数字农科院2.0

Compositional evolution of dissolved organic matter mobilized by straw incorporation and its climate-driven interactions with lead in cold-region black soil: decoding mechanisms through PARAFAC and complexation modeling

文献类型： 外文期刊

作者： Song Cui;Lu Liu;Fuxiang Zhang;Qiang Fu;Chao Ma;Yongzhen Ding

作者机构：

关键词： Binding ability;Dissolved organic matter;Heavy metals;Spectral characteristics;Straw incorporation

期刊名称： Carbon Research

ISSN： 2731-6696

年卷期： 2025 年 4 卷 1 期

页码：

收录情况： EI（2025版）

摘要： Straw incorporation fundamentally alters the characteristics of soil dissolved organic matter (DOM), simultaneously influencing the mobility and bioavailability of heavy metals. However, environmental conditions significantly impact both the decomposition structure and dynamics of straw, as well as the properties of DOM. This study systematically investigated DOM dynamics in soils amended with straw under aging conditions of freeze–thaw cycles (FT) and wet-dry alternation (WD), employing parallel faction analysis (PARAFAC) coupled with complexation modeling to unravel DOM-lead (Pb) binding mechanisms. Results demonstrated that straw incorporation consistently increased levels of dissolved organic carbon (DOC) and acid-soluble Pb fractions. Notably, FT treatments reduced acid-soluble Pb content by 13.6% (straw-amended) and 11.6% (non-amended), whereas WD treatments increased it by 51.8% (straw-amended) and 30.7% (non-amended). Spectroscopic evidence revealed that DOM-Pb interactions preferentially enriched highly aromatic components within DOM matrices. Stability constants (lg K) of DOM-Pb complexes in uncontaminated soils were significantly higher under WD alternation compared to FT cycles (FSDOM: 3.3–3.9; WSDOM: 4.3–4.5). Furthermore, PARAFAC identified three humic-like substance fluorescence components (peak A, peak C and peak D), each exhibiting distinct Pb-binding affinities. This study elucidated the mechanistic underlying climate-driven DOM evolution and its implications for Pb remobilization in straw-amended soils, thereby providing a critical framework for optimizing strategies involving exogenous organic matter in the remediation of heavy metal-contaminated soils.

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