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Forest edge in the Brazilian Atlantic forest: drastic changes in tree species assemblages

机译：巴西大西洋森林的森林边缘：树木物种组合的急剧变化

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摘要

In this study we surveyed all trees ≥ 10 cm diameter at breast height within 20 0.1 ha plots in a 3,500 ha forest fragment, surrounded by sugar cane fields, of the Brazilian Atlantic forest to compare tree species assemblages at the forest edge (0-100 m into forest) vs forest interior ( > 200 m). Plots were perpendicular to the margin. The mean number of tree species was significantly higher in the forest interior (35.4 +- SD 7.1 vs 18.4 +- SD 4.4). In addition, forest edge differed from interior in the proportion of shade-tolerant, emergent, large/very large-fruited species, and large-seeded tree species. Among the 134 tree species recorded, 24% were exclusive to the forest edge and 57% to the forest interior. Our results suggest that both the current system of protected areas and archipelagos of small fragments (1) tend to retain only a subset of the original flora, (2) will converge in terms of floristic and ecological composition (biotic simplification and homogenization), and (3) will lose rare and threatened tree species.
机译：在这项研究中，我们调查了巴西大西洋森林中3500公顷被甘蔗田包围的3500公顷森林片段中20公顷土地上胸高≥10 cm的所有树木，以比较森林边缘的树种组合（0-100 m进入森林）与森林内部（> 200 m）。情节垂直于边缘。森林内部树木的平均数量显着更高（35.4±SD 7.1与18.4±SD 4.4）。此外，森林边缘与内陆的区别在于耐荫，出苗，大/非常大的果树种和大种子的树种。在记录的134种树种中，有24％仅在森林边缘，而57％仅在森林内部。我们的结果表明，当前的保护区系统和小片段群岛（1）往往仅保留原始植物群的一个子集，（2）在植物区系和生态成分（生物简化和均质化）方面将趋于一致，并且（3）将失去珍稀和受威胁的树种。

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