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| DOI：10.13522/j.cnki.ggps.2026057 |
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| Effects of different organic amendments on water infiltration and storage in black soil |
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Gu Kaidi, Wu Lipeng, Guan Xiaoyan, Huang Lichun, Liang Zhongyu, Qu Liuyan, Chen Haorui
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1. State Key Laboratory of Water Cycle and Water Security, China Institute of Water Resources and Hydropower Research,
Beijing 100038, China; 2. National Center for Efficient Irrigation Engineering and Technology Research-Beijing,
Beijing 100048, China; 3. Hinggan League Agricultural and Animal Husbandry Science Research Institute, Hinggan 137400, China
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| Abstract: |
| 【Objective】The capacity of soils to infiltrate and retain water is influenced by multiple abiotic and biotic factors. In this paper, we studied the effects of different organic amendments on water infiltration and storage in typical chernozem black soils in eastern Inner Mongolia.【Method】The experiment compared five amendments: straw alone, cattle manure alone, combined application of straw and humic acid, and combined application of cattle manure and humic acid, together with an unamended control. Changes in soil pore characteristics, soil water dynamics across the soil profile, and soil hydraulic properties were measured for each treatment.【Result】Compared to the control, organic amendments reduced soil bulk density in the 0-30 cm layer by 1.4%-6.5%, while increasing saturated hydraulic conductivity, field capacity, available water storage capacity, and mean infiltration rate by 23.8%-35.0%, 1.8%-17.8%, 14.1%-59.3%, and 87.8%-154.8%, respectively. Compared with amendment with straw or cattle manure only, their combined application with humic acid further increased saturated hydraulic conductivity by 6.5%, mean infiltration rate by 8.8%-11.9%, field capacity by 5.0%-14.8%, and available water storage capacity by 20.7%-36.2%. Structural equation modeling revealed that organic amendments significantly improved soil physical properties, particularly capillary porosity. By enhancing saturated hydraulic conductivity, capillary water capacity, and field capacity, organic amendments promoted water infiltration and increased soil water storage.【Conclusion】 Organic amendments improved soil hydraulic conductivity and water-retention capacity by modifying soil pore structure, with their effects further enhanced when straw or cattle manure was combined with humic acid. These combined organic amendments provide an effective approach to improve the hydraulic properties of chernozem black soil in Northeastern China. |
| Key words: organic materials soil pore characteristics soil water infiltration soil water storage capacity soil water characteristic parameters Northeast black soil |
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