Phosphorus fractions and their transformation in coupling with organic carbon cycling after seven-year manure application in subtropical soil
文献类型： 外文期刊
作者： Zhang, Jingjing 1 ; Huang, Jiaqing 2 ; Wen, Jiong 3 ; Peng, Zhi 3 ; Zhang, Nan 1 ; Wang, Yanan 1 ; Zhang, Yang 1 ; Su, Shiming 1 ; Zeng, Xibai 1 ;
作者机构： 1.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Key Lab Agroenvironm, Minist Agr China, Beijing 100081, Peoples R China
2.Fujian Acad Agr Sci, Inst Resources Environm & Soil Fertilizer, Fuzhou 350013, Peoples R China
3.Yueyang Agr Res Acad, Sci Observat & Expt Stn Yueyang, Minist Agr, Yueyang 414021, Peoples R China
关键词： Manure application; P fractions; and C -cycling functional genes; and C -coupling transformation; P and C loss risk
期刊名称：SOIL & TILLAGE RESEARCH （ 影响因子：6.8； 五年影响因子：7.8 ）
ISSN： 0167-1987
年卷期： 2025 年 251 卷
页码：
收录情况： SCI
摘要： Phosphorus (P) is a crucial macronutrient for crop yield. Repeated swine manure application can provide considerable amounts of P and organic carbon (C) for agricultural soils. However, a deeper understanding of the transformation of soil P fractions and their coupling with organic C cycling through chemical and biological processes is urgently needed to enhance P utilization efficiency and C sequestration. A seven-year swine manure application (SSMA) experiment was conducted at varying rates (0, 7.5, 15, 30, and 45 t.ha-1 per year) to investigate the changes in P fractions, the coupling of P and C transformation, and the driving factors in acidic soils. The results revealed that SSMA significantly increased soil total P, predominantly as inorganic P (Pi), whereas organic P (Po) exhibited a limited increase and plateaued at 15 t.ha-1 manure application. The 15-45 t.ha-1 manure treatments dramatically enhanced the nonstable P fractions, particularly pH- and Ca-induced Ca8P; moreover, Ca8-P had a greater impact on Olsen-P than Fe-P and Al-P. SSMA promoted P mobilization by increasing alkaline phosphatase activity and the abundance of P-cycling functional genes. However, the primary factors directly affecting nonstable P fractions were the elevated soil pH and soil organic carbon (SOC). Additionally, nonstable P fractions were positively correlated with O-aryl-C and ketone-C components. Swine manure applications altered organic C components by stimulating SOC-driven enzyme activities involved in organic C degradation. Organic C components were also influenced by available P and N, primarily through the abundance of genes involved in organic C fixation rather than C degradation. Furthermore, 45 t.ha-1 SSMA treatment restricted the increase in the abundance of P-cycling genes, most C-cycling genes, and dominant bacteria harboring P-cycling genes. This study provides critical insights into the coupling transformation mechanisms of P and C and highlights that excessive swine manure application impairs functional bacterial growth and organic C storage in addition to increasing the risk of P loss in agricultural soils.
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