| Cite this article: | 郭美美,李晓彬,万书勤,等.滴灌加酸处理调控滨海重度盐渍土脱盐过程中pH升高的研究[J].灌溉排水学报,0,():-. |
| guo mei mei,li xiaobin,wan shuqin,et al.滴灌加酸处理调控滨海重度盐渍土脱盐过程中pH升高的研究[J].灌溉排水学报,0,():-. |
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| Management of the increased pH using acid treated drip-irrigation during the desalinization process in the heavily coastal-saline soil |
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guo mei mei1,2, li xiaobin3, wan shuqin3, kang yaohu4,5
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1.Key Laboratory of Water Cycle and Related Land Surface Processes，Institute of Geographic Sciences and Natural Resources Research;2.College of Resources and Environment，University of Chinese Academy of Sciences;3.Key Laboratory of Water Cycle and Related Land Surface Processes，Institute of Geographical Sciences and Natural Resources Research;4.Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographical Sciences and Natural Resources Research;5.College of Resources and Environment University of Chinese Academy of Sciences
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| Abstract: |
| 【Objective】In order to came up with a low-cost, green, simple and efficient method for management the adverse effects of the significantly increased pH on plant growth during the desalination of heavily coastal-saline soils. The effect of the acid treated drip-irrigation on the increased pH during the desalination process of heavily coastal-saline soil was studied, using the method of drip fertigation combined with the industrial crude phosphoric acid that acted as both liquid phosphate fertilizer and acid regulator. 【Method】The simulating experiment in laboratory consisted of 5 different acid dosages for irrigation water, marked as S1 (IWpH=6), S2 (IWpH =6.5), S3 (IWpH =7), S4 (IWpH = 7.5), S5 (IWpH =8.2~8.5, no acid added). The temporal and spatial variation characteristics of soil salinity (electrical conductivity of the saturated paste extracts, ECe) and pHe (pH of the saturated paste extracts) under different leaching water volumes (60mm, 120mm, 180mm, 240mm) were studied. 【Result】Under drip irrigation conditions, a low-salt zone was first formed exactly below the emitter, and then the low-salt zone expanded and the soil salinity decreased logarithmically with the increase of irrigation water. The soil salt leaching process and leaching rate were similar under different acid treatments, while the dynamic change processes of soil pH were significantly different. When 240mm water was applied, the average soil pH in the 0~55cm soil layer of S1-S5 treatment was 7.73, 7.78, 7.86, 7.92, 7.92, respectively. The soil pH in the non-saline area (< 4 dS/m) of S1-S3 treatment increased first and then decreased, while the soil pH of S4-S5 treatment continued to increase at this period. It has been shown that the more amount of the acid was added, the shorter the period of soil pH increase was, the faster the soil pH fell back, and the lower pH was remained during the salt leaching process.【Conclusion】 The good soil acid-base environment in the plant rootzone was formed quickly and effectively, when the pH of irrigation water was kept between 6-7 by adding acid. Therefore, it was recommended that adding the industrial crude phosphoric acid and adopting the drip fertigation to create a suitable soil acid-base environment for plant growth during the process of salt leaching in coastal saline-alkali soils. |
| Key words: Coastal saline soil; Soil column simulation; Soil pH; Salinity; Leaching |
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