Effects of intermediate-scale wind disturbance on composition, structure, and succession in Quercus stands: Implications for natural disturbance-based silviculture
Effects of intermediate-scale wind disturbance on composition, structure, and succession in Quercus stands: Implications for natural disturbance-based silviculture
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DOI：
10.1016/j.foreco.2014.07.003
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发表时间：
2014-10-15
影响因子：
3.7
通讯作者：
Dey, Daniel C.
中科院分区：
文献类型：
--
作者：
Cowden, Merrit M.;Hart, Justin L.;Dey, Daniel C.
森林干扰是指在空间和时间上的离散事件，它们扰乱了生物物理环境，给森林的组成和结构留下了持久的遗产。干扰通常按照空间范围和大小的梯度进行分类，范围从大部分覆盖层被移除的灾难性事件到仅改变当地环境条件的空隙规模的事件。毫无疑问，关于中等规模的扰动事件(即那些过于局部化而不能归类为灾难性的事件，以及太广泛而不能被认为是缺口规模的事件)的数据很少。这项研究的具体目的是量化和比较EF1龙卷风引起的冠层干扰梯度上的冠层结构、林下光照状况、木本植物组成和乔木物种多样性，并分析中等尺度干扰对山地栎林演替轨迹的影响。在对照(无风暴破坏)、轻度或中度损害类别样地之间，多样性度量仅在幼树层中发现显著差异。我们记录了控制级和中度损害级别之间以及中度和轻度损害级别之间截获的标准杆百分率的显著差异(P<；0.01)。在干扰后的三个生长季节，林下光照状况已基本恢复到干扰前的状态。干扰事件主要作为林下植物高级繁殖和中层树干繁殖的释放机制。我们的结果提供了关于这种程度和程度的干扰的定量信息，并可用于指导旨在模拟自然干扰过程的营林系统，这是一种日益流行的管理方法，特别是在公共土地上。(C)2014爱思唯尔B.V.保留所有权利。
Forest disturbances are discrete events in space and time that disrupt the biophysical environment and impart lasting legacies on forest composition and structure. Disturbances are often classified along a gradient of spatial extent and magnitude that ranges from catastrophic events where most of the overstory is removed to gap-scale events that modify local environmental conditions only. Without question, a paucity of data is available on disturbance events of the intermediate scale (i.e. those events too localized to be classed as catastrophic and too widespread to be considered gap scale). The specific objectives of this study were to quantify and compare canopy structure, understory light regimes, woody species composition, and tree species diversity along a gradient of canopy disturbance caused by an EF1 tornado and to analyze the influence of intermediate-scale disturbance on the successional trajectory of an upland Quercus forest. Statistically significant differences in diversity measures between control (no storm damage), light, or moderate damage class plots were only found in the sapling layer. We documented significant differences (P < 0.01) in percent of intercepted PAR between the control and moderate damage classes and between moderate and light classes. Three growing seasons post-disturbance, the understory light regime had largely returned to pre-disturbance conditions. The disturbance event acted primarily as a release mechanism for advanced reproduction in the understory and for stems in the midstory. Our results provide quantitative information on disturbances of this extent and magnitude and can be used to guide silvicultural systems designed to emulate natural disturbance processes, which is an increasingly popular management approach especially on public lands. (C) 2014 Elsevier B.V. All rights reserved.