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Effects of the surrounding matrix on tree recruitment in Amazonian forest fragments

机译：周围基质对亚马逊森林碎片树木采伐的影响

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Little is known about how the surrounding modified matrix affects tree recruitment infragmented forests. We contrasted effects of two different matrix types, Vismia- and Cecropia-dominated regrowth, on recruitment of pioneer tree species in forest fragments in central Amazonia. Our analyses were based on 22, 1-ha plots in seven experimental forest fragments ranging in size from I to 100 ha. By 13 to 17 years after fragmentation, the population density of pioneer trees was significantly higher in plots surrounded by Vismia regrowth than in plots surrounded by Cecropia regrowth, and the species composition and dominance of pioneers differed markedly between the two matrix types. Cecropia sciadophylla was the most abundant pioneer in fragments surrounded by Cecropia regrowth (constituting nearly 50% of all pioneer trees), whereas densities of species in Vismia-surrounded fragments were distributed more evenly. Thus the surrounding matrix had a strong influence on patterns of tree recruitment in Amazonian forest fragments.
机译：人们对周围的改良基质如何影响树木采伐后的退化森林一无所知。我们比较了两种不同的基质类型，以Vismia和Cecropia为主的再生长，对亚马逊地区中部森林碎片中先锋树种的募集。我们的分析基于七个实验性森林碎片（面积从1到100公顷）中的22个1公顷土地。破碎后的13至17年，在Vismia再生长的土地上，先锋树的种群密度比在Cecropia再生长的土地上的先锋树的种群密度显着更高，并且两种基质类型之间先锋树的物种组成和优势显着不同。在被Cecropia再生长所包围的碎片中，Cecropia sciadophylla是最丰富的先驱（占所有先驱树的近50％），而在Vismia环绕的碎片中，物种的密度分布更均匀。因此，周围的矩阵对亚马逊森林碎片中的树木募集模式有很大的影响。

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