Interactions among trees: A key element in the stabilising effect of species diversity on forest growth
Interactions among trees: A key element in the stabilising effect of species diversity on forest growth
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DOI：
10.1111/1365-2435.13257
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发表时间：
2019-02-01
影响因子：
5.2
通讯作者：
Drobyshev, Igor
中科院分区：
文献类型：
--
作者：
Aussenac, Raphael;Bergeron, Yves;Drobyshev, Igor
越来越多的证据表明，物种多样性增加了森林生长的时间稳定性。这种多样性的稳定作用主要归因于物种对波动环境条件的反应差异。个体之间的相互作用也可以通过增加树木生长的平均值和减少方差来促进多样性的稳定作用，然而，这一点从未直接得到证明。我们使用加拿大东部温带和北方混交林的树轮宽度年表来确定个体之间的相互作用在多样性对森林生长的稳定作用中的作用。利用邻体竞争指数和混合模型，比较了种间和种内相互作用对树木生长的影响，发现种间相互作用对树木生长的影响小于种内相互作用。我们还发现，种间相互作用可以缓冲树木对干旱的响应，从而降低树木生长的方差，表明多样性可以通过个体间的相互作用来提高树木生长的均值，降低树木生长的方差。因此，我们证明了个体之间的相互作用在稳定多样性对森林生长的影响中发挥了作用，在这样做的过程中，我们揭示了保险假说的其他机制。
There is mounting evidence that species diversity increases the temporal stability of forest growth. This stabilising effect of diversity has mainly been attributed to species differences in their response to fluctuating environmental conditions. Interactions among individuals could also contribute to the stabilising effect of diversity by increasing the mean and reducing the variance of tree growth, however, this has never been directly demonstrated.We used tree-ring width chronologies from temperate and boreal mixed stands of Eastern Canada to identify the role of interactions among individuals in the stabilising effect of diversity on forest growth. Using neighbourhood competition index and a mixed model, we compared the effect of interspecific and intraspecific interactions on the mean and the variance of tree growth.We found that interspecific interactions are less detrimental to tree growth than intraspecific interactions. We also found that interspecific interactions buffer tree response to drought and thereby reduce the variance of tree growth.Our results indicate diversity may increase the mean and reduce the variance of tree growth through interactions among individuals. Thus, we demonstrate interactions among individuals play a role in the stabilising effect of diversity on forest growth, and in doing so, we bring to light other mechanisms of the insurance hypothesis.