Long-term fertilization alters chemical composition and stability of aggregate-associated organic carbon in a Chinese red soil: evidence from aggregate fractionation, C mineralization, and C-13 NMR analyses

文献类型： 外文期刊

第一作者： Mustafa, Adnan

作者： Mustafa, Adnan;Hu, Xu;Shah, Syed Atizaz Ali;Abrar, Muhammad Mohsin;Maitlo, Ali Akbar;Boren, Wang;Nan, Sun;Minggang, Xu;Maitlo, Ali Akbar;Kubar, Kashif Ali;Saeed, Qudsia;Kamran, Muhammad;Naveed, Muhammad;Boren, Wang

作者机构：

关键词： Red soil; Aggregate fractionation; Manure; C-sequestration; NMR; Aromaticity

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：2.763； 五年影响因子：2.998 ）

ISSN： 1439-0108

年卷期：

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收录情况： SCI

摘要： Purpose Long-term fertilization is a widely accepted strategy to enhance soil organic (SOC). However, fertilization effects on the stability of aggregate-associated OC remained largely unknown. Thus, stability of aggregate-associated OC was studied through aggregate fractionation, C-mineralization, and C-13 NMR analyses. Materials and methods Three aggregates (macro-aggregates, micro-aggregates, and silt + clay) were separated and analyzed for SOC contents, C-mineralization, and C-13 NMR analysis, for the following fertilization modes: control (CK), inorganic (NPK), and NPK combined with manure (NPKM). Results and discussion Highest contents (12.3-15.4 g kg(-1) aggregate) for SOC were obtained in macro-aggregates under NPK and NPKM application which were 47 and 85% higher than CK. Under the applied treatments, the highest CO2-C mineralization (mg kg(-1) soil) was observed for macro-aggregates and least for silt + clay fractions indicating high stability of OC associated with silt + clay fraction. Moreover, manure combined with inorganic fertilizer (NPKM) considerably lowered C-mineralization (per unit SOC) in aggregates and bulk soil suggesting high potential of manure addition to stabilize SOC through minimizing proportional to total aggregate or bulk soil OC decomposition. Furthermore, C-13 NMR analysis revealed carbonyl-C as the chief C-functional group sequestered. Manure application greatly enhanced SOC stability indices AI, HI, and A/OA which further indicates high SOC stability under manure addition. Conclusion Silt + clay fraction was more capable of protecting SOC against decomposition and manure combined with inorganic fertilizer not only had the potential to sequester more C but could also improve the stability of sequestered SOC associated with different aggregates.

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