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首页> 外文期刊>Soil Biology & Biochemistry >Plot-scale manipulations of organic matter inputs to soils correlate with shifts in microbial community composition in a lowland tropical rain forest
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Plot-scale manipulations of organic matter inputs to soils correlate with shifts in microbial community composition in a lowland tropical rain forest

机译：在低地热带雨林中，对土壤中有机物输入的规模控制与微生物群落组成的变化有关

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Little is known about the organisms responsible for decomposition in terrestrial ecosystems, or how variations in their relative abundance may influence soil carbon (C) cycling. Here, we altered organic matter in situ by manipulating both litter and throughfall inputs to tropical rain forest soils, and then used qPCR and error-corrected bar-coded pyrosequencing to investigate how the resulting changes in soil chemical properties affected microbial community structure. The plot-scale manipulations drove significant changes in microbial community composition: Acidobacteria were present in greater relative abundance in litter removal plots than in double-litter plots, while Alphaproteobacteria were found in higher relative abundance in double-litter and throughfall reduction plots than in control or litter removal plots. In addition, the bacterial:archaeal ratio was higher in double-litter than no-litter plots. The relative abundances of Actinobacteria, Alphaproteobacteria and Gammaproteobacteria were positively correlated with microbial biomass C and nitrogen (N), and soil N and C pools, while acidobacterial relative abundance was negatively correlated with these same factors. Bacterial:archaeal ratios were positively correlated with soil moisture, total soil C and N, extractable ammonium pools, and soil C:N ratios. Additionally, bacterial:archaeal ratios were positively related to the relative abundance of Actinobacteria, Gammaproteobacteria, and Actinobacteria, and negatively correlated to the relative abundance of Nitrospira and Acidobacteria. Together, our results support the copiotrophic/oligotrophic model of soil heterotrophic microbes suggested by Fierer et al. (2007)
机译：人们对负责陆地生态系统分解的生物及其相对丰度的变化如何影响土壤碳（C）循环知之甚少。在这里，我们通过操纵热带雨林土壤的凋落物和穿透物输入来原位改变有机质，然后使用qPCR和错误校正的条形码焦磷酸测序来研究土壤化学性质的变化如何影响微生物群落结构。地块规模的操作推动了微生物群落组成的显着变化：凋落物清除地中的酸性细菌比双垃圾地中的相对丰度更高，而双垃圾地和穿透减少量地中的酸菌比相对高。或垃圾清除地块。此外，双垫料区的细菌：古细菌比例高于无垫料区。放线菌，α-变形杆菌和γ-变形杆菌的相对丰度与微生物生物量碳和氮（N）以及土壤氮和碳库呈正相关，而酸性细菌的相对丰度与这些相同因素呈负相关。细菌：古细菌的比例与土壤水分，土壤总碳和氮，可提取的氨水和土壤碳：氮的比例呈正相关。此外，细菌：古细菌的比例与放线菌，γ-变形杆菌和放线菌的相对丰度呈正相关，与硝化螺旋藻和嗜酸菌的相对丰度呈负相关。总之，我们的研究结果支持了Fierer等人提出的土壤异养微生物的营养型/营养型模型。 （2007年）

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