Thresholds of biodiversity and ecosystem function in a forest ecosystem undergoing dieback.
Thresholds of biodiversity and ecosystem function in a forest ecosystem undergoing dieback.
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DOI：
10.1038/s41598-017-06082-6
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发表时间：
2017-07-28
影响因子：
4.6
通讯作者：
Fuller L
中科院分区：
文献类型：
--
作者：
Evans PM;Newton AC;Cantarello E;Martin P;Sanderson N;Jones DL;Barsoum N;Cottrell JE;A'Hara SW;Fuller L
生态阈值代表着生态特性的快速变化点，具有重大的科学和社会意义。然而，很少有研究集中于对温带陆地生态系统中阈值的发生进行经验测试。为了解决这一知识差距，我们测试了一些生物多样性、生态系统功能和生态系统状况指标是否表现出对森林枯死梯度的反应阈值，该梯度是指活树相对于没有最近枯死的区域的断面积的变化。在一个温带森林生态系统中，利用12个重复研究区域对枯萎病的梯度进行了采样。我们的结果为生物多样性的几个阈值(即外生菌根真菌、附生地衣和地面植物的物种丰富度)、生态条件(例如草皮高度、适宜的苗木丰富度)和生态系统功能的单一阈值(即土壤呼吸速率)提供了新的证据。对这些阈值的机制进行了探讨。随着气候引起的森林枯萎在全球范围内的规模和速度都在增加，这些结果表明阈值反应可能会变得越来越普遍。
Ecological thresholds, which represent points of rapid change in ecological properties, are of major scientific and societal concern. However, very little research has focused on empirically testing the occurrence of thresholds in temperate terrestrial ecosystems. To address this knowledge gap, we tested whether a number of biodiversity, ecosystem functions and ecosystem condition metrics exhibited thresholds in response to a gradient of forest dieback, measured as changes in basal area of living trees relative to areas that lacked recent dieback. The gradient of dieback was sampled using 12 replicate study areas in a temperate forest ecosystem. Our results provide novel evidence of several thresholds in biodiversity (namely species richness of ectomycorrhizal fungi, epiphytic lichen and ground flora); for ecological condition (e.g. sward height, palatable seedling abundance) and a single threshold for ecosystem function (i.e. soil respiration rate). Mechanisms for these thresholds are explored. As climate-induced forest dieback is increasing worldwide, both in scale and speed, these results imply that threshold responses may become increasingly widespread.
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影响因子：
2.7
作者：
Allen, Craig D.;Breshears, David D.;McDowell, Nate G.
通讯作者：
McDowell, Nate G.
DOI：
10.1073/pnas.0802430105
发表时间：
2008-09-23
影响因子：
11.1
作者：
Dakos, Vasilis;Scheffer, Marten;Held, Hermann
通讯作者：
Held, Hermann
影响因子：
4.8
作者：
Dantas, Vinicius de L.;Batalha, Marco A.;Pausas, Juli G.
通讯作者：
Pausas, Juli G.
影响因子：
3.7
作者：
Allen, Craig D.;Macalady, Alison K.;Cobb, Neil
通讯作者：
Cobb, Neil
影响因子：
3.7
作者：
Cantarello, Elena;Newton, Adrian C.
通讯作者：
Newton, Adrian C.