Effects of mulch drip irrigation on the coupled heat-Fe drive in root zone soils and analysis of soil Cr(Ⅵ) remediation mechanism

IF 6.8 1区农林科学 Q1 SOIL SCIENCE

Soil & Tillage Research Pub Date : 2025-09-22 DOI:10.1016/j.still.2025.106884

Mingxuan Liu , Qiang Fu , Tianxiao Li , Renjie Hou , Xiangyu Wang , Ping Xue , Xuechen Yang , Mo Li , Dong Liu , Fanying Kong

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引用次数: 0

Abstract

Developing innovative agricultural remediation technologies to mitigate the threat of hexavalent chromium (Cr(VI)) to crop growth and development. In this study, four drip irrigation treatments: silver mulch (S), transparent mulch (T), black mulch (B), and no cover (CK), to investigate the mechanisms by which mulch-drip irrigation technology to drive Cr(VI) remediation through heat-Fe redox coupling in black soil. The results indicated that mulched drip irrigation alters soil thermal dynamics via photothermal regulation. Fe redox cycling exhibits color-dependent characteristics, and Cr(VI) distribution is synergistically regulated by heat-iron metabolism. The B treatment provided short-term remediation of Cr(VI) through Fe²⁺ chemical reduction facilitated by microbial activity; however, the mid-soil layer (10 ∼ 30 cm) was reactivated (CV= 0.22) due to redox shock, indicated by an Eh rebound of 71.61 mV). The T-treatment drives deep enrichment of Cr(VI) due to its high heat capacity and thermal diffusivity, whereas the S treatment establishes a pattern of “surface depletion - mid-layer locking.” This study provides a theoretical basis and technical optimization direction for the remediation of heavy metal pollution in agricultural land.

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覆盖滴灌对根区土壤热铁耦合驱动的影响及土壤Cr修复机制分析(Ⅵ

开发创新的农业修复技术，减轻六价铬（Cr(VI)）对作物生长发育的威胁。本研究以四种滴灌处理：银色覆盖(S)、透明覆盖(T)、黑色覆盖(B)和无覆盖（CK）为研究对象，探讨覆盖-滴灌技术通过热-铁氧化还原耦合驱动黑土Cr（VI）修复的机制。结果表明，膜下滴灌通过光热调节改变土壤热动态。铁的氧化还原循环表现出颜色依赖性，Cr（VI）的分布受热铁代谢的协同调节。B处理通过微生物活性促进的Fe2+化学还原对Cr（VI）进行短期修复；然而，由于氧化还原冲击，土壤中层（10 ~ 30 cm）被重新激活（CV= 0.22）， Eh反弹为71.61 mV)。由于其高热容量和热扩散性，t处理驱动Cr（VI）的深度富集，而S处理建立了“表面耗尽-中间层锁定”的模式。本研究为农用地重金属污染的修复提供了理论依据和技术优化方向。

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来源期刊

Soil & Tillage Research 农林科学-土壤科学

CiteScore

13.00

自引率

6.20%

发文量

266

审稿时长

5 months

期刊介绍： Soil & Tillage Research examines the physical, chemical and biological changes in the soil caused by tillage and field traffic. Manuscripts will be considered on aspects of soil science, physics, technology, mechanization and applied engineering for a sustainable balance among productivity, environmental quality and profitability. The following are examples of suitable topics within the scope of the journal of Soil and Tillage Research: The agricultural and biosystems engineering associated with tillage (including no-tillage, reduced-tillage and direct drilling), irrigation and drainage, crops and crop rotations, fertilization, rehabilitation of mine spoils and processes used to modify soils. Soil change effects on establishment and yield of crops, growth of plants and roots, structure and erosion of soil, cycling of carbon and nutrients, greenhouse gas emissions, leaching, runoff and other processes that affect environmental quality. Characterization or modeling of tillage and field traffic responses, soil, climate, or topographic effects, soil deformation processes, tillage tools, traction devices, energy requirements, economics, surface and subsurface water quality effects, tillage effects on weed, pest and disease control, and their interactions.