Five years of biochar amendment combined with reduced fertilization and irrigation improved the soil organic carbon composition and structure in a solonchak

文献类型： 外文期刊

第一作者： Pei, Jin

作者： Pei, Jin;Li, Wenwen;Zhao, Xiaoning;Liang, Yinku;Zhao, Xiaoning;Liang, Yinku;Zhao, Xiaoning;Xue, Lihua;Sun, Shiren;Zamanian, Kazem;Zhang, Sheng

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关键词： Soil organic carbon fractions; Soil organic carbon structure; Biochar application; Saline-alkali soils

期刊名称：SCIENTIFIC REPORTS （ 影响因子：3.9； 五年影响因子：4.3 ）

ISSN： 2045-2322

年卷期： 2025 年 15 卷 1 期

页码：

收录情况： SCI

摘要： Biochar application can increase cultivated soil organic carbon (SOC) and fertility, especially in saline-alkali soils facing climate change and salinization. To evaluate the effects of biochar application on SOC composition and structure, a 5-year maize field trial (2019-2023) was conducted in the Tarim River Basin, involving seven treatments with the following respective mineral N inputs (kg N ha(-1)), irrigation levels (mm) and biochar amendments (t ha(-1)): CONTROL (untreated soil), LNLW (100, 140, and 0), LNLWB (100, 140, and 10), MNMW (200, 220, and 0), MNMWB (200, 220, and 10), HNHW (300, 320, and 0), and HNHWB (300, 320, and 10). The SOC characteristics were analyzed after harvest. The results revealed that LNLWB produced the greatest increases in SOC (+61%), mineral-associated organic carbon (+54%), light fraction organic carbon (LFOC) (+322%), heavy fraction organic carbon (+3.5%), alkyl carbon/alkoxyl carbon ratio (+40%) and maize yield (+16%) but resulted in the greatest reduction in dissolved organic carbon (-37%), pore probability entropy (-0.8%) and fractal dimension (-6%). Biochar application increased SOC through increased LFOC and soil porosity and increased SOC stability through increased aromatic and humic properties, ultimately increasing yields. Biochar application resulted in significantly higher comprehensive scores (0.57 similar to 0.74) than treatments without biochar application (-0.56 similar to-0.49) based on principal component analysis of the SOC content and structure, and LNLWB had the highest score. Under greater biochar contributions, even 2/3 reduced N input (LNLW) performed well and represented the best low-carbon strategy in saline-alkali soils.

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