Root exudate chemistry affects soil carbon mobilization via microbial community reassembly

Wen, Teng; Yu, Guanghui; Hong, Wen-Dan; Yuan, Jun; Niu, Guoqing; Xie, Penghao; Sun, Fangyuan; Guo, Laodong; Kuzyakov, Yakov; Shen, Qirong

doi:10.1016/j.fmre.2021.12.016

Cited by 70 publications

(24 citation statements)

References 57 publications

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“…The post-harvest soils of SRI-AWD technique had higher plant biomass that might result in secretion of root exudates and metabolites that improved water-soluble carbon ( Thakur et al., 2011 ; Mandal et al., 2020 ; Wen et al., 2022 ). Generally, soil moisture regime of 60%–80% field capacity is best suitable for microbial activity ( Linn and Doran, 1984 ; Zhang et al., 2020 ).…”

Section: Discussionmentioning

confidence: 99%

Multi-criteria assessment to screen climate smart rice establishment techniques in coastal rice production system of India

et al. 2023

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IntroductionConventional rice production techniques are less economical and more vulnerable to sustainable utilization of farm resources as well as significantly contributed GHGs to atmosphere.MethodsIn order to assess the best rice production system for coastal areas, six rice production techniques were evaluated, including SRI-AWD (system of rice intensification with alternate wetting and drying (AWD)), DSR-CF (direct seeded rice with continuous flooding (CF)), DSR-AWD (direct seeded rice with AWD), TPR-CF (transplanted rice with CF), TPR-AWD (transplanted rice with AWD), and FPR-CF (farmer practice with CF). The performance of these technologies was assessed using indicators such as rice productivity, energy balance, GWP (global warming potential), soil health indicators, and profitability. Finally, using these indicators, a climate smartness index (CSI) was calculated.Results and discussionRice grown with SRI-AWD method had 54.8 % higher CSI over FPR-CF, and also give 24.5 to 28.3% higher CSI for DSR and TPR as well. There evaluations based on the climate smartness index can provide cleaner and more sustainable rice production and can be used as guiding principle for policy makers.

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Section: Discussionmentioning

confidence: 99%

Multi-criteria assessment to screen climate smart rice establishment techniques in coastal rice production system of India

et al. 2023

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“…Spearman correlation was conducted to evaluate the relationship of the protist community with individual bacterial and fungal taxa at the class level. To explore the direct and indirect relationships among fertilization, edaphic, biotic factors and the composition of protistan functional groups (based on the first axis of PCoA), directed graphs of the partial least squares path model (PLS-PM) analysis were conducted with the package ‘plspm’ ( Wen et al, 2022 ). Notably, this is an exploratory data analysis technique that may be applied to any kind of dataset and has little limitation regarding data independence and normality.…”

Section: Methodsmentioning

confidence: 99%

Fertilization drives distinct biotic and abiotic factors in regulating functional groups of protists in a 5-year fertilization system

Zhang

et al. 2022

Front. Microbiol.

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IntroductionProtists play an important role in nutrient cycling, microbiome stability and soil fertility maintenance. However, the driving force of protistan functional groups remains poorly understood in agricultural ecosystems.MethodsWe investigated the impacts of fertilization regimes on the diversity, composition and functional groups of protists and further disentangled the effects of multiple factors shaping the community composition of functional groups in a 5-year fertilization regime (CK, no fertilization; M, organic fertilization; MNPK, combined inorganic and organic fertilization; NPK, inorganic fertilization).ResultsFertilization significantly changed the community composition of protists rather than diversity. The MNPK treatment significantly increased the relative abundance of phototrophs and decreased that of the parasites and consumers. Partial least squares path modeling indicated that fertilization indirectly regulated protistan consumers via changes in the P content, which affected the composition of consumers mainly by regulating fungal community composition. Soil moisture (SM) and available phosphorus (AP) were identified as the top predictors for the composition of parasites, and the composition of phototrophs was mainly affected by SM, indicating that parasites and phototrophs were more sensitive to abiotic factors in the fertilization system.DiscussionTaken together, our findings highlight that fertilization significantly affects the composition of functional groups of protists and their biotic or abiotic regulatory processes, which have implications for the potential changes in their ecosystem functions for soil management systems.

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“…This is because when organic matter is combined with minerals, the contact between soil microbes and enzymes can be effectively reduced, which then reduces the probability of organic matter being degraded [ 71 ]. Since different components in root exudates have different energy content, C oxidation status, and structural complexity, they have different effects on the carbon use efficiency (CUE) of soil microbes [ 72 ]. Microbial functional groups with different physiology and abundance have different contributions to the transformation of rhizodeposited carbon into SOC.…”

Section: Mechanism Of Root Exudates Affecting Soil Organic Carbon Seq...mentioning

confidence: 99%

Root Exudates Mediate the Processes of Soil Organic Carbon Input and Efflux

Shen

Zhao

et al. 2023

Plants

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Root exudates, as an important form of material input from plants to the soil, regulate the carbon input and efflux of plant rhizosphere soil and play an important role in maintaining the carbon and nutrient balance of the whole ecosystem. Root exudates are notoriously difficult to collect due to their underlying characteristics (e.g., low concentration and fast turnover rate) and the associated methodological challenges of accurately measuring root exudates in native soils. As a result, up until now, it has been difficult to accurately quantify the soil organic carbon input from root exudates to the soil in most studies. In recent years, the contribution and ecological effects of root exudates to soil organic carbon input and efflux have been paid more and more attention. However, the ecological mechanism of soil organic carbon input and efflux mediated by root exudates are rarely analyzed comprehensively. In this review, the main processes and influencing factors of soil organic carbon input and efflux mediated by root exudates are demonstrated. Soil minerals and soil microbes play key roles in the processes. The carbon allocation from plants to soil is influenced by the relationship between root exudates and root functional traits. Compared with the quantity of root exudates, the response of root exudate quality to environmental changes affects soil carbon function more. In the future, the contribution of root exudates in different plants to soil carbon turnover and their relationship with soil nutrient availability will be accurately quantified, which will be helpful to understand the mechanism of soil organic carbon sequestration.

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Root exudate chemistry affects soil carbon mobilization via microbial community reassembly

Cited by 70 publications

References 57 publications

Multi-criteria assessment to screen climate smart rice establishment techniques in coastal rice production system of India

Multi-criteria assessment to screen climate smart rice establishment techniques in coastal rice production system of India

Fertilization drives distinct biotic and abiotic factors in regulating functional groups of protists in a 5-year fertilization system

Root Exudates Mediate the Processes of Soil Organic Carbon Input and Efflux

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