Articles | Volume 22, issue 7
https://doi.org/10.5194/bg-22-1745-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-1745-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
09 Apr 2025
Research article |
| 09 Apr 2025
| 09 Apr 2025
Solubility characteristics of soil humic substances as a function of pH: mechanisms and biogeochemical perspectives
Xuemei Yang
School of Earth System Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China
Institute of Ecology, College of Urban and Environmental Sciences, Peking University, Beijing, 100091, China
Jie Zhang
School of Earth System Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China
School of Earth System Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China
Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, Tianjin 300072, China
Mohammad Mohinuzzaman
School of Earth System Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China
Department of Environmental Science and Disaster Management, Noakhali Science and Technology University, Noakhali, Bangladesh
H. Henry Teng
School of Earth System Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China
Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, Tianjin 300072, China
Nicola Senesi
Dip.to di Scienze del Suolo, della Pianta e degli Alimenti, Università degli Studi di Bari “Aldo Moro”, Via G. Amendola 165/A, 70126 Bari, Italy
Giorgio S. Senesi
CNR – Istituto per la Scienza e Tecnologia dei Plasmi (ISTP) – sede di Bari Via Amendola, 122/D, 70126 Bari, Italy
Jie Yuan
College of Resources and Environment, Xingtai University, Quanbei East Road 88, Qiaodong District, Xingtai City, Hebei Province, China
Yu Liu
School of Earth System Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China
Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, Tianjin 300072, China
Si-Liang Li
School of Earth System Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China
Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, Tianjin 300072, China
Xiaodong Li
School of Earth System Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China
Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, Tianjin 300072, China
Baoli Wang
School of Earth System Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China
Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, Tianjin 300072, China
Cong-Qiang Liu
CORRESPONDING AUTHOR
School of Earth System Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China
Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, Tianjin 300072, China
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Cited
13 citations as recorded by crossref.
- Impact of land-use conversion from a long-term paddy to abandoned field on the distribution of C, N, and trace elements: a study in central Viet Nam N. Toan et al.
- Diversified Cropping Combined with Biochar Application Enhances Soil Fertility, Biodiversity, and Crop Productivity in a Coastal Saline–Alkali Soil X. Qiu et al.
- Humic Substance Recovery from Reverse Osmosis Concentrate of a Landfill Leachate Treatment via Nanofiltration L. Barbosa Alves et al.
- Sustainable Valorization of Tomato Waste Through Composting with Nematode-Suppressive Potential N. Zrikam et al.
- Photo–biodegradation drives organic matter-mediated carbon–nitrogen–sulfur cycling in the reservoir's surface-layer: A multi-index analysis H. Wang et al.
- Dissolved organic matter influences the activation and release risks of arsenic and thallium in mine stream sediments J. Cao et al.
- Iron-modified cement hydration regulates DOM transformation and carbon stabilization in soil-concrete systems during rainfall-runoff Q. Li et al.
- Warming Intensifies Nitrogen-Driven Destabilization of Alpine Soil-Dissolved Organic Matter Y. Cao et al.
- A proton-gated channel identified in the centipede antenna W. Dong et al.
- Chemical–microbial mechanisms underlying a synergistic strategy combining low-accumulating wheat and soil amendment to mitigate Cd, Pb and As uptake D. Liu et al.
- Buffering failure of the ratio of secondary to primary phases: Risk overestimation of soil heavy metals under alkaline conditions Y. Wu et al.
- Effects of biochar co-application with pig manure, steel slag, and bentonite on contaminated soil remediation and wheat growth, antioxidant capacity, and mercury and cadmium uptake Y. Bai & X. Lan
- Optimizing the Cow Manure-Straw Ratio to Promote Organic Matter Humification: Insights from Three-Dimensional Fluorescence Spectroscopy L. Hao et al.
13 citations as recorded by crossref.
- Impact of land-use conversion from a long-term paddy to abandoned field on the distribution of C, N, and trace elements: a study in central Viet Nam N. Toan et al.
- Diversified Cropping Combined with Biochar Application Enhances Soil Fertility, Biodiversity, and Crop Productivity in a Coastal Saline–Alkali Soil X. Qiu et al.
- Humic Substance Recovery from Reverse Osmosis Concentrate of a Landfill Leachate Treatment via Nanofiltration L. Barbosa Alves et al.
- Sustainable Valorization of Tomato Waste Through Composting with Nematode-Suppressive Potential N. Zrikam et al.
- Photo–biodegradation drives organic matter-mediated carbon–nitrogen–sulfur cycling in the reservoir's surface-layer: A multi-index analysis H. Wang et al.
- Dissolved organic matter influences the activation and release risks of arsenic and thallium in mine stream sediments J. Cao et al.
- Iron-modified cement hydration regulates DOM transformation and carbon stabilization in soil-concrete systems during rainfall-runoff Q. Li et al.
- Warming Intensifies Nitrogen-Driven Destabilization of Alpine Soil-Dissolved Organic Matter Y. Cao et al.
- A proton-gated channel identified in the centipede antenna W. Dong et al.
- Chemical–microbial mechanisms underlying a synergistic strategy combining low-accumulating wheat and soil amendment to mitigate Cd, Pb and As uptake D. Liu et al.
- Buffering failure of the ratio of secondary to primary phases: Risk overestimation of soil heavy metals under alkaline conditions Y. Wu et al.
- Effects of biochar co-application with pig manure, steel slag, and bentonite on contaminated soil remediation and wheat growth, antioxidant capacity, and mercury and cadmium uptake Y. Bai & X. Lan
- Optimizing the Cow Manure-Straw Ratio to Promote Organic Matter Humification: Insights from Three-Dimensional Fluorescence Spectroscopy L. Hao et al.
Saved (final revised paper)
Latest update: 30 Apr 2026
Short summary
The solubility characteristics of soil humic acids (HAs), fulvic acids (FAs), and protein-like substances (PLSs) at varying pH levels remain unclear. The key findings include the following: HA solubility increases with increasing pH and decreases with decreasing pH; HApH6 and HApH1 contribute to 39.1–49.2% and 3.1–24.1% of dissolved organic carbon, respectively; and HApH2, FA, and PLSs are highly soluble at acidic pHs and are transported by ambient water. These issues are crucial for sustainable soil management.
The solubility characteristics of soil humic acids (HAs), fulvic acids (FAs), and protein-like...
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