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首页> 外文期刊>Soil Biology & Biochemistry >Tree identity surpasses tree diversity in affecting the community structure of oribatid mites (Oribatida) of deciduous temperate forests.
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Tree identity surpasses tree diversity in affecting the community structure of oribatid mites (Oribatida) of deciduous temperate forests.

机译：在影响落叶温带森林的oribatid螨（Oribatida）的群落结构方面，树的身份超越了树的多样性。

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摘要

The role of tree diversity and identity as determinants of soil animal community structure is little understood. In a mature deciduous forest dominated by beech we identified clusters of one, two and three tree species of beech, ash and lime allowing to investigate the role of tree species diversity and identity on the density and community structure of oribatid mites. To relate oribatid mite community structure to environmental factors we measured leaf litter input, fine root biomass, mass of organic layers, topsoil pH and C and N content. We expected oribatid mite density to increase with increasing tree diversity, but we expected the effects of tree species identity to override effects of tree diversity. Further, we hypothesized the density of oribatid mites to be reduced by the presence of beech but increased by the presence of lime and ash. As expected tree diversity little affected oribatid mite communities, whereas tree species identity strongly altered density and community structure of oribatid mites. However, in contrast to our expectations the density of oribatid mites was highest in presence of beech indicating that many oribatid mite species benefit from the presence of recalcitrant litter forming thick organic layers. Especially Oppioidea benefited from the presence of beech presumably due to an increased availability of food resources such as fungi and nematodes. Lower density of oribatid mites in monospecific clusters of lime and ash suggests that oribatid mites did not benefit from high quality litter of these species. Notably, large and strongly sclerotized oribatid mite species, such as Steganacarus magnus and Chamobates voigtsi, benefited from the presence of ash and lime. Presumably, these large species better resist harsh microclimatic conditions in shallow organic layers.
机译：树木多样性和身份作为土壤动物群落结构决定因素的作用鲜为人知。在一个以山毛榉为主导的成熟落叶林中，我们鉴定出一，二，三棵山毛榉，水曲柳和石灰的树丛，从而研究了树种多样性和同一性对乌龟螨的密度和群落结构的作用。为了将臭螨螨的群落结构与环境因素联系起来，我们测量了凋落物的输入，细根生物量，有机层的质量，表土的pH值以及碳和氮含量。我们预计梨形螨的密度会随着树木多样性的增加而增加，但我们希望树种身份的影响能够覆盖树木多样性的影响。此外，我们假设山毛榉的存在会降低oribatid螨的密度，但由于石灰和灰烬的存在会增加。正如预期的那样，树木多样性几乎没有影响到螨虫的群落，而树种的身份强烈改变了螨虫的密度和群落结构。然而，与我们的预期相反，山毛榉存在时，螨虫螨的密度最高，表明许多螨虫种类受益于顽固的垫料形成的厚有机层。尤其是鸦片类杆菌得益于山毛榉的存在，这可能是由于增加了诸如真菌和线虫等食物资源的可获得性。石灰和灰烬的单特异性簇中的臭螨的密度较低，这表明臭螨不能从这些物种的高质量凋落物中受益。值得注意的是，灰烬和石灰的存在使大型而强烈硬化的鸟蝠螨类物种，如剑龙（Steganacarus magnus）和长毛象（Chamobates voigtsi）受益。据推测，这些大物种能够更好地抵抗浅有机层中恶劣的微气候条件。

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