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首页> 外文期刊>Revista rvore >DISTRIBUI??O E RIQUEZA DE ESPéCIES ARBóREAS RARAS EM FRAGMENTOS DE FLORESTA OMBRóFILA MISTA AO LONGO DE UM GRADIENTE ALTITUDINAL, EM SANTA CATARINA
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DISTRIBUI??O E RIQUEZA DE ESPéCIES ARBóREAS RARAS EM FRAGMENTOS DE FLORESTA OMBRóFILA MISTA AO LONGO DE UM GRADIENTE ALTITUDINAL, EM SANTA CATARINA

机译：沿着圣达塔尼的一直梯度混合杂乱林碎片分布与富含稀有树种

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摘要

The present study aimed to analyze how the distribution and the richness of rare tree species occur along an altitudinal gradient, in Araucaria Forests fragments. For this purpose, tree species (diameter at breast height > 5 cm) were sampled in 10 forest fragments located on different altitudinal floors in “Planalto Sul-Catarinense” region, totaling 10 ha of sampling area. The species with only one or two individuals in at least one fragment were classified as rare. The species distribution was verified by a dendrogram constructed through the Jaccard floristic distance index and the UPGMA clustering algorithm. The total species richness per fragment and the number of rare species were compared among montane and upper-montane sub-formation by the Mann-Whitney (U) test. The relationship between altitude and values of total richness and number of rare species in each fragment were determined by simple linear regressions. The results indicated the formation of two groups of rare species, in function of the altitude floor. Despite the fact that total richness of communities decreased with increasing altitude, the number of rare tree species did not significantly change. We conclude that in the “Planalto Sul-Catarinense” region, the fragments of Araucaria Forest have different set of rare tree species according to altitude and that the reduction of the richness of communities with increasing altitudinal floor is not accompanied by a reduction in the number of rare species.
机译：本研究旨在分析稀有树种的分布和丰富性如何沿着一般性梯度发生，在秋天梯度林段。为此目的，在位于“Planalto Sul-Catarinense”区域的不同高度地板上的10个森林片段中取样树种（乳房高度> 5cm的直径），总计10公顷的采样区域。只有一个片段中只有一个或两个个体的物种被归类为罕见。通过jaccard植物距离指数和UPGMA聚类算法构建的树木图来验证物种分布。通过Mann-Whitney（U）测试在蒙氧烷和上半氧烷亚形成中比较了每片段的种类含量和稀有物种数量。通过简单的线性回归测定每个片段中总丰富性和稀有物种数量的高度和数值之间的关系。结果表明，两组稀有物种，在高度地板的功能中。尽管社区的总丰富度随着高度的增加而减少，但稀有树种的数量没有显着变化。我们得出结论，在“Planalto sul-catarinense”区域中，araucaria森林的碎片根据高度，有不同的稀有树种种类，并且随着升高地板的增加，社区的丰富性并不伴随着数量的减少珍稀物种。

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