Effect of fulvic acid on aggregate characteristics and humus composition in saline-alkali soil

IF 3.9 2区农林科学 Q1 AGRONOMY

Plant and Soil Pub Date : 2025-05-06 DOI:10.1007/s11104-025-07443-1

Rui Cai, Yaru Guo, Yanjie Li, Ling Li, Susu Xu, Ping Gong, Pengfei Li, Hongguang Liu

{"title":"Effect of fulvic acid on aggregate characteristics and humus composition in saline-alkali soil","authors":"Rui Cai, Yaru Guo, Yanjie Li, Ling Li, Susu Xu, Ping Gong, Pengfei Li, Hongguang Liu","doi":"10.1007/s11104-025-07443-1","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Background and Aims</h3><p>Organic amendments rich in fulvic acid (FA) offer a way to improve the water and salt distribution in saline-alkali soils and enhance soil quality. As soil humus promotes the formation of soil aggregates and improves soil quality, exploring the effects of FA on saline-alkali soil aggregates and humification is significant to understand the potential of fulvic acid in improving soil quality.</p><h3 data-test=\"abstract-sub-heading\">Methods</h3><p>This study examines severely saline-alkali cotton fields in Xinjiang through a two-year field experiment (2021–2022) using five FA application rates (0, 150, 300, 450, and 600 kg·ha<sup>−1</sup>) and evaluates their effects on soil structure and humus fractions through structural equation modeling (SEM).</p><h3 data-test=\"abstract-sub-heading\">Results</h3><p>FA application increased soil moisture by 6.16–18.64% and decreased salt content and pH by 4.07–20.87% and 0.57–1.90%, respectively, compared to standard fertilization. The application of FA improved soil aggregate stability, with optimization positively correlated to the amount applied. The soil humus components rose by 5.24–60.49%, and humification improved by 6.97–20.08%. Among them, the 600 kg·ha<sup>−1</sup> application rate yielded the most significant effects Additionally, SEM revealed that soil physical and chemical properties (path coefficient = 0.436, <i>p</i> < 0.001) and humus components (path coefficient = 0.442, <i>p</i> < 0.001) in saline-alkali cotton fields had a direct positive impact on soil humification. Additionally, soil aggregates indirectly enhanced humification by influencing humus content and soil properties.</p><h3 data-test=\"abstract-sub-heading\">Conclusion</h3><p>FA-mediated stabilization of soil aggregates, along with salt inhibition and improved soil moisture retention, enhances saline-alkali soil structure and accelerates humification. Therefore, the results provide technical and theoretical support for reducing nutrient loss and promoting sustainable management of saline-alkali soils.</p>","PeriodicalId":20223,"journal":{"name":"Plant and Soil","volume":"140 1","pages":""},"PeriodicalIF":3.9000,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Plant and Soil","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.1007/s11104-025-07443-1","RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRONOMY","Score":null,"Total":0}

引用次数: 0

Abstract

Background and Aims

Organic amendments rich in fulvic acid (FA) offer a way to improve the water and salt distribution in saline-alkali soils and enhance soil quality. As soil humus promotes the formation of soil aggregates and improves soil quality, exploring the effects of FA on saline-alkali soil aggregates and humification is significant to understand the potential of fulvic acid in improving soil quality.

Methods

This study examines severely saline-alkali cotton fields in Xinjiang through a two-year field experiment (2021–2022) using five FA application rates (0, 150, 300, 450, and 600 kg·ha⁻¹) and evaluates their effects on soil structure and humus fractions through structural equation modeling (SEM).

Results

FA application increased soil moisture by 6.16–18.64% and decreased salt content and pH by 4.07–20.87% and 0.57–1.90%, respectively, compared to standard fertilization. The application of FA improved soil aggregate stability, with optimization positively correlated to the amount applied. The soil humus components rose by 5.24–60.49%, and humification improved by 6.97–20.08%. Among them, the 600 kg·ha⁻¹ application rate yielded the most significant effects Additionally, SEM revealed that soil physical and chemical properties (path coefficient = 0.436, p < 0.001) and humus components (path coefficient = 0.442, p < 0.001) in saline-alkali cotton fields had a direct positive impact on soil humification. Additionally, soil aggregates indirectly enhanced humification by influencing humus content and soil properties.

Conclusion

FA-mediated stabilization of soil aggregates, along with salt inhibition and improved soil moisture retention, enhances saline-alkali soil structure and accelerates humification. Therefore, the results provide technical and theoretical support for reducing nutrient loss and promoting sustainable management of saline-alkali soils.

查看原文本刊更多论文

黄腐酸对盐碱土团聚体特性和腐殖质组成的影响

背景与目的富富黄腐酸的有机改良剂为改善盐碱地的水盐分布、提高土壤质量提供了一条途径。土壤腐殖质促进土壤团聚体形成，改善土壤质量，探索FA对盐碱土壤团聚体和腐殖质化的影响，对了解黄腐酸改善土壤质量的潜力具有重要意义。方法以新疆重度盐碱棉为研究对象（2021-2022年），采用5种FA施用量（0、150、300、450和600 kg·ha−1），通过结构方程模型（SEM）评价其对土壤结构和腐殖质组分的影响。结果与标准施肥相比，施用fa可使土壤含水量提高6.16 ~ 18.64%，使含盐量和pH值分别降低4.07 ~ 20.87%和0.57 ~ 1.90%。施用FA改善了土壤团聚体稳定性，且优化程度与施用量呈正相关。土壤腐殖质组分增加5.24 ~ 60.49%，腐殖质化程度提高6.97 ~ 20.08%。其中，600 kg·ha−1施用量对土壤理化性质的影响最为显著。0.001)和腐殖质成分(通径系数= 0.442,p <；0.001)对土壤腐殖质化有直接的正向影响。此外，土壤团聚体通过影响腐殖质含量和土壤性质间接促进腐殖质化。结论fa介导的土壤团聚体稳定作用，以及抑盐作用和土壤保水作用，增强了盐碱土结构，加速了腐殖质化。研究结果为减少盐碱地养分流失，促进盐碱地可持续管理提供了技术和理论支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Plant and Soil 农林科学-农艺学

CiteScore

8.20

自引率

8.20%

发文量

543

审稿时长

2.5 months

期刊介绍： Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.