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首页> 外文期刊>Acta Botanica Brasilica >Spatial patterns of two co-occurring savanna and forest tree species in a dense fire-protected savanna fragment
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Spatial patterns of two co-occurring savanna and forest tree species in a dense fire-protected savanna fragment

机译：密集的防火稀树草原片段中两种同时存在的稀树草原和森林树木物种的空间格局

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ABSTRACT Savanna-forest transition under fire-exclusion could be explained by differential competitive performance of savanna and forest species under shading/fire-exclusion. Aiming to understand strategies related to either habitat affinity, we investigated spatial patterns of a savanna and a forest species in a fire-protected savanna. We predicted that: savanna species would have lower abundance than the forest species due to a restriction in the number of open microsites; segregation of size classes and a trend from clumping to regularity with size for forest species due to absence of microsite limitation and intra-specifc competition; and spatial association and increasing clustering with size for savanna species due to microsite limitation. To test these predictions, we described spatial patterns of plants in two size classes in three plots of 0.5 ha. We analyzed spatial patterns and associations of size classes using SADIE methodology. Different from what we expected, both species were more abundant among the studied plots and exhibited an increasing aggregation from small to large size classes. We also found a positive spatial association between size classes of both. These results suggest that both savanna and forest species produce similar spatial patterns independently of habitat affinity. We discuss the possible processes responsible for the observed patterns.
机译：摘要稀疏/大火条件下稀树草原和森林物种竞争能力的差异可以解释大火-大火排除下的稀树草原-森林过渡。为了了解与任一生境亲和力有关的策略，我们研究了防火大草原中热带草原和森林物种的空间格局。我们预测：由于开放的微型站点数量的限制，稀树草原物种的丰度将比森林物种低;大小等级的隔离，以及由于没有小站点限制和种内竞争，森林物种的大小从丛集到规则的趋势;物种的空间关联性以及热带稀树草原物种由于大小限制而聚集的现象。为了检验这些预测，我们在0.5公顷的三个图中描述了两种大小类别的植物的空间格局。我们使用SADIE方法分析了空间类别的空间格局和关联。与我们的预期不同，在所研究的样地中，这两种物种都更加丰富，并且从小到大的类别都表现出越来越大的聚集。我们还发现两者的尺寸类别之间存在正的空间关联。这些结果表明，稀树草原和森林物种均产生相似的空间格局，而与栖息地的亲和力无关。我们讨论了负责观察模式的可能过程。

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