Unlocking Mechanisms for Soil Organic Matter Accumulation: Carbon Use Efficiency and Microbial Necromass as the Keys

Global Change Biology, Journal Year: 2025, Volume and Issue: 31(1)

Published: Jan. 1, 2025

Soil microorganisms transform plant-derived C (carbon) into particulate organic (POC) and mineral-associated (MAOC) pools. While microbial carbon use efficiency (CUE) is widely recognized in current biogeochemical models as a key predictor of soil (SOC) storage, large-scale empirical evidence limited. In this study, we proposed experimentally tested two predictors POC MAOC pool formation: necromass (using amino sugars proxy) CUE (by 18O-H2O approach). sampling (0-10 10-20 cm depth) was conducted along climatic transect 900 km on the Loess Plateau, including cropland, grassland, shrubland, forest ecosystems, to ensure homogeneous parent material. We found highest accumulation occurred zones MAT between 5°C 10°C or MAP 300 500 mm. Microbial more positively related than (p < 0.05), suggesting that residues may improve strongly compared pool. Random linear regression analyses showed increased with fungal C, whereas bacterial drove MAOC. coupled 0.05) but decoupled SOC > 0.05). The have faster turnover rate due lack clay protection, which lead rapid thus their decoupling from CUE. sense, driven by necromass, explains dynamics. Our findings highlight insufficiency relying solely predict bulk storage. Instead, propose should be used together explain dynamics, each influencing distinct

Language: Английский

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Microbial Metabolic Limitation in Response to Phosphorus Enrichment: Implications for Carbon Sequestration in a Nitrogen‐Enriched Desert Steppe

Land Degradation and Development, Journal Year: 2025, Volume and Issue: unknown

Published: March 11, 2025

ABSTRACT The availability of nitrogen (N) and phosphorus (P) significantly influences microbial metabolism, thereby affecting soil carbon (C) sequestration. However, it remains unclear how resource limitation C turnover dynamics respond to P under elevated N loads in dryland ecosystems. To address this, we conducted a 7‐year experiment desert steppe northern China, applying gradient additions (0–16 g m −2 year −1 ) conditions loading (atmospheric deposition +5 ). Our aim was investigate nutrient limitations their impact on use efficiency (CUE) based stoichiometry theory. findings revealed that, loading, metabolism both the surface (0–10 cm) subsurface (10–20 layers topsoil limited by P. Interestingly, with increasing addition, initially increased then decreased at but remained unchanged subsurface. Under limitation, enrichment did not alleviate either layer. Surprisingly, communities maintained plastic stoichiometric homeostasis despite aggravated C:P N:P imbalances. Furthermore, CUE layers, experiencing most significant decline. Further analysis showed that factors driving varied between enrichment, enhanced strongly inhibiting CUE. study indicates due can reduce exacerbate This could potentially lead greater loss N‐enriched soils.

Language: Английский

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Soil carbon pool dynamics, microbial community diversity and pineapple (Ananas comosus) productivity response to partial organic substitution strategies: A four-year study

Scientia Horticulturae, Journal Year: 2025, Volume and Issue: 343, P. 114096 - 114096

Published: March 1, 2025

Language: Английский

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Will Climate Endowment Affect the Improvement of Agricultural Production Efficiency? Evidence From Cities in Zhejiang Province, China

Land Degradation and Development, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 18, 2024

ABSTRACT Climate change poses constraints on nature‐based agricultural productivity, necessitating an understanding of urban agriculture's performance across varying climatic conditions. This study examines the impacts temperature, precipitation, and evapotranspiration production potential efficiency using a pooled OLS model. The results show that there is spatial pattern alternating high low units, in areas where values hover around 0.5, still exists significant for improvement. Through regression analysis, precipitation has significantly positive impact improving efficiency. However, effects temperature potential, insolation are either not or exhibit poor stability. heterogeneity test effect enhancing varies between cities northeastern southwestern Zhejiang, with only few experiencing benefits. Furthermore, innovation this resides its comprehensive application management science, climatology, geography, other interdisciplinary approaches to deeply explore influences different resource endowments from perspective. research approach provides fresh insights into how agriculture can be optimized under complex ever‐changing

Language: Английский

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