Soil warming and nitrogen addition facilitates lignin and microbial residues accrual in temperate agroecosystems

Ma, Lixiao; Ju, Zhang; Fang, Yunying; Vancov, Tony; Gao, Qiqi; Wu, Di; Zhang, Aiping; Wang, Yanan; Hu, Chunsheng; Wu, Wenliang; Du, Zhangliu

doi:10.1016/j.soilbio.2022.108693

Cited by 24 publications

(9 citation statements)

References 57 publications

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“…Microbial necromass decreased sharply where aridity indexes were greater than 0.77 and soil C‐to‐N ratios were above 9.6 (Hao et al, 2021). A significant increase in the amounts of microbial necromass was observed when the temperature was raised approximately 1.3–2.2°C in a 9‐year field trial (Ma et al, 2022). Using the combined outcomes of these experiments under various cropland management, edaphic and climatic conditions could help to identify the optimal scenarios for microbial necromass accumulation, and thereby encourage stable SOC formation and C sequestration.…”

Section: Introductionmentioning

confidence: 99%

Microbial necromass in cropland soils: A global meta‐analysis of management effects

Zhou

Liu

Dungait

et al. 2023

Global Change Biology

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Microbial necromass is a large and persistent component of soil organic carbon (SOC), especially under croplands. The effects of cropland management on microbial necromass accumulation and its contribution to SOC have been measured in individual studies but have not yet been summarized on the global scale. We conducted a metaanalysis of 481-paired measurements from cropland soils to examine the management effects on microbial necromass and identify the optimal conditions for its accumulation. Nitrogen fertilization increased total microbial necromass C by 12%, cover crops by 14%, no or reduced tillage (NT/RT) by 20%, manure by 21%, and straw amendment by 21%. Microbial necromass accumulation was independent of biochar addition. NT/ RT and straw amendment increased fungal necromass and its contribution to SOC more than bacterial necromass. Manure increased bacterial necromass higher than fungal, leading to decreased ratio of fungal-to-bacterial necromass. Greater microbial necromass increases after straw amendments were common under semi-arid and in cool climates in soils with pH <8, and were proportional to the amount of straw input.In contrast, NT/RT increased microbial necromass mainly under warm and humid climates. Manure application increased microbial necromass irrespective of soil properties and climate. Management effects were especially strong when applied during medium (3-10 years) to long (10+ years) periods to soils with larger initial SOC contents, but were absent in sandy soils. Close positive links between microbial biomass, necromass and SOC indicate the important role of stabilized microbial products for C accrual. Microbial necromass contribution to SOC increment (accumulation efficiency) under NT/RT, cover crops, manure and straw amendment ranged from 45% to 52%, which was 9%-16% larger than under N fertilization. In summary, long-term cropland management increases SOC by enhancing microbial necromass accumulation, and optimizing microbial necromass accumulation and its contribution to SOC sequestration requires site-specific management.

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Section: Introductionmentioning

confidence: 99%

Microbial necromass in cropland soils: A global meta‐analysis of management effects

Zhou

Liu

Dungait

et al. 2023

Global Change Biology

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“…Especially when after straw incorporation, the decomposition of lignocellulose was more efficient in surface soils than in deep soil ( Zhang et al, 2019 ). It means the initiation of lignin turnover is more sensitive in surface soils than in deeper soils ( Ma et al, 2022 ). These results demonstrate that the shallow soil will be more effective at degrading lignocellulose than the deep soil without adding exogenous composite microbial systems.…”

Section: Discussionmentioning

confidence: 99%

The effects of adding exogenous lignocellulose degrading bacteria during straw incorporation in cold regions on degradation characteristics and soil indigenous bacteria communities

et al. 2023

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Low temperature is one of the bottleneck factors that limits the degradation of straw during rice straw incorporation. Determining strategies to promote the efficient degradation of straw in cold regions has become a highly active research area. This study was to investigate the effect of rice straw incorporation by adding exogenous lignocellulose decomposition microbial consortiums at different soil depths in cold regions. The results showed that the lignocellulose was degraded the most efficiently during straw incorporation, which was in deep soil with the full addition of a high-temperature bacterial system. The composite bacterial systems changed the indigenous soil microbial community structure and diminished the effect of straw incorporation on soil pH, it also significantly increased rice yield and effectively enhanced the functional abundance of soil microorganisms. The predominant bacteria SJA-15, Gemmatimonadaceae, and Bradyrhizobium promoted straw degradation. The concentration of bacterial system and the depth of soil had significantly positive correlations on lignocellulose degradation. These results provide new insights and a theoretical basis for the changes in the soil microbial community and the application of lignocellulose-degrading composite microbial systems with straw incorporation in cold regions.

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“…In addition, N fertilization was shown to increase crop yields (Pan et al, 2019) and lignin (Ma, Ju, et al, 2022), this may probably dilute the contribution of microbial necromass to SOC in the Cambisol.…”

Section: Microbial Life-history Strategies Drive Mcp Efficacy and Car...mentioning

confidence: 99%

Microbial life‐history strategies mediate microbial carbon pump efficacy in response to N management depending on stoichiometry of microbial demand

Yang,

Canarini,

Zhang

et al. 2024

Global Change Biology

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The soil microbial carbon pump (MCP) is increasingly acknowledged as being directly linked to soil organic carbon (SOC) accumulation and stability. Given the close coupling of carbon (C) and nitrogen (N) cycles and the constraints imposed by their stoichiometry on microbial growth, N addition might affect microbial growth strategies with potential consequences for necromass formation and carbon stability. However, this topic remains largely unexplored. Based on two multi‐level N fertilizer experiments over 10 years in two soils with contrasting soil fertility located in the North (Cambisol, carbon‐poor) and Southwest (Luvisol, carbon‐rich), we hypothesized that different resource demands of microorganism elicit a trade‐off in microbial growth potential (Y‐strategy) and resource‐acquisition (A‐strategy) in response to N addition, and consequently on necromass formation and soil carbon stability. We combined measurements of necromass metrics (MCP efficacy) and soil carbon stability (chemical composition and mineral associated organic carbon) with potential changes in microbial life history strategies (assessed via soil metagenomes and enzymatic activity analyses). The contribution of microbial necromass to SOC decreased with N addition in the Cambisol, but increased in the Luvisol. Soil microbial life strategies displayed two distinct responses in two soils after N amendment: shift toward A‐strategy (Cambisol) or Y‐strategy (Luvisol). These divergent responses are owing to the stoichiometric imbalance between microbial demands and resource availability for C and N, which presented very distinct patterns in the two soils. The partial correlation analysis further confirmed that high N addition aggravated stoichiometric carbon demand, shifting the microbial community strategy toward resource‐acquisition which reduced carbon stability in Cambisol. In contrast, the microbial Y‐strategy had the positive direct effect on MCP efficacy in Luvisol, which greatly enhanced carbon stability. Such findings provide mechanistic insights into the stoichiometric regulation of MCP efficacy, and how this is mediated by site‐specific trade‐offs in microbial life strategies, which contribute to improving our comprehension of soil microbial C sequestration and potential optimization of agricultural N management.

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Soil warming and nitrogen addition facilitates lignin and microbial residues accrual in temperate agroecosystems

Cited by 24 publications

References 57 publications

Microbial necromass in cropland soils: A global meta‐analysis of management effects

Microbial necromass in cropland soils: A global meta‐analysis of management effects

The effects of adding exogenous lignocellulose degrading bacteria during straw incorporation in cold regions on degradation characteristics and soil indigenous bacteria communities

Microbial life‐history strategies mediate microbial carbon pump efficacy in response to N management depending on stoichiometry of microbial demand

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