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首页> 外文期刊>Journal of Biogeography >The influence of vegetation type, soil properties and precipitation on the composition of soil mite and microbial communities at the landscape scale
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The influence of vegetation type, soil properties and precipitation on the composition of soil mite and microbial communities at the landscape scale

机译：景观尺度上植被类型，土壤性质和降水对螨虫和微生物群落组成的影响

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We used a landscape-scale study of birch invasion onto heather moorland to determine the consistency of changes in vegetation type and soil properties and in the community composition of five soil organism groups. Our aim was to determine whether the degree to which soil organisms respond to natural changes and/or induced changes (e.g. changes in land-use type and climate) in habitat is consistent across trophic and taxonomic groups in the context of conservation policies for birch woodland and heather moorland. Mainland Scotland. We sampled mesostigmatid mites, oribatid mites, fungi, bacteria and archaea in adjacent patches of birch woodland (dominated by Betula pubescens) and heather moorland (dominated by Calluna vulgaris) at 12 sites for which annual rainfall ranged between 713 and 2251 mm. Differences in community composition were visualized using non-metric multidimensional scaling based on Bray-Curtis dissimilarities. The factors contributing to differences between habitats within sites were explored using general linear models and those among sites using redundancy analysis. The communities of all groups differed between habitats within sites, but only the oribatid mites and fungi differed consistently between habitats across sites. Within sites, dissimilarity in fungal communities was positively related to the difference in C. vulgaris cover between habitats, whereas dissimilarities in bacteria and archaea were positively related to differences in soil pH and C:N ratio between habitats, respectively. The influence of vegetation type and soil properties differed between groups of soil organisms, albeit in a predictable manner, across the 12 sites. Organisms directly associated with plants (fungi), and organisms with microhabitat and resource preferences (Oribatida) were strongly responsive to changes in habitat type. The response of organisms not directly associated with plants (bacteria, archaea) depended on differences in soil properties, while organisms with less clear microhabitat and resource preferences (Mesostigmata) were not strongly responsive to either vegetation type or soil properties. These results show that it is possible to predict the impact of habitat change on specific soil organisms depending on their ecology. Moreover, the community composition of all groups was related to variation in precipitation within the study area, which shows that external factors, such as those caused by climate change, can have a direct effect on belowground communities.
机译：我们使用景观规模的桦树入侵希瑟高地的研究来确定植被类型和土壤特性以及五个土壤生物群的群落组成变化的一致性。我们的目的是确定在桦木林地保护政策的范围内，营养和生物分类群中土壤生物对生境的自然变化和/或诱发的变化（例如，土地利用类型和气候变化）的响应程度是否一致和希瑟高地。苏格兰大陆。我们在12个站点的年降水量介于713和2251 mm之间的12个站点的白桦林地（以毛桦（Betula pubescens）为主）和石南花高沼地（以una菜（Calluna vulgaris）为主）的相邻斑块中采样了中鼻咽螨，螨类螨，真菌，细菌和古细菌。使用基于Bray-Curtis差异的非度量多维标度，可以直观显示社区组成的差异。使用通用线性模型探索了地点之间生境之间差异的因素，而使用冗余分析则探讨了地点之间的差异。各个地点的生境之间，所有群体的群落都不同，但是，各个地点的生境之间，只有螨虫螨虫和真菌存在差异。在位点内，真菌群落的异质性与生境之间的寻常梭菌盖度呈正相关，而细菌和古细菌的异质性分别与生境之间的土壤pH和C：N比值​​呈正相关。尽管这是可预测的，但是在这12个地点中，植被类型和土壤特性的影响在土壤生物组之间是不同的。与植物（真菌）直接相关的生物以及具有微生境和资源偏好的生物（Oribatida）对生境类型的变化有强烈的反应。与植物不直接相关的生物（细菌，古细菌）的响应取决于土壤特性的差异，而具有微生境和资源偏好（Mesostigmata）的生物对植被类型或土壤特性的响应均不强烈。这些结果表明，可以根据生物生态学预测栖息地变化对特定土壤生物的影响。此外，所有群体的社区构成都与研究区域内的降水变化有关，这表明外部因素，例如由气候变化引起的外部因素，可能对地下社区产生直接影响。

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