Long-term manure application increased soil organic carbon and nitrogen mineralization through accumulation of unprotected and physically protected carbon fractions

文献类型： 外文期刊

第一作者： Ashraf, Muhammad Nadeem

作者： Ashraf, Muhammad Nadeem;Xu, Xiangru;Wu, Lei;Hu, Xu;Zhang, Wenju;Xu, Minggang;Ashraf, Muhammad Nadeem;Hu, Cheng;Aziz, Tariq;Aziz, Tariq;Waqas, Muhammad Ahmed;Farooq, Muhammad;Xu, Minggang

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关键词： fertilization strategy; grain yield; organic C fraction; organic matter stabilization; protection mechanism

期刊名称：PEDOSPHERE （ 影响因子：5.7； 五年影响因子：5.7 ）

ISSN： 1002-0160

年卷期： 2023 年 33 卷 2 期

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收录情况： SCI

摘要： Soil organic carbon (SOC) and nitrogen (N) mineralization are important biogeochemical processes associated with soil fertility. These processes are influenced by physically, chemically, and biologically stabilized SOC fractions, the mechanisms of which are not well known. The present study was conducted to evaluate the combined effect of manure and mineral fertilizers on the contents of SOC fractions to promote the mineralization of SOC and N. Treatments included: i) no fertilizer control (CK); ii) a combination of mineral N, phosphorus, and potassium fertilizers (NPK); iii) manure alone (M); iv) manure combined with NPK (MNPK); and v) a high dose of manure combined with NPK (hMNPK). The combined uses of manure and mineral fertilizers (MNPK and hMNPK) enhanced the accumulation of the unprotected coarse particulate organic carbon (C) fraction (cPOC) by 44%-72% compared to CK. Manure applications (M, MNPK and hMNPK) enhanced physically microaggregate-protected organic C (mu agg), physicochemically protected organic C within the microaggregate-derived silt (mu silt) fraction (H-mu silt), and physicobiochemically protected organic C within the mu silt fraction (NH-mu silt) by 30%-56%, 62%-150%, and 27%-51%, respectively. In contrast, all chemically and biochemically protected SOC fractions showed a minor response to manure application. Accumulation of cPOC, mu agg, H-mu silt, and physicochemically protected organic C within the microaggregate-derived clay fraction (H-mu clay) significantly contributed to the mineralization of SOC and N, resulting in a significant increase in rice grain yield with long-term manure application. In summary, long-term combined use of manure and mineral fertilizers improved SOC accumulation in unprotected and physically protected fractions, which enhanced SOC and N mineralization and benefited soil productivity in a rice-wheat cropping system.

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