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首页> 外文期刊>Southeastern naturalist >Effects of prescribed fire on the buried seed bank in mixed-hardwood forests of the southern appalachian mountains
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Effects of prescribed fire on the buried seed bank in mixed-hardwood forests of the southern appalachian mountains

机译：规定的火种对阿巴拉契亚山脉南部混合硬木林中埋藏的种子库的影响

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This study characterizes the seed bank prior to and immediately following dormant-season prescribed fire in mature, mixed-Quercus spp. (oak) forests in the southern Appalachian Mountains. Thirty samples from the litter/duff (LD) and the top 5 cm of the mineral soil (MS) were collected from five 5-ha burn units (6 plots per experimental unit) before and immediately after low-intensity prescribed fires, where maximum fire temperatures varied from <79 to 316°C. A split-plot ANOVA and multi-response permutation procedures (MRBP) were utilized to assess the effects of burn treatment (pre- or post-fire) and seed bank layer (LD and MS) on the diversity and density of the buried seed bank. An average of 471 emergents/m~2 was observed in the buried seed bank comprising 133 identifiable taxa. No differences in total seed-bank density, Shannon-Weiner's diversity index (H') or overall species composition between pre- and post-fire sampling or between the LD and MS layers were observed. Species richness (S) of the seed bank, however, was slightly greater pre-fire than post-fire, regardless of layer. Similarity, as defined by S?renson's index, of species common to the seed bank and aboveground forest understory was low, with a slight increase in S?renson's index observed during post-fire sampling of the seed bank and aboveground vegetation. Although we observed only negligible effects of a once-applied, low-intensity prescribed fire on the buried seed bank, the effects of a low-intensity prescribed fire management regime-one that involves repeated low intensity burns-on the buried seed bank are unknown and should be a focus of future studies across mixed-oak forests in the eastern US.
机译：这项研究的特点是在成熟的混合栎属植物休眠季节开火之前和之后立即进行种子库的鉴定。阿巴拉契亚山脉南部的（橡树）森林。在低强度规定的火灾发生之前和之后，从五个5公顷的烧毁单位（每个实验单位6个地块）中收集了来自垃圾/粉尘（LD）和矿物土壤顶部5厘米（MS）的30个样本。火灾温度从<79到316°C不等。使用分裂图方差分析和多响应置换程序（MRBP）来评估燃烧处理（火灾前或后）和种子库层（LD和MS）对埋藏种子库的多样性和密度的影响。在埋藏的种子库中，平均可观察到471个突发/ m〜2，其中包括133个可识别的类群。在火前和火后采样之间或LD和MS层之间，未观察到总种子库密度，Shannon-Weiner多样性指数（H'）或总体物种组成的差异。然而，无论层数如何，种子库的物种丰富度（S）均比烧后的略高。种子库和地上林下种共有的物种的相似性（由Srenson指数定义）很低，在种子库和地上植被的火灾后采样期间，Srenson指数略有增加。尽管我们只观察到一次应用低强度明火对掩埋种子库的影响可忽略不计，但是低强度规定火管理方案（涉及反复低强度燃烧）对埋入种子库的影响尚不清楚并且应该成为未来在美国东部混合橡树林中进行研究的重点。

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