数字农科院2.0

The response of soil organic carbon sequestration to organic materials addition in saline-alkali soil: from the perspective of soil aggregate structure and organic carbon component

文献类型： 外文期刊

作者： Zhang, Liuyu;Chen, Mengmeng;Zong, Yutong;Sun, Zeqiang;Li, Yuyi;Ding, Xiaodong;Zhang, Shirong

作者机构：

关键词： Soil aggregate stability;SOC pool;SOC sequestration;Exchangeable cations

期刊名称： PLANT AND SOIL

ISSN： 0032-079X

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： Background and aimsPromoting soil organic carbon (SOC) sequestration is the key to improving soil quality. Adding organic materials is a common practice to promote SOC sequestration. However, the mechanism of SOC sequestration in saline-alkali soil with different organic materials addition is still unclear.MethodsField experiment was conducted: (1) Control, no fertilization; (2) NPK, only mineral fertilizer addition; (3) OF, NPK plus 2000 kg C ha-1 addition of organic fertilizer; (4) MS, NPK plus 2000 kg C ha-1 addition of maize straw.ResultsCompared with NPK treatment, the mean weight diameter (MWD) in OF and MS treatments was increased by 23.08% and 11.54%, respectively, which was due to the reduction of exchangeable sodium saturation percentage. Exchangeable calcium and magnesium were positively correlated with MWD, and their contents in OF treatment were 6.89-32.05% higher than those in MS treatment. Meanwhile, MWD was positively correlated with SOC stock, and small macro-aggregates contributed the most to SOC. Compared with NPK treatment, the ratio of mineral-associated organic carbon to particular organic carbon in MS and OF treatments were increased by 34.06% and 80.88%, respectively. Exchangeable magnesium and calcium could bind with polysaccharide, carboxyl and phenol to form complex under organic materials addition. Hence, SOC stock in OF and MS treatments was increased by 14.18% and 6.38% compared to NPK treatment, respectively.ConclusionThe addition of organic materials improved the stability of aggregate structure and SOC pool in saline-alkali soil, thereby promoting SOC sequestration, in which organic fertilizer showed better effect.

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