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首页> 外文期刊>Journal of Vegetation Science >Distinct roles of savanna and forest tree species in regeneration under fire suppression in a Brazilian savanna.
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Distinct roles of savanna and forest tree species in regeneration under fire suppression in a Brazilian savanna.

机译：稀树草原和林木物种在巴西稀树草原的灭火抑制下的再生中具有不同的作用。

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Questions: Has fire suppression relaxed barriers to the exchange of species between savanna and forest? Do all species or a subset of species participate in this exchange? Would current vegetation structure persist if fire suppression were to cease? Location: A gallery forest edge in the Cerrado region of central Brazil that burned only once in the past 35 years. Methods: Density of tree seedlings, saplings and adults, leaf area index (LAI), tree basal area and diameter were surveyed in 12, 10 m x 70 m transects centred on and perpendicular to the forest-savanna boundary. Community composition was assessed using non-metric multi-dimensional scaling (NMDS). Results: Basal area and LAI declined substantially from forest to savanna, with an associated shift in species composition. Savanna tree species were nearly absent in the forest, but accounted for the majority of stems in the savanna. In contrast, forest species comprised 14% of adults and more than one-third of juveniles in the savanna. Despite the high diversity of trees (85 species) in the forest, five species play a particularly large role in this initial phase of forest expansion. Reintroduction of fire, however, would result in widespread topkill of juveniles and the majority of adult forest trees, thereby interrupting the succession towards forest. Conclusions: After 35 years during which the site burned only once, the savanna still remains dominated by savanna species. Nevertheless, the dominance of forest juveniles in border and savanna tree communities suggests that with a continued policy of fire suppression, the forest will continue to expand.Digital Object Identifier http://dx.doi.org/10.1111/j.1654-1103.2011.01252.x
机译：问题：灭火是否放松了稀树草原和森林之间物种交换的障碍？所有物种还是物种的子集都参与此交换？如果停止灭火，目前的植被结构会持续存在吗？地点：巴西中部塞拉多地区的画廊森林边缘，在过去35年中仅燃烧过一次。方法：在以森林大草原边界为中心且垂直于森林大草原边界的12个10 m x 70 m样带中，测量树木幼苗，幼树和成年树的密度，叶面积指数（LAI），树木基础面积和直径。使用非度量多维标度（NMDS）评估社区组成。结果：从森林到热带稀树草原，基础面积和LAI大幅下降，物种组成也随之变化。森林中几乎没有稀树草原物种，但占稀树草原茎的大部分。相比之下，大草原中森林物种占成年人的14％，占未成年人的三分之一以上。尽管森林中树木种类繁多（85种），但在森林扩张的初期，其中有五种起着特别重要的作用。然而，重新引入火势将导致少年和大多数成年林木的广泛杀伤力，从而中断向森林的演替。结论：在该场所仅燃烧了35年之后，热带稀树草原仍然是热带稀树草原的主导。尽管如此，边界和热带稀树草原社区中森林少年的主导地位表明，随着持续的灭火政策，森林将继续扩大。数字对象标识符http://dx.doi.org/10.1111/j.1654-1103.2011 .01252.x

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