ABSTRACT This study investigated the potential influence of three organic ameliorators (peat, biochar and leonardite) on salts and nutrients in salt-affected soils during intermittent leaching. Results showed that nearly 90% of salt was removed from columns in the leaching process and sodium adsorption ratio (SAR) of the soil after leaching was reduced by 67.3% (control, CK), 62.9% (peat), 70.1% (biochar) and 55.0% (leonardite). Total N loss declined by 26.2% (peat), 11.7% (biochar) and 55.5% (leonardite) compared with CK in the process of leaching. The maintaining N (NH4+ and NO3−) of soil after leaching was 8.25, 7.31, 11.31 and 14.48 mg/kg for CK, peat, biochar and leonardite treatments. Final P loss was 0.47, 0.31, 0.54, 0.27 mg/column in leaching for CK, peat, biochar and leonardite treatments. Soluble P of soil after leaching was measured as 6.95 (CK), 5.62 (peat), 8.52 (biochar) and 3.33 (leonardite) mg/kg. Leaching could remove the salt effectively but with nutrient loss in the process. The findings of this study suggest that organic ameliorators (biochar, peat or leonardite) play an important role in retaining nutrients during leaching as well as supplying nutrients after leaching to offer practical assistance for the amendment of salt-affected soil in the Yellow River Delta.

中文翻译：

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有机改良剂作用下盐渍土浸出过程中盐分和有效养分的变化

摘要 本研究调查了三种有机改良剂（泥炭、生物炭和风化褐煤）在间歇浸出过程中对盐影响土壤中盐分和养分的潜在影响。结果表明，浸出过程中近90%的盐分从柱体中去除，浸出后土壤的钠吸附率（SAR）降低了67.3%（对照，CK）、62.9%（泥炭）、70.1%（生物炭）和 55.0%（风化褐煤）。在浸出过程中，与CK相比，总氮损失量分别下降了26.2%（泥炭）、11.7%（生物炭）和55.5%（风化岩）。对于 CK、泥炭、生物炭和风化岩处理，浸出后土壤的 N（NH4+ 和 NO3-）维持量分别为 8.25、7.31、11.31 和 14.48 mg/kg。对于 CK、泥炭、生物炭和风化岩处理，最终 P 损失为 0.47、0.31、0.54、0.27 毫克/柱。浸出后土壤的可溶性 P 测量值为 6.95 (CK)、5.62 (泥炭)、8.52 (生物炭) 和 3.33 (风化褐煤) mg/kg。浸出可以有效去除盐分，但在此过程中会损失养分。本研究结果表明，有机改良剂（生物炭、泥炭或风化褐煤）在浸出过程中保留养分以及浸出后提供养分方面发挥着重要作用，为黄河三角洲盐渍化土壤的改良提供了实际帮助。