Fu Haoran, Chen Hong, Ma Zhengbo, Liang Guopeng, Tian Jing, Wanek Wolfgang, Chadwick David R, Jones Davey L, Wu Lianghuan, Ma Qingxu
Ministry of Education Key Lab of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, China.
State Key Laboratory of Soil Pollution Control and Safety; Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, China.
Glob Chang Biol. 2025 Jun;31(6):e70276. doi: 10.1111/gcb.70276.
The microbial entombing effect refers to the accumulation and stabilisation of microbially derived carbon (C) in soils following the sustained production of microbial biomass and necromass. Fertilisation practices modify soil microbial activity and C cycling and consequently influence the microbial entombing effect, which has implications for global C sequestration. We conducted a global meta-analysis to evaluate the impact of fertilisation practices on the microbial entombing effect, focusing on microbial necromass C (MNC), microbial biomass C (MBC) and the microbial necromass accumulation coefficient (NAC = MNC/MBC) across 319, 1665 and 199 paired datasets, respectively. Overall, fertilisation increased MNC by 16.6%, primarily because of an overall increase in MBC (31.9%) rather than an increase in NAC. Inorganic fertiliser application resulted in a higher accumulation of MNC (14.7%) and MBC (24.9%) in croplands than in forests and grasslands. Combining nitrogen (N) and phosphorus (P) fertilisers with straw (NPS) exhibited the highest potential for global MNC accumulation (14,900 Tg), exceeding the global average by 10.6% under fertilisation. Combining N and P fertilisers with manure (NPM) resulted in the highest global MBC (660 Tg) and NAC (35.3). These findings highlight the necessity of combined organic-inorganic fertilisation strategies to enhance soil C sequestration by increasing the contribution of the microbial entombing effect. While mean annual temperature (MAT) played a key role in determining MBC, the initial pH (ipH) and initial soil organic C (iSOC) were the dominant factors influencing the microbial entombing effect. In alkaline soils, particularly those in Central and Western Asia, NPS and NPM fertilisation exhibited the greatest potential for enhancing MNC and NAC, respectively. This study provides mechanistic insights into the impacts of fertilisation on the microbial entombing effect and highlights the critical need for site-specific management to optimise soil C sequestration.
微生物封存效应是指在微生物生物量和坏死物质持续产生后，土壤中微生物源碳（C）的积累和稳定。施肥措施会改变土壤微生物活性和碳循环，进而影响微生物封存效应，这对全球碳固存具有重要意义。我们进行了一项全球荟萃分析，以评估施肥措施对微生物封存效应的影响，重点关注微生物坏死物质碳（MNC）、微生物生物量碳（MBC）和微生物坏死物质积累系数（NAC = MNC/MBC），分别涉及319、1665和199对数据集。总体而言，施肥使MNC增加了16.6%，主要原因是MBC总体增加（31.9%）而非NAC增加。在农田中，施用无机肥料导致的MNC（14.7%）和MBC（24.9%）积累高于森林和草原。将氮（N）和磷（P）肥料与秸秆结合（NPS）表现出全球MNC积累的最高潜力（14900 Tg），在施肥情况下比全球平均水平高出10.6%。将N和P肥料与粪肥结合（NPM）导致全球最高的MBC（66 Tg）和NAC（35.3）。这些发现凸显了有机 - 无机联合施肥策略对于通过增加微生物封存效应的贡献来增强土壤碳固存必要性。虽然年均温度（MAT）在决定MBC方面起关键作用，但初始pH（ipH）和初始土壤有机碳（iSOC）是影响微生物封存效应的主要因素。在碱性土壤中，特别是中亚和西亚的土壤，NPS和NPM施肥分别表现出增强MNC和NAC的最大潜力。本研究为施肥对微生物封存效应的影响提供了机理见解，并强调了针对特定地点进行管理以优化土壤碳固存的迫切需求。
