Effects of root growth on salt leaching and soil structure improvement in saline soils: A case study of Suaeda salsa

IF 5.9 1区农林科学 Q1 AGRONOMY

Agricultural Water Management Pub Date : 2025-05-08 DOI:10.1016/j.agwat.2025.109533

Yanyan Wang , Tongkai Guo , Changyan Tian , Ke Zhang , Zhenyong Zhao , Xiaomin Mao , Wenxuan Mai

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引用次数: 0

Abstract

Halophytes reduce soil salinity through significant shoot salt accumulation and facilitation of salt leaching. However, quantitative evidence on how Suaeda salsa L. (S. salsa) roots interact with saline soil to facilitate salt leaching remains limited. This study investigated the effects of S. salsa planting on salt removal, soil salinity, and soil quality under four soil salinity levels (0.1 % none-saline, 0.6 % lightly saline, 1.1 % moderately saline, and 2.6 % severely saline soils) using soil column experiments. Results showed that S. salsa planting significantly reduced soil salinity in the 0–20 cm layer. In lightly to moderately saline soils (0.6 %–1.1 % salt content), above-ground Na removal accounted for 12.1 %–19.3 % of soil total Na; in severely saline soils (2.6 % salt content), this dropped to 4.3 %. Compared with bare saline soil, S. salsa planting improved soil quality through increasing total soil porosity (TSP) by 51.6 %–109.6 %, pore connectivity (PC) by 144.5 %–550.7 % in the 0–20 cm layer; enhancing saturated hydraulic conductivity (Ks) by 100.7 %−373.8 %, and reducing bulk density (BD) by over 4.0 % in 0–100 cm soil profile. Correlation analysis revealed that root length (RL) and root average diameter (RAD) were positively correlated with TSP, PC, connected pore numbers (CPN), and Ks but negatively correlated with BD and soil moisture (SM). Root-induced soil quality improvements promoted salt leaching in the 0–20 cm layer, achieving desalination rates of 45.5 %–54.8 % in lightly to moderately saline soils and 24.6 % in severely saline soils. Furthermore, S. salsa planting reduced topsoil salt accumulation, decreasing salinity by over 55.0 % in the 0–20 cm layer compared to uncultivated soils. Therefore, continuous cultivation of S. salsa is an effective biological strategy for remediating saline-alkali land by improving soil quality and promoting salt removal.

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盐碱地根系生长对盐淋溶和土壤结构改善的影响——以沙特阿拉伯为例

盐生植物通过显著的茎部盐积累和促进盐淋失来降低土壤盐分。然而，关于salsa L. （S. salsa）根系如何与盐碱地相互作用以促进盐淋出的定量证据仍然有限。采用土柱试验研究了4种土壤盐分水平（0.1 %无盐、0.6 %轻度盐、1.1 %中度盐和2.6 %重度盐）下莎草种植对土壤盐分去除、土壤盐分和土壤质量的影响。结果表明，种植莎莎显著降低了0 ~ 20 cm层土壤盐分。在轻度至中度盐渍化土壤中（含盐量0.6 % ~ 1.1 %），地上Na去除率占土壤总Na的12.1 % ~ 19.3 %；在严重盐碱地（含盐量为2.6 %），这一比例下降到4.3 %。与裸盐渍土相比，在0 ~ 20 cm土层中，种植沙草提高了土壤总孔隙度（TSP） 51.6 % ~ 109.6 %，孔隙连通性（PC） 144.5 % ~ 550.7 %，改善了土壤质量；在0-100 cm土壤剖面中，饱和水导率（Ks）提高100.7% % ~ 373.8 %，容重（BD）降低4.0% %以上。相关分析表明，根长（RL）和根平均直径（RAD）与TSP、PC、连通孔数（CPN）和Ks呈正相关，与BD和土壤水分（SM）呈负相关。根系诱导的土壤质量改善促进了0-20 cm层的盐淋溶，在轻度至中度盐渍土中实现了45.5% % - 54.8% %的脱盐率，在重度盐渍土中实现了24.6% %的脱盐率。此外，萨尔萨的种植减少了表层土壤的盐分积累，与未栽培的土壤相比，0-20 cm层的盐分减少了55.0 %以上。因此，连作萨尔萨是改善土壤质量、促进脱盐修复盐碱地的有效生物策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Agricultural Water Management 农林科学-农艺学

CiteScore

12.10

自引率

14.90%

发文量

648

审稿时长

4.9 months

期刊介绍： Agricultural Water Management publishes papers of international significance relating to the science, economics, and policy of agricultural water management. In all cases, manuscripts must address implications and provide insight regarding agricultural water management.