{"title":"The divergent response of fungal and bacterial necromass carbon in soil aggregates under biochar amendment in paddy soil","authors":"Mengtao Zhu, Zhiwei Liu, Qi Yi, Ruiling Ma, Man Xu, Kaiyue Song, Rongjun Bian, Jufeng Zheng, Xuhui Zhang","doi":"10.1007/s11104-025-07228-6","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Background and aims</h3><p>Microbial necromass carbon (C) significantly contributes to soil organic carbon (SOC) sequestration. However, there is limited information on how biochar amendment affects the accumulation and allocation of microbial necromass C in soil aggregates in paddy soil remains scarce, particularly with regard to changes in microbial life strategies.</p><h3 data-test=\"abstract-sub-heading\">Methods</h3><p>From a 2-year field experiment, topsoil samples with biochar (C15) and without biochar amendment (C0) treatments were collected and fractionated into macroaggregate (2000–250 μm), microaggregate (250–53 μm), and silt–clay (< 53 μm) fractions. We investigated the impact of maize straw-derived biochar amendment on microbial community structure, SOC, and microbial necromass C in paddy soil aggregates.</p><h3 data-test=\"abstract-sub-heading\">Results</h3><p>Biochar amendment significantly increased SOC and microbial biomass C but reduced microbial necromass C concentration. The microbial community shifted towards K-strategists under biochar amendment. Compared with the C0 treatment, total necromass C concentration in the C15 treatment decreased by 14.9% in the bulk soil, primarily due to reductions in fungal and bacterial necromass C concentrations of 14.7% and 16.1%, respectively. The decrease in total necromass C was primarily observed in macroaggregate and microaggregate. Specially, fungal necromass C primarily decreased in macroaggregate, while bacterial necromass C decreased in microaggregate. Biochar amendment did not significantly reduce microbial necromass C in silt–clay fraction, indicating its greater stabilization due to strong binding with soil minerals under biochar amendment, thereby protects it from microbial decomposition.</p><h3 data-test=\"abstract-sub-heading\">Conclusions</h3><p>The results offer new insights into the role of soil aggregates in microbial-mediated SOC sequestration following biochar amendment in paddy soil.</p>","PeriodicalId":20223,"journal":{"name":"Plant and Soil","volume":"61 1","pages":""},"PeriodicalIF":3.9000,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Plant and Soil","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.1007/s11104-025-07228-6","RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRONOMY","Score":null,"Total":0}
引用次数: 0
Abstract
Background and aims
Microbial necromass carbon (C) significantly contributes to soil organic carbon (SOC) sequestration. However, there is limited information on how biochar amendment affects the accumulation and allocation of microbial necromass C in soil aggregates in paddy soil remains scarce, particularly with regard to changes in microbial life strategies.
Methods
From a 2-year field experiment, topsoil samples with biochar (C15) and without biochar amendment (C0) treatments were collected and fractionated into macroaggregate (2000–250 μm), microaggregate (250–53 μm), and silt–clay (< 53 μm) fractions. We investigated the impact of maize straw-derived biochar amendment on microbial community structure, SOC, and microbial necromass C in paddy soil aggregates.
Results
Biochar amendment significantly increased SOC and microbial biomass C but reduced microbial necromass C concentration. The microbial community shifted towards K-strategists under biochar amendment. Compared with the C0 treatment, total necromass C concentration in the C15 treatment decreased by 14.9% in the bulk soil, primarily due to reductions in fungal and bacterial necromass C concentrations of 14.7% and 16.1%, respectively. The decrease in total necromass C was primarily observed in macroaggregate and microaggregate. Specially, fungal necromass C primarily decreased in macroaggregate, while bacterial necromass C decreased in microaggregate. Biochar amendment did not significantly reduce microbial necromass C in silt–clay fraction, indicating its greater stabilization due to strong binding with soil minerals under biochar amendment, thereby protects it from microbial decomposition.
Conclusions
The results offer new insights into the role of soil aggregates in microbial-mediated SOC sequestration following biochar amendment in paddy soil.
期刊介绍：
Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.
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