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Soil biochemical properties and bacteria community in a repeatedly fumigated-incubated soil
Biology and Fertility of Soils ( IF 6.5 ) Pub Date : 2020-02-05 , DOI: 10.1007/s00374-020-01437-0
Xiaoyu Zhou , Lin Chen , Jianming Xu , Philip C. Brookes

The regulatory gate hypothesis considers that soil organic C mineralization is a two-step process, where stable C is firstly transformed abiotically and is only then a microbially available substrate. The mechanisms involved in the abiotic conversion of non-microbially available to available soil organic C remain largely unknown. We conducted a perfusion experiment using a repeated fumigated-incubated soil and the corresponding fresh soil. We found that repeated fumigation-incubation significantly decreased soil microbial ATP to 0.22 nmol g −1 soil, 10% of that in the fresh soil, and significantly destroyed microbial composition and diversity. However, it had little influence on the soil CO 2 -C evolution rate after the flush of fumigant-killed dead biomass (8 μg CO 2 -C g −1 soil day −1 ) or dissolved organic C (DOC) concentration (about 7 μg C g −1 soil) and composition during long-term perfusion. We conclude that soil CO 2 evolution rate and DOC generation were not regulated by the size or composition of the soil microbial communities. This is in support of the regulatory gate hypothesis. We suggest that abiotic processes in soil organic C mineralization need to be considered more and studied further. Graphical abstract

中文翻译:

反复熏蒸培养土壤中的土壤生化特性和细菌群落

调控门假设认为土壤有机碳矿化是一个两步过程,其中稳定的碳首先被非生物转化,然后才是微生物可用的底物。非生物转化为可用土壤有机碳的非生物转化机制在很大程度上仍然未知。我们使用反复熏蒸培养的土壤和相应的新鲜土壤进行了灌注实验。我们发现反复熏蒸-孵化显着降低土壤微生物ATP至0.22 nmol g -1 土壤,是新鲜土壤的10%,并显着破坏微生物组成和多样性。然而,熏蒸灭活的死生物量(8 μg CO 2 -C g -1 土壤日 -1 )或溶解有机碳(DOC)浓度(约7 μg C)冲洗后,对土壤CO 2 -C 演化速率几乎没有影响。 g -1 土壤)和长期灌注期间的组成。我们得出结论,土壤 CO 2 演化速率和 DOC 生成不受土壤微生物群落大小或组成的调节。这支持了监管门假设。我们建议需要更多地考虑和进一步研究土壤有机碳矿化中的非生物过程。图形概要 我们建议需要更多地考虑和进一步研究土壤有机碳矿化中的非生物过程。图形概要 我们建议需要更多地考虑和进一步研究土壤有机碳矿化中的非生物过程。图形概要
更新日期:2020-02-05
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