Species richness of hedgerow habitats in changing agricultural landscapes: are α and γ diversity shaped by the same factors?
Species richness of hedgerow habitats in changing agricultural landscapes: are α and γ diversity shaped by the same factors?
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DOI：
10.1007/s10980-011-9593-3
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发表时间：
2011-05-01
影响因子：
5.2
通讯作者：
Alard, Didier
中科院分区：
文献类型：
--
作者：
Ernoult, Aude;Alard, Didier
了解农业景观中绿篱植物多样性的决定因素仍然是一项艰巨的任务，因为潜在的驱动因素影响了生物多样性组成部分的全部范围（α到γ多样性）。我们调查了法国塞纳河漫滩的84个绿篱中的草本植物群落（高度< 1.5 m）。两种类型的潜在驱动程序的物种丰富度，占景观镶嵌和绿篱网络，记录在绿篱和网站规模。物种丰富度的分布，通过阿尔法绿篱多样性（即栖息地内的平均多样性）和伽玛绿篱多样性（即栖息地的总多样性）的组成部分进行了评估，使用添加剂分区方法，而物种多样性和其潜在的景观驱动力之间的关系，在这两个尺度上使用广义加性模型建模。我们的研究结果表明，伽玛植物篱多样性的景观结构的异质性，这是相关的镶嵌农业用地。在这个尺度上，绿篱网络的配置的内在属性对物种丰富度的影响很弱。阿尔法绿篱多样性也解释了景观变量，占农业马赛克和绿篱网络的配置，但在较小程度上。物种反应的时间滞后显示在两个尺度上，并为两种类型的驱动程序。灭绝或殖民债务可能在这两个尺度上都有表现，而以前做法的残余影响也可能是造成地方尺度上这种模式的原因。我们建议，绿篱管理应考虑到这两个尺度的具体参数。在地方一级，管理行动的目标应是通过扩大缓冲区，减少邻近土地使用的负面影响，而在景观和农场一级，农业环境计划应致力于保护具体的农业土地使用。
Understanding the determinants of hedgerow plant diversity in agricultural landscapes remains a difficult task, because the potential drivers affect the complete range of biodiversity components (alpha to gamma diversity). We surveyed herbaceous plant communities (of a height < 1.5 m) in 84 hedgerows in the Seine river floodplain of France. Two types of potential drivers for species richness, accounting for landscape mosaic and hedgerow network, were recorded at both hedgerow and site scale. The distribution of species richness through the components of alpha hedgerow diversity (i.e. the average diversity within a habitat) and gamma hedgerow diversity (i.e. the total diversity across habitats) were assessed using additive partitioning methods, while the relationship between species diversity and its potential landscape drivers at both scales was modeled using Generalized Additive Models. Our results indicated that gamma hedgerow diversity is explained by the heterogeneity of the landscape structure, which is correlated with the mosaic of agricultural land use. At this scale, intrinsic properties of the configuration of the hedgerow networks have a weak influence on species richness. Alpha hedgerow diversity is also explained by landscape variables, accounting for both the configuration of agricultural mosaics and hedgerow networks, but to a lesser extent. Time lags for species responses are shown at both scales, and for the two types of drivers. Extinction or colonization debt may be indicated at both scales, while the remnant effects of former practices may also be responsible for such patterns at a local scale. We suggest that hedgerow management should take the specific parameters of both scales into account. At a local scale, management actions should aim to decrease the influence of adjacent land use when the impact is negative, through the implementation of extended buffer zones, while at the landscape and farm scales, agri-environmental schemes should be dedicated to the conservation of specific agricultural land uses.