Soil carbon sequestration by root exudates

Trends in Plant Science, Год журнала: 2022, Номер 27(8), С. 749 - 757

Опубликована: Май 20, 2022

Язык: Английский

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Mechanisms of soil organic carbon stability and its response to no‐till: A global synthesis and perspective

Global Change Biology, Год журнала: 2021, Номер 28(3), С. 693 - 710

Опубликована: Ноя. 2, 2021

Mechanisms of soil organic carbon (SOC) stabilization have been widely studied due to their relevance in the global cycle. No-till (NT) has frequently adopted sequester SOC; however, limited information is available regarding whether sequestered SOC will be stabilized for long term. Thus, we reviewed mechanisms affecting stability NT systems, including priming effects (PE), molecular structure SOC, aggregate protection, association with minerals, microbial properties, and environmental effects. Although a more steady-state observed compared conventional tillage (CT), may depend on physical chemical protection. On average, improves macro-aggregation by 32.7%, lowers mineralization macro-aggregates CT. Chemical protection also important direct adsorption molecules enhancement aggregation minerals. Higher activity could produce binding agents promote formation metal-oxidant complexes. residues soils over term through attachment mineral surfaces entrapment aggregates under NT. reduces 18.8% PE intensities after fresh inputs 21.0% CT (p < .05). higher temperature sensitivity (Q10 ) greater Q10 macro-aggregates, an increase moisture regime potentially constrain improvement . This review process-based understanding mechanism that can act, independently or interactively, enhance preservation. It concluded systems likely

Язык: Английский

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Soil carbon persistence governed by plant input and mineral protection at regional and global scales

Ecology Letters, Год журнала: 2021, Номер 24(5), С. 1018 - 1028

Опубликована: Март 11, 2021

Abstract Elucidating the processes underlying persistence of soil organic matter (SOM) is a prerequisite for projecting carbon feedback to climate change. However, potential role plant input in regulating multi‐layer SOM preservation over broad geographic scales remains unclear. Based on large‐scale radiocarbon (∆ 14 C) measurements Tibetan Plateau, we found that was major contributor topsoil destabilisation despite significant associations ∆ C with climatic and mineral variables as well chemical composition. By contrast, protection by iron–aluminium oxides cations became more important preserving deep soils. These regional observations were confirmed global synthesis derived from International Soil Radiocarbon Database (ISRaD). Our findings illustrate different effects across layers, providing new insights models better predict dynamics under changing environments.

Язык: Английский

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Advancing the mechanistic understanding of the priming effect on soil organic matter mineralisation

Functional Ecology, Год журнала: 2022, Номер 36(6), С. 1355 - 1377

Опубликована: Март 9, 2022

Abstract The priming effect (PE) is a key mechanism contributing to the carbon balance of soil ecosystem. Almost 100 years research since its discovery in 1926 have led rich body scientific publications identify drivers and mechanisms involved. A few review articles summarised acquired knowledge; last major one was published 2010. Since then, knowledge on microbial communities involved PE + C sequestration has been considerably renewed. This article reviews current state what extent new insights may improve our ability understand predict evolution stocks. We propose framework unify different concepts terms that emerged from international community this topic, report recent discoveries needs. Seventy per cent studies were 10 years, illustrating renewed interest for PE, probably linked increased concern about importance climate change food security issues. Among all proposed along with explain some are named differently but actually refer same object. overall introduces ‘artificial’ complexity mechanistic understanding we common, shared terminology. Despite remaining gaps, consistent progress achieved decipher abiotic underlying together role enzymes identity actors However, including into models SOM dynamics remains challenging as long not fully understood. In meantime, empirical alternatives available reproduce observations accurately when calibration robust. Based knowledge, scenarios depicting impact ecosystem services under conditions. Read free Plain Language Summary Journal blog.

