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Decadal manure substitution reshapes microbial communities to drive plant and microbial carbon accumulation in soil carbon fractions

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Titel: Decadal manure substitution reshapes microbial communities to drive plant and microbial carbon accumulation in soil carbon fractions
Autoren: Zhengwu Wu, Yanyan Zhang, Yuchuan Fan, Changquan Wang, Bing Li, Zed Rengel, Jianbo Shen, Edith le Cadre, Joann Whalen, Xiaoyan Tang
Quelle: Geoderma, Vol 463, Iss , Pp 117581- (2025)
Verlagsinformationen: Elsevier, 2025.
Publikationsjahr: 2025
Bestand: LCC:Science
Schlagwörter: Flooded soil, Composted pig manure, Microbial community dynamics, Organic residue, Particulate organic carbon, Mineral-associated organic carbon, Science
Beschreibung: The transformation of organic residues into particulate organic carbon (POC) and mineral-associated organic carbon (MAOC) governs soil organic carbon (SOC) storage and stability. However, how long-term manure use steers plant- and microbe-derived SOC fractions in paddy soils remains unclear. The SOC in paddy soil was evaluated by measuring amino sugars, lignin and enzyme activities from a 12-yr field trial (rice–wheat rotation) with no fertilizer, 100% mineral N fertilizer, and pig manure (50% and 100% replacement of N fertilizer). Compared to mineral N, the 100% pig manure treatment increased SOC by 26%, mainly through enhanced lignin input and microbial necromass accumulation, leading to significantly higher POC and MAOC levels. Manure application, compared to mineral N, promoted rice growth, which increased total organic C input and nutrient availability, thereby selectively favoring r-strategist bacteria, as reflected by a lower vanillyl acid-to-aldehyde ratio, a higher ratio of cellulose- to lignin-degrading enzyme activity, and greater lignin and bacterial necromass production. In contrast, the combined NPK and pig manure treatment increased the proportion of MAOC in total SOC by 7% compared to the 100% manure treatment, yet this came with enhanced lignin degradation, a lower bacterial phospholipid fatty acid (PLFA)/fungal PLFA ratio, and greater abundance of K-strategist fungi, resulting in less POC accumulation. These findings demonstrate that substituting mineral N with pig manure reshapes microbial community, enhancing the microbial transformation of plant- and microbe-derived residue into stable and labile SOC pools, and more effectively promotes SOC sequestration and persistence than mineral fertilization alone in paddy systems.
Publikationsart: article
Dateibeschreibung: electronic resource
Sprache: English
ISSN: 1872-6259
Relation: http://www.sciencedirect.com/science/article/pii/S0016706125004227; https://doaj.org/toc/1872-6259
DOI: 10.1016/j.geoderma.2025.117581
Zugangs-URL: https://doaj.org/article/cb4162fba8bf4ef89965d0c46d9ae985
Dokumentencode: edsdoj.b4162fba8bf4ef89965d0c46d9ae985
Datenbank: Directory of Open Access Journals
Beschreibung
Abstract:The transformation of organic residues into particulate organic carbon (POC) and mineral-associated organic carbon (MAOC) governs soil organic carbon (SOC) storage and stability. However, how long-term manure use steers plant- and microbe-derived SOC fractions in paddy soils remains unclear. The SOC in paddy soil was evaluated by measuring amino sugars, lignin and enzyme activities from a 12-yr field trial (rice–wheat rotation) with no fertilizer, 100% mineral N fertilizer, and pig manure (50% and 100% replacement of N fertilizer). Compared to mineral N, the 100% pig manure treatment increased SOC by 26%, mainly through enhanced lignin input and microbial necromass accumulation, leading to significantly higher POC and MAOC levels. Manure application, compared to mineral N, promoted rice growth, which increased total organic C input and nutrient availability, thereby selectively favoring r-strategist bacteria, as reflected by a lower vanillyl acid-to-aldehyde ratio, a higher ratio of cellulose- to lignin-degrading enzyme activity, and greater lignin and bacterial necromass production. In contrast, the combined NPK and pig manure treatment increased the proportion of MAOC in total SOC by 7% compared to the 100% manure treatment, yet this came with enhanced lignin degradation, a lower bacterial phospholipid fatty acid (PLFA)/fungal PLFA ratio, and greater abundance of K-strategist fungi, resulting in less POC accumulation. These findings demonstrate that substituting mineral N with pig manure reshapes microbial community, enhancing the microbial transformation of plant- and microbe-derived residue into stable and labile SOC pools, and more effectively promotes SOC sequestration and persistence than mineral fertilization alone in paddy systems.
ISSN:18726259
DOI:10.1016/j.geoderma.2025.117581