Enhanced CO2 emissions from soil organic matter in agricultural fields during microbial community assemblage

IF 5.1 1区 农林科学 Q1 SOIL SCIENCE Biology and Fertility of Soils Pub Date : 2024-10-09 DOI:10.1007/s00374-024-01868-z
Guozhen Gao, Haiyan Cui, Pengfa Li, Shiyu Ma, Ming Liu, Meng Wu, Zhongpei Li
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Abstract

Using two kinds of microbial inoculations extracted from soil cropped to rice and peanut, we conducted a swap-inoculation experiment to explore the relative importance of microbial inoculation and soil properties on CO2 emissions from soil. Inoculated microorganisms into a soil different from their origin (swap inoculation) were partially successful and reduced CO2 emissions, namely according to home-field advantage (HFA); The success of invasive microorganisms depended on molecular composition of soil organic matter (SOM) compared to inoculation of native microbes (inoculated microorganisms into origin soil). The different habits screened the fewer microorganisms to undergo respiration for energy and life-sustaining activities, thus decreasing CO2 emissions from SOM. However, the effect of HFA diminished with incubation time, as the invasive microorganisms reshaped SOM molecular diversity and composition during microbial community assemblage, which fits with the Gaia effect (GE). Specific microbial communities, such as Bacteroidetes and Actinobacteria, drove the conversion of persistent molecules to labile molecules, thereby increasing the chances of SOM mineralization by microorganisms. We found there was positive correlation between labile SOM molecules and SOM mineralization. In addition, MBC increased in swap inoculation compared to native inoculation after 60 days, which also resulted in higher CO2 emissions from SOM. HFA and GE provide new perspectives to help decipher the interaction between microorganisms and the habitat under microbial invasion, and the mechanism of influence on CO2 emissions from SOM.

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微生物群落组合期间农田土壤有机物二氧化碳排放增加
利用从种植水稻和花生的土壤中提取的两种微生物接种,我们进行了交换接种实验,以探索微生物接种和土壤特性对土壤二氧化碳排放的相对重要性。将微生物接种到与其原产地不同的土壤中(交换接种)获得了部分成功,并减少了二氧化碳排放量,即根据主场优势(HFA);与接种本地微生物(将微生物接种到原产地土壤中)相比,入侵微生物的成功取决于土壤有机质(SOM)的分子组成。不同的生活习性筛选出较少的微生物进行呼吸作用以获取能量和维持生命活动,从而减少了 SOM 的二氧化碳排放量。然而,随着培养时间的延长,HFA 的效果逐渐减弱,因为在微生物群落组合过程中,入侵微生物重塑了 SOM 的分子多样性和组成,这与盖亚效应(GE)相吻合。特定的微生物群落(如类杆菌和放线菌)推动了持久性分子向易变性分子的转化,从而增加了微生物将SOM矿化的机会。我们发现,易变 SOM 分子与 SOM 矿化之间存在正相关。此外,与原生接种相比,交换接种的 MBC 在 60 天后有所增加,这也导致 SOM 的二氧化碳排放量增加。HFA和GE提供了新的视角,有助于解读微生物入侵下微生物与栖息地之间的相互作用,以及对SOM二氧化碳排放的影响机制。
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来源期刊
Biology and Fertility of Soils
Biology and Fertility of Soils 农林科学-土壤科学
CiteScore
11.80
自引率
10.80%
发文量
62
审稿时长
2.2 months
期刊介绍: Biology and Fertility of Soils publishes in English original papers, reviews and short communications on all fundamental and applied aspects of biology – microflora and microfauna - and fertility of soils. It offers a forum for research aimed at broadening the understanding of biological functions, processes and interactions in soils, particularly concerning the increasing demands of agriculture, deforestation and industrialization. The journal includes articles on techniques and methods that evaluate processes, biogeochemical interactions and ecological stresses, and sometimes presents special issues on relevant topics.
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