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首页> 外文期刊>International Journal of Biodiversity >Quantifying Effects of Spatial Heterogeneity of Farmlands on Bird Species Richness by Means of Similarity Index Pairwise
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Quantifying Effects of Spatial Heterogeneity of Farmlands on Bird Species Richness by Means of Similarity Index Pairwise

机译：利用相似度指数成对定量分析农田空间异质性对鸟类物种丰富度的影响

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Many studies have shown how intensification of farming is the main cause of loss biodiversity in these environments. During the last decades, agroecosystems in Europe have changed drastically, mainly due to mechanization of agriculture. In this work, species richness in bird communities was examined on a gradient of spatial heterogeneity of farmlands, in order to quantify its effects. Four categories of farmland spatial heterogeneity were defined, based on landscape and landuse parameters. The impact of features increasing the spatial heterogeneity was quantified comparing the similarity indexes between bird communities in several farmlands of Central Italy. The effects of environmental variables on bird richness were analyzed using GLM. The results highlighted that landscape features surrogates of high nature values (HNVs) of farmlands can increase more than 50% the bird species richness. The features more related to bird richness were hedgerows, scattered shrubs, uncultivated patches, and powerlines. The results confirm that the approach based on HNV for evaluating the farmlands is also suitable in order to study birds’ diversity. However, some species are more sensitive to heterogeneity, while other species occupy mainly homogeneous farmlands. As a consequence, different conservation methods must be considered for each farmland bird species.
机译：许多研究表明，在这些环境中，集约化耕作是造成生物多样性丧失的主要原因。在过去的几十年中，欧洲的农业生态系统发生了翻天覆地的变化，主要是由于农业机械化。在这项工作中，在农田空间异质性的梯度上研究了鸟类群落中物种的丰富度，以便量化其影响。基于景观和土地利用参数，定义了四类农田空间异质性。通过比较意大利中部几个农田的鸟类群落之间的相似性指标，量化了增加空间异质性特征的影响。使用GLM分析环境变量对禽类丰富度的影响。结果强调，具有高自然价值（HNV）的农田地貌特征可以增加鸟类物种丰富度的50％以上。与鸟类丰富度有关的特征是树篱，灌木丛散布，未耕作的斑块和电力线。结果证实，基于HNV的农田评估方法也适用于研究鸟类的多样性。但是，有些物种对异质性更敏感，而其他物种则主要占据同质农田。因此，必须为每种农田鸟类考虑不同的保护方法。

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