Wang Peng, Kuzyakov Yakov, Wang Yueying, Liu Ying, Liu Ji, Qi Zhiming, He Yong, Jiang Qianjing
Department of Biosystems Engineering, Zhejiang University, 310058, Hangzhou, China.
Department of Soil Science of Temperate Ecosystems, Department of Agricultural Soil Science, University of Goettingen, 37077, Göttingen, Germany; Peoples Friendship University of Russia (RUDN University), 117198, Moscow, Russia.
J Environ Manage. 2025 Jul;388:126008. doi: 10.1016/j.jenvman.2025.126008. Epub 2025 May 29.
Under the dual challenges of global climate change and agricultural sustainability, cropland soils, as critical carbon (C) sinks, have garnered significant attention regarding the stabilization mechanisms of their organic C pools. Existing studies indicate that the stable organic C pool in cropland soils primarily originates from the accumulation of microbial necromass, a process strongly influence by agricultural management practices. However, there remains a notable knowledge gap regarding how various management strategies influence microbially turnover and necromass formation mechanisms. This study integrates 1082 globally distributed paired experimental datasets to establish the quantitative framework linking microbial necromass dynamics with multi-scale management practices. The results showed that the greatest increase in microbial necromass C (MNC) content (42 %) was obtained when mineral and organic fertilizers were combined. Individually, the application of manure, straw, and green manure boosted MNC by 28 %, 9 %, and 31 %, respectively. Conservation tillage and crop rotation increased MNC by 20 % and 14 %, respectively. A pivotal advancement lies in elucidating the lagged formation of microbial necromass relative to living biomass turnover and demonstrating the superior coupling effects of integrated management strategies over singular practices. Interactions among climatic, soil physicochemical and microbial properties regulated the necromass formation pathways and organic C accumulation. Appropriate management strategies can boost C sequestration in cropland soils by facilitating microbial necromass accumulation, offering potential benefits at both regional and global scales.
在全球气候变化和农业可持续性的双重挑战下，农田土壤作为关键的碳汇，其有机碳库的稳定机制备受关注。现有研究表明，农田土壤中稳定的有机碳库主要源于微生物残体的积累，这一过程受农业管理措施的强烈影响。然而，关于各种管理策略如何影响微生物周转和残体形成机制，仍存在显著的知识空白。本研究整合了1082个全球分布的配对实验数据集，以建立将微生物残体动态与多尺度管理措施联系起来的定量框架。结果表明，矿物肥料和有机肥料结合使用时，微生物残体碳（MNC）含量增加最多（42%）。单独来看，施用粪肥、秸秆和绿肥分别使MNC提高了28%、9%和31%。保护性耕作和作物轮作分别使MNC增加了20%和14%。一个关键进展在于阐明微生物残体相对于活生物量周转的滞后形成，并证明综合管理策略比单一措施具有更好的耦合效应。气候、土壤理化性质和微生物特性之间的相互作用调节了残体形成途径和有机碳积累。适当的管理策略可以通过促进微生物残体积累来提高农田土壤的碳固存，在区域和全球尺度上都具有潜在益处。