Язык: Английский

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Contrasting effects of straw and straw-derived biochar applications on soil carbon accumulation and nitrogen use efficiency in double-rice cropping systems

Agriculture Ecosystems & Environment, Год журнала: 2021, Номер 311, С. 107286 - 107286

Опубликована: Янв. 30, 2021

Язык: Английский

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Microbial metabolism and necromass mediated fertilization effect on soil organic carbon after long-term community incubation in different climates

The ISME Journal, Год журнала: 2021, Номер 15(9), С. 2561 - 2573

Опубликована: Март 12, 2021

Язык: Английский

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Soil priming effect and its responses to nutrient addition along a tropical forest elevation gradient

Global Change Biology, Год журнала: 2021, Номер 27(12), С. 2793 - 2806

Опубликована: Март 8, 2021

Abstract Priming plays important roles in terrestrial carbon cycling, but the patterns and drivers of priming its responses to nutrient addition tropical forests remain unclear. By collecting soils along a forest elevation gradient, we conducted an incubation experiment with 13 C‐labeled glucose (N and/or P) additions. Results showed that effects increased soil organic matter decomposition by 44 ± 12% across elevations, intensity decreased significantly elevation. Among microbial properties, (SOC) content pH were two key factors negatively positively regulating priming, respectively. Across additions N, P, or both them (NP) did not change priming. However, variations on correlated initial availability. The for N availability, P NP Based these relationships, proposed conceptual framework linking stoichiometric mining hypotheses, which former dominates low‐nutrient availability latter high‐nutrient soils. This can help explain contrasting Collectively, our findings highlight SOC intensity, role

Язык: Английский

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Crop residue return sustains global soil ecological stoichiometry balance

Global Change Biology, Год журнала: 2023, Номер 29(8), С. 2203 - 2226

Опубликована: Янв. 6, 2023

Although soil ecological stoichiometry is constrained in natural ecosystems, its responses to anthropogenic perturbations are largely unknown. Inputs of inorganic fertilizer and crop residue key cropland managements, with potential alter their stoichiometry. We conducted a global synthesis 682 data pairs quantify the carbon (C), nitrogen (N), phosphorus (P) grain yields combined inputs plus compared only application. Crop enhance C (10.5%-12%), N (7.63%-9.2%), P (2.62%-5.13%) contents, an increase C:N (2.51%-3.42%) C:P (7.27%-8.00%) ratios, (6.12%-8.64%), indicating that alleviated limitation caused by alone was able sustain balanced Moreover, C:N(P) ratio reached saturation ~13-16 years after return, while yield trend discontinued. Furthermore, we identified increased C, N, contents ratios were regulated initial pH content, not related properties, but also negatively amount input greater extent. Given residual improvement varies properties levels, propose predictive model preliminary evaluate for improvement. Particularly, suggest part budget should be used subsidize management strategies, achieving win-win situation agricultural production, protection, climate change mitigation.

Язык: Английский

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Priming effect on soil carbon decomposition by root exudate surrogates: A meta-analysis

Soil Biology and Biochemistry, Год журнала: 2023, Номер 178, С. 108955 - 108955

Опубликована: Янв. 10, 2023

Язык: Английский

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Mineral weathering is linked to microbial priming in the critical zone

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Янв. 20, 2023

Abstract Decomposition of soil organic matter (SOM) can be stimulated by fresh input, a phenomenon known as the ‘priming effect’. Despite its global importance, relationship priming effect to mineral weathering and nutrient release remains unclear. Here we show close linkages between in critical zone primed decomposition SOM. Intensified rock-derived are generally coupled with SOM resulting from “triggered” microbial activity. Fluxes products decomposed via linearly correlated congruency. Weathering congruency influences formation organo-mineral associations, thereby modulating accessibility decomposers and, thus, effect. Our study links decomposition, which plays key role controlling C dynamics space time. These connections represent fundamental long-term lithogenic element cycling (= weathering) rapid turnover carbon nutrients priming) soil.

Язык: Английский

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