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首页> 外文期刊>Applied Soil Ecology >Microbial community size is a potential predictor of nematode functional group in limed grasslands
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Microbial community size is a potential predictor of nematode functional group in limed grasslands

机译：微生物群落规模是跛行草原中线虫功能组的潜在预测因子

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摘要

Agronomic management practices can impose structural change within soil biotic communities that may negatively impact soil processes including function and biodiversity. Thus, optimizing sustainable crop production that confers minimal impacts on the structure and function of soil biota is an imperative to deliver healthy, functional and resilient production systems. Liming is a management intervention to mitigate soil acidification with a generally positive effect on crop biomass. The application of lime changes soil pH, a known driver of microbial community composition, but it is unknown whether pH derived shifts in bacterial communities result in altered nematode communities. In this study we used qPCR, next generation sequencing and nematode directed T-RFLP to characterise microbial and nematode communities in a liming field trial with a control and three liming applications to incrementally increase pH by 0.5, 0.75 and 1 pH unit. We demonstrate over a 14-month experimental period an interaction between microbial and nematode communities in managed grasslands. Liming had a limited effect on nematode and microbial community structures. However bacterial and archaeal abundance as measured by 16S rRNA gene copy number was found to be a potential predictor of nematode functional group, based on recognized trophic strategies, with increased abundance of omnivorous and predatory nematodes, that are known to prey upon bacterivorous nematodes, with a concomitant increase of 16S rRNA gene copy number. Thus, indirectly suggesting suppression of the bacterial and archaeal community in the presence of bacterivorous nematodes. Where populations of bacterivorous nematodes were highest the relative abundance of both predatory and omnivorous nematodes was lowest. Thus, this study demonstrates clear connectivity between soil microbial and nematode communities in grassland soil.
机译：农艺管理措施可以对土壤生物社区中的结构变化施加产生负面影响，包括函数和生物多样性。因此，优化可持续的作物生产，以赋予土壤生物群结构和功能的最小影响是提供健康，功能和弹性生产系统的必要性。雷明是一种治疗土壤酸化的管理干预，以造成的作物生物量大致积极作用。石灰的应用改变了土壤pH，一种已知的微生物群落组成的驱动器，但是未知细菌社区中的pH衍生偏移是否导致线虫社区改变。在该研究中，我们使用了QPCR，下一代测序和线虫指向T-RFLP，以在利用对照和三个跛行应用中表征微生物和线虫社区，以逐步增加pH值0.5,0.75和1 pH单位。我们在一个14个月的实验期上展示了管理草原上微生物和线虫社区之间的相互作用。 Limining对线虫和微生物群落结构的影响有限。然而，通过16S rRNA基因拷贝数测量的细菌和古物丰富是基于公认的营养策略的Nematode官能团的潜在预测因子，随着杂种和捕食性线虫的增加，捕食性导航剂的额外数量增加，可与伴随增加16s rRNA基因拷贝数。因此，间接地表明在诱导的细菌线虫存在下抑制细菌和古群落。其中诱导抑菌线虫的种群最高，捕食性和杂种线虫的相对丰度最低。因此，该研究表明了草原土壤微生物和线虫社区之间的明显连通性。

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