropical forest.
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树木地上碳储存与热带森林的环境梯度和功能多样性相关
DOI：
10.1038/srep25304
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发表时间：
2016-06-09
影响因子：
4.6
通讯作者：
Ye W
中科院分区：
文献类型：
--
作者：
Shen Y;Yu S;Lian J;Shen H;Cao H;Lu H;Ye W
热带森林在全球碳(C)循环中扮演着不成比例的重要角色，但当地环境和功能多样性如何调节树木地上C储存仍不清楚。研究了环境、功能优势度和多样性三个因素对中国鼎湖山20公顷样地碳贮量的影响。碳贮量有较大的细微尺度变化。这三个组分对碳贮量的调控作用显著，但性状的显性和多样性与碳贮量的方向不同。优势度和多样性的结构方程模型分别解释了碳贮量34%和32%的变异。环境可以解释26%-44%的优势度和多样性变化。回归模型中的显性和多样性解释了碳贮量变化的相似比例，在加入环境后，它们得到了改善。最大直径的多样性对碳贮量的预测效果最好。互补性和选择效应对碳贮量的贡献是同时存在的，且具有相似的重要性。这些模型解开了这三个组分与碳储存之间的复杂关系，并建立了一个框架，以显示当地环境对碳储存的直接和间接影响(通过优势和多样性)。我们的结论是，当地环境对调节功能多样性和碳储存是重要的。
Tropical forests play a disproportionately important role in the global carbon (C) cycle, but it remains unclear how local environments and functional diversity regulate tree aboveground C storage. We examined how three components (environments, functional dominance and diversity) affected C storage in Dinghushan 20-ha plot in China. There was large fine-scale variation in C storage. The three components significantly contributed to regulate C storage, but dominance and diversity of traits were associated with C storage in different directions. Structural equation models (SEMs) of dominance and diversity explained 34% and 32% of variation in C storage. Environments explained 26–44% of variation in dominance and diversity. Similar proportions of variation in C storage were explained by dominance and diversity in regression models, they were improved after adding environments. Diversity of maximum diameter was the best predictor of C storage. Complementarity and selection effects contributed to C storage simultaneously, and had similar importance. The SEMs disengaged the complex relationships among the three components and C storage, and established a framework to show the direct and indirect effects (via dominance and diversity) of local environments on C storage. We concluded that local environments are important for regulating functional diversity and C storage.