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首页> 美国卫生研究院文献>Ecology and Evolution >Plant community assembly in suburban vacant lots depends on earthmoving legacy habitat connectivity and current mowing frequency
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Plant community assembly in suburban vacant lots depends on earthmoving legacy habitat connectivity and current mowing frequency

机译：郊区空地的植物群落组装取决于土方遗留物栖息地的连通性和当前的割草频率

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In suburban regions, vacant lots potentially offer significant opportunities for biodiversity conservation. Recently, in Japan, due to an economic recession, some previously developed lands have become vacant. Little is known, however, about the legacy of earlier earthmoving, which involves topsoil removal and ground leveling before residential construction, on plant community composition in such vacant lots. To understand (dis)assembly processes in vacant lots, we studied 24 grasslands in a suburban region in Japan: 12 grasslands that had experienced earthmoving and 12 that had not. We surveyed plant community composition and species richness, and clarified compositional turnover (replacement of species) and nestedness (nonrandom species loss) by distance‐based β‐diversities, which were summarized by PCoA analysis. We used piecewise structural equation modeling to examine the effects of soil properties, mowing frequency, past and present habitat connectivities on compositional changes. As a result, past earthmoving, mowing frequency, soil properties, and past habitat connectivity were found to be the drivers of compositional turnover. In particular, we found legacy effects of earthmoving: earthmoving promoted turnover from native grassland species to weeds in arable lands or roadside by altering soil properties. Mowing frequency also promoted the same turnover, implying that extensive rather than intensive mowing can modify the negative legacy effects and maintain grassland species. Decrease in present habitat connectivity marginally enhanced nonrandom loss of native grassland species (nestedness). Present habitat connectivity had a positive effect on species richness, highlighting the important roles of contemporary dispersal. Our study demonstrates that community assembly is a result of multiple processes differing in spatial and temporal scales. We suggest that extensive mowing at local scale, as well as giving a high conservation priority to grasslands with high habitat connectivity at regional scale, is the promising actions to maintain endangered native grassland species in suburban landscapes with negative legacy effects of earthmoving.
机译：在郊区，空地可能为生物多样性保护提供重要机会。最近，在日本，由于经济衰退，一些先前开发的土地变得空置。然而，人们对早期土方工程的遗留知之甚少，土方工程涉及在这种空地中的植物群落组成，涉及在住宅建设之前清除表土和平整土地。为了了解闲置地的（拆卸）过程，我们研究了日本郊区的24个草原：12个经历过土方运动的草原和12个没有经历过土方运动的草原。我们调查了植物群落组成和物种丰富度，并通过基于距离的β多样性阐明了组成更新（物种替换）和嵌套（非随机物种损失），并通过PCoA分析对其进行了总结。我们使用分段结构方程模型来研究土壤性质，割草频率，过去和现在的栖息地连通性对成分变化的影响。结果，发现过去的土方移动，割草频率，土壤特性和过去的栖息地连通性是成分更新的驱动力。特别是，我们发现了土方转移的遗留效应：土方转移通过改变土壤特性，促进了从天然草地物种到耕地或路边杂草的周转。割草频率也促进了相同的周转，这意味着广泛而不是集约化的割草可以改变负面的传统影响并维持草地物种。当前栖息地连通性的降低在一定程度上增强了天然草原物种的非随机丧失（嵌套）。当前的栖息地连通性对物种丰富度产生了积极影响，突显了当代传播的重要作用。我们的研究表明，社区组装是空间和时间尺度不同的多个过程的结果。我们建议，在地方范围内进行大规模割草，以及在区域范围内高度重视具有高栖息地连通性的草地，是在郊区景观中维持濒临灭绝的原生草原物种而对土方造成负面影响的有前途的行动。

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