Reinforced soil salinization with distance along the river: A case study of the Yellow River Basin

Clarifying the relationship between salt-affected soils and their adjacent river systems is critical to address challenges posed by soil salinization on agricultural production. Among various biophysical land management factors linked salinization, few studies have investigated importance of distance along river. Based Hetao Irrigation District Yellow River Basin, we collected 5314 samples analyzed 17 parameters explore Soil was reinforced river, as a trade-off ion accumulation nutrient regulation. total water-soluble salt content increased 16.4 mg kg?1 every kilometer, likely due ions leaching from upstream partially accumulating in downstream, especially for Cl-, SO42-, Na+. Greater input less solubility Ca2+ based amendments, phosphorus fertilizers, organic materials may explain declines Ca2+, available phosphorus, matter with With kilometer exchangeable sodium cation exchange capacity 8.89 × 10?4 1.26 10?2 cmol kg?1, respectively, which led an increase percentage 9.59 10?5. The mainly Na+ accumulation, while regulated nitrogen. pH 1.21 10?3 per associated decrease matter. Future saline amelioration reutilization initiatives at regional scales be improved accounting changes physicochemical properties resulting