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首页> 外文期刊>Plant Ecology >How landscape modulators function: woody plant impact on seed dispersalTI How landscape modulators function: woody plant impact on seed dispersal and abiotic filtering
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How landscape modulators function: woody plant impact on seed dispersalTI How landscape modulators function: woody plant impact on seed dispersal and abiotic filtering

机译：景观调节剂如何发挥作用：木本植物对种子传播的影响TI TI景观调节剂如何发挥作用：木本植物对种子传播和非生物过滤的影响

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摘要

The Mediterranean landscape is characterized by a heterogeneous structure: a mosaic of woody plants (trees or shrubs) with scattered patches of herbaceous vegetation. Although the herbaceous and woody patches are adjacent to each other, plant species composition in them is substantially different. This could be attributed to either differences in environmental conditions between patch types (i.e., abiotic filters), or to dispersal limitations caused by the woody plants acting as dispersal filters. In this article, we focus on the relative impact of woody plants, applying these two filter types, in determining plant species composition in Mediterranean woodland. We experimentally manipulated shade and litter cover and examined the effect of each of these factors on plant species composition. We used seed-traps to evaluate seed arrival in the patches, and experimentally removed the shrub canopy to study the effect of the shrub as a physical barrier to seed entry. Results showed that plant species number and composition were not significantly affected by shade and litter manipulation. The number of trapped seeds were significantly higher in the open patches than in the woody patches, and removal of woody plants increased the number of trapped seeds in both open and woody patches, as a result of eliminating the physical obstacle to free seed movement. Our findings show that woody plants affect the herbaceous plant community by influencing seed dispersal, and highlight that they affect other organisms not only by modifying resource availability but also through the creation of a new landscape structure.
机译：地中海景观的特征是异构结构：木本植物（乔木或灌木）的马赛克，散布着草本植物。尽管草本和木质补丁彼此相邻，但其中的植物种类组成却大不相同。这可能是由于补丁类型（即非生物过滤器）之间环境条件的差异，还是由于木本植物充当分散过滤器而造成的分散限制。在本文中，我们将重点关注木本植物的相对影响，应用这两种过滤器类型来确定地中海林地的植物物种组成。我们实验性地操纵了树荫和凋落物的覆盖，并检查了这些因素对植物物种组成的影响。我们使用了种子收集器来评估种子到达斑块中的情况，并实验性地去除了灌木冠层，以研究灌木作为种子进入的物理屏障的影响。结果表明，遮荫和凋落物处理没有显着影响植物的种类和组成。在开放的斑块中，被困种子的数量显着高于木质的斑块，并且由于消除了阻碍种子自由运动的物理障碍，木质植物的清除增加了开放和木本斑块中被困种子的数量。我们的发现表明，木本植物通过影响种子传播而影响草本植物群落，并着重指出，它们不仅通过改变资源利用率，而且通过创建新的景观结构来影响其他生物。

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