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首页> 外文期刊>Ecological research >Recovery of the herbaceous layer in the young silver birch and black alder stands that developed spontaneously after a forest fire
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Recovery of the herbaceous layer in the young silver birch and black alder stands that developed spontaneously after a forest fire

机译：森林火灾后自发形成的年轻白桦林和黑al木林中的草层恢复

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The studies, which were conducted in southern Poland, focused on the recovery of the herb layer in 17-year-old post-fire silver birch and black alder forests. Although both types of stands, which are of the same age, developed spontaneously, the alder stands occupied damper sites (with thicker A horizons that survived the fire) than those in the birch forests. We surveyed the migration rates of 44 woodland species, primarily ancient woodland indicators, into both forests and the potential differences in these rates depending on their moisture regime and the community type represented by unburned forests, which were treated as the source of the woodland species pool. Additionally, the role of local depressions with high humidity that were covered by post-fire alder woods in the colonization process, as well as species survivorship and recolonisation, were estimated. Woodland species showed diverse migration paces among the sites; most of them migrated faster on more fertile sites with a higher humidity. Small patches of post-fire alder woods contributed to the recolonisation process since many woodland species in the herb layer survived the fire due to its high humidity, which inhibited the intensity of the forest fire. The recovery of woodland species in post-fire woods is the combined effect of regeneration, which relies on autochthonic propagules, and secondary succession, which is based on allochthonic propagules. Local depressions, which provide refuges for fire-sensitive, dispersal-limited species, contribute to their survivorship and thus to the successive recovery of herbaceous layers after a fire.
机译：在波兰南部进行的研究集中在17年生火后白桦和黑black木森林中草药层的恢复上。尽管两种年龄相同的林分自发形成，但al木林分比桦树林更易受潮（在火中幸存的A层较厚）。我们调查了44种林地物种（主要是古代林地指标）向两种森林的迁移速率，以及这些速率的潜在差异取决于它们的水分状况和未燃烧森林所代表的群落类型（被视为林地物种库的来源） 。此外，估计了火后al木在定居过程中覆盖的局部高湿度洼地的作用，以及物种生存和重新定殖的作用。林地物种在各个地点之间的迁移速度各不相同；它们中的大多数在湿度更高，肥沃的地方迁移更快。火灾后al木的小片块有助于重新定殖，因为草本层中的许多林地物种由于其高湿度而幸免于难，从而抑制了森林大火的强度。火后森林中林地物种的恢复是再生的综合作用，其依赖于自声子繁殖体，而次生演替则基于异源性繁殖体。局部洼地为对火敏感的，传播受限的物种提供了庇护，有助于它们的生存，并因此有助于在火灾后连续恢复草本层。

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