Enhancing soil organic carbon sequestration at different depths: The role of chitin-rich organic amendment in salt-affected soils

文献类型： 外文期刊

第一作者： Zhang, He

作者： Zhang, He;Li, Guihua;Zhang, Jianfeng;Zhang, He;De Clerck, Caroline;Degre, Aurore;Zhang, Jianfeng;Zhang, Jianfeng

作者机构：

关键词： Secondary saline soil; Greenhouse vegetable production; Organic amendment; Salt ions; Aggregate distribution and stability; Soil organic carbon

期刊名称：ENVIRONMENTAL TECHNOLOGY & INNOVATION （ 影响因子：7.1； 五年影响因子：7.1 ）

ISSN： 2352-1864

年卷期： 2025 年 40 卷

页码：

收录情况： SCI

摘要： Chitin-rich organic amendments are known for enhancing soil aggregation and mitigating salinity, yet their effects on subsoil organic carbon (SOC) remains underexplored. An experiment was conducted in a greenhouse vegetable production system, employing three treatments: CK (no amendment), SC (chitin-rich organic amendment), and ST (bio-organic amendment). Soil samples were collected from both the topsoil (0-20 cm) and subsoil (20-40 cm) layers. The results revealed significant increase in soil electrical conductivity (EC), salt ion content, labile SOC fractions under organic amendment treatments in both soil layers. In the topsoil, a notable reduction in pH and enhanced desalination rate were observed. The bio-organic amendment notably increased the proportion of large macroaggregates and aggregate stability in both layers. In contrast, the chitin-rich organic amendment specifically enhanced small macroaggregates in the topsoil and large macroaggregates in the subsoil (P < 0.05). Redundancy analysis identified soil pH as a crucial factor influencing topsoil aggregation, while EC, Mg-2(+), and Ca2+ were critical for subsoil aggregation. Organic amendments increased SOC, with higher Ca2+ and Mg2+ levels under lower pH in the topsoil improving aggregate stability. In the subsoil, elevated EC, primarily driven by increased Ca2+ and Mg2+ (excluding Na+), facilitated aggregate formation and accumulation of recalcitrant organic carbon, thereby contributing to SOC stabilization. These findings underscore the potential of chitin-rich and bio-organic amendments to improve soil structure and to enhance carbon sequestration in both topsoil and subsoil. This has important implications for sustainable soil management in secondary saline greenhouse vegetable systems.

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