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| DOI：10.13522/j.cnki.ggps.2017.0181 |
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| Spatiotemporal Distribution of pH and Its Relationship with Nutrients in Saline-alkali Soils During the Stages of Water Storage and Water Drainage |
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LI Gang, LU Nan, ZHU Daiwen
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Shaanxi Provincial Land and Engineering Construction Group Co., Ltd., Xi’an 710075, China; Institute of Land Engineering and Technology, Shaanxi Provincial Land EngineeringConstruction Group Co., Ltd., Xi’an 710075, China; Key Laboratory of Degraded and Unused Land Consolidation Engineering, the Ministry of Land and Resources of China, Xi’an 710075, China; Shaanxi Provincial Land Consolidation Engineering Technology Research Center, Xi’an 710075, China
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| Abstract: |
| 【Objective】?Soil pH affects many biotic and abiotic processes and in this paper we investigated its spatiotemporal distribution and relationship with nutrients in saline and alkaline soil during stages of water storage and water drainage.【Method】 Soil samples were taken from different locations in a field under water storage state and water drainage state; the pH, the content of organic matter, total nitrogen, available potassium and available phosphorus in 0~200 cm soil were analysed. 【Result】 Along with field measurement, the results showed that under both water storage and water drainage stages, the soil pH was in the range that did not have detrimental impact on plan growth. The mean soil pH during water storage period was lower than that during drainage period due to the decrease in oxygen. Correlation analysis and stepwise regression analysis revealed that the pH was linearly correlated with soil nutrients in the drainage period: correlated to soil organic matter with r=-0.709** and p<0.01, correlated to available phosphorus with r=-0.400** and p<0.01, correlated to available potassium with r=0.628** and p<0.01. During water storage period, in contrast, the relationship between pH and the nutrients was insignificant (p>0.05). 【Conclusion】 Water storage could effectively reduce salt content in the tillage layer, accelerating salt leaching, and saving the water and nutrients in subsoil horizon for plants to use. As such, it improved soil quality and efficacy of remediating saline and alkaline soils. |
| Key words: saline-alkali soil; water storage; drainage; pH value; soil nutrients |
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