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Objective This study aims to reveal the differences in infiltration processes of soda saline-alkali soils with different degrees and their influencing factors， and to evaluate the applicability of different infiltration models in simulating the infiltration process of soda saline-alkali soils. Methods Using the one-dimensional vertical constant-head single-ring infiltration method， field in-situ infiltration experiments were conducted to study the characteristics of infiltration process parameters in soda saline-alkali soils with different degrees， analyze the effects of salinization-alkalization indicators on the infiltration process， and evaluate the applicability of different prediction models. Results 1） As pH increased from 9.31 to 10.35， exchangeable sodium percent （ESP） rose from 1.09% to 65.82%， and sodium adsorption ratio （SAR） increased from 1.24 to 115.71， the stable infiltration rates of the five tested soils decreased by 41.81% to 99.59% compared with the initial infiltration rates. Among them， the Suaeda salsa land with the highest degree of salinization and alkalization showed the largest decrease， with a stable infiltration rate of only 0.13 mm/h. 2） Correlation analysis indicated that the stable infiltration rate was significantly negatively correlated with ESP and pH （p<0.01）， and significantly negatively correlated with exchangeable Na⁺ （p<0.05）. The average infiltration rate was significantly negatively correlated with ESP， exchangeable Na⁺， SAR， pH， and salt content at different levels. 3） Based on the coefficient of determination （R²） of the models and the correlation with the saline-alkali indicators of soda saline-alkali soils with different degrees， the simulation performance of the Horton infiltration model was superior to that of the general empirical model when SAR<108.60， salt content （SC）<10 568.64 mg/kg， and electrical conductivity （EC）<1.70 mS/cm. When the degree of salinization and alkalization exceeded this range， the general empirical model performed better. Conclusion The degree of soda salinization and alkalization is a key factor constraining soil infiltration capacity. The applicability of infiltration models for soils with different degrees of salinization and alkalization can be optimized based on thresholds of typical saline-alkali indicators. These findings provide a theoretical basis and methodological support for simulating water movement and managing irrigation and drainage in soda saline-alkali soil regions.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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