Consistent, small effects of treefall disturbances on the composition and diversity of four Amazonian forests.
Consistent, small effects of treefall disturbances on the composition and diversity of four Amazonian forests.
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DOI：
10.1111/1365-2745.12529
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发表时间：
2016-03
期刊：
影响因子：
--
通讯作者：
Phillips OL
中科院分区：
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作者：
Baker TR;Vela Díaz DM;Chama Moscoso V;Navarro G;Monteagudo A;Pinto R;Cangani K;Fyllas NM;Lopez Gonzalez G;Laurance WF;Lewis SL;Lloyd J;Ter Steege H;Terborgh JW;Phillips OL
了解潮湿的热带森林的树落干扰事件的恢复力是很重要的了解的机制，物种共存的基础，并预测这些生态系统的未来组成。在这里，我们测试是否亚马逊森林的功能组成的变化决定了他们的抗干扰能力。我们研究了亚马逊河流域四个森林的自然树倒干扰事件的遗产，这些森林在功能组成上有很大的不同。我们比较了55个一公顷长期森林清查地块内先前扰动和未扰动的20 x 20 m子地块中所有直径2-10厘米的独立木质茎的组成和多样性。总体而言，干扰后茎数增加，物种和功能组成转移到有利于轻木质，小种子类群。α多样性增加，但β多样性不受干扰，在所有四个森林。然而，功能组成和α多样性对干扰的反应变化很小（2 - 4%，取决于参数），并且森林之间相似。 合成.这项研究表明，亚马逊森林的功能组成的变化不会导致这些森林的反应树落干扰的大的差异，总体而言，这些事件有一个小的作用，在维持这些生态系统的多样性。
Understanding the resilience of moist tropical forests to treefall disturbance events is important for understanding the mechanisms that underlie species coexistence and for predicting the future composition of these ecosystems. Here, we test whether variation in the functional composition of Amazonian forests determines their resilience to disturbance. We studied the legacy of natural treefall disturbance events in four forests across Amazonia that differ substantially in functional composition. We compared the composition and diversity of all free‐standing woody stems 2–10 cm diameter in previously disturbed and undisturbed 20 × 20 m subplots within 55, one‐hectare, long‐term forest inventory plots. Overall, stem number increased following disturbance, and species and functional composition shifted to favour light‐wooded, small‐seeded taxa. Alpha‐diversity increased, but beta‐diversity was unaffected by disturbance, in all four forests. Changes in response to disturbance in both functional composition and alpha‐diversity were, however, small (2 – 4% depending on the parameter) and similar among forests. Synthesis. This study demonstrates that variation in the functional composition of Amazonian forests does not lead to large differences in the response of these forests to treefall disturbances, and overall, these events have a minor role in maintaining the diversity of these ecosystems.