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Effect of edge structure on the flux of species into forest interiors

机译：边缘结构对物种通向森林内部通量的影响

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A key goal of conservation biology is to prevent the spread of exotic species. Previous work on exotic invasion has two limitations: (1) the lack of a spatially explicit approach and (2) a primary focus on the net effect of invasion by examining invasive species already present in the community. We address these limitations by focusing on the arrival of a potential invader into a community and use a spatially explicit approach to quantify the flow of seeds from tbe surrounding landscape into the interior of a forest. We hypothesize size that the structure of forest-edge vegetation influences how the edge mediates seed flux. To test our hypothesis, we experimentally altered vegetation structure within 20 m of the edge to create two edge treatments: thinned and intact. We quantified the flux of seeds moving into the forest interior across the two treatments. We used seed traps randomly arrayed on transects from 5 to 50 m into the forest. More seeds crossed the thinned treatment than crossed the intact treatment to reach the forest interior. In addition, seeds that crossed the thinned treatment dispersed further into the forest than those that crossed the intact treatment. These results were consistent throughout the period of maximum autumn dispersal, including periods before and after leaf drop. Our results show that the structure of vegetation on the edge interacts with the flux of wind-dispersed seed across the edge. We demonstrated that an edge with intact vegetation can function as a physical barrier to seed dispersal. Therefore, the structure of vegetation on edges can influence the function of edges as barriers to seed flux into the forest interior. [References: 40]
机译：保护生物学的主要目标是防止外来物种的传播。先前关于外来入侵的工作有两个局限性：（1）缺乏空间上明确的方法;（2）通过检查社区中已经存在的入侵物种，主要关注入侵的净效应。我们通过关注潜在入侵者进入社区来解决这些局限，并使用空间明确的方法来量化种子从周围景观到森林内部的流动。我们假设森林边缘植被结构影响边缘如何介导种子通量的大小。为了检验我们的假设，我们通过实验改变了边缘20 m内的植被结构，以创建两种边缘处理：变薄和完整。我们对两种处理中种子进入森林内部的流量进行了量化。我们使用了随机排列在5至50 m到森林中的样带上的种子陷阱。通过稀疏处理的种子比通过完整处理的种子要多得多。此外，经过稀疏处理的种子比经过完整处理的种子更分散到森林中。在整个秋季最大扩散期间，包括在掉落前后，这些结果都是一致的。我们的结果表明，边缘的植被结构与风传播的种子在边缘的通量相互作用。我们证明了具有完整植被的边缘可以充当种子扩散的物理屏障。因此，边缘植物的结构可以影响边缘的功能，阻碍种子通入森林内部。 [参考：40]

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