| Cite this article: | 吴瑞,胡正义,孙艺齐,等.室内模拟水分管理对土壤溶液磷浓度影响研究[J].灌溉排水学报,0,():-. |
| WU RUI,Hu Zheng Yi,Sun Yi Qi,et al.室内模拟水分管理对土壤溶液磷浓度影响研究[J].灌溉排水学报,0,():-. |
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| This article has been：Browse 2021Times Download 0Times |
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| Effects of Simulated Water Management on Phosphorus Concentration in Soil Solution |
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WU RUI1, Hu Zheng Yi2, Sun Yi Qi3, Geng Zi Qi2, Cui Yan Shan3
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1.College of resources and environment, University of Chinese Academy of Sciences;2.Sino-Danish College, University of Chinese Academy of Sciences;3.School of Resources and Environment, University of Chinese Academy of Sciences
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| Abstract: |
| 【Background】Concentration of phosphorus in soil solution not only affects plant growth, but also affects water quality. However, most of the current research focuses on soil phosphorus changes in the u surface layer, while the middle and lower layers also have important effects on plant growth and groundwater quality . In order to better explore the environmental behavior of phosphorus in different soil solutions under different water management modes【Objective】Therefore, it is significant to investigate the dynamics of phosphorus in soil solution and its influencing factors for the design of the project of returning farmland to wet soil. in addition , In order to better explore the environmental behavior of phosphorus in different soil solutions under different water management modes and refer to the design of reclamation and rehydration engineering 【Method】In this study, soil column experiment for 84 days was used to investigate three water management modes (mode 1: soil moisture content of 50%; Mode 2: soil moisture content of 75%; Model 3: soil moisture content of 100%) on the dynamics of phosphorus in solution of soil profile (0~10 cm in the surface layer, 10~20 cm in the middle layer, and 20~30 cm in the lower layer) and its relationship with TOC, total Fe, total Al, and total Ca in the soil solution. 【Result】The results showed that no soil solution was collected from the surface and middle soil under Mode 1, while soil solutions were collected from the lower layer under Model 1, and from all layers under Model 2 and Model 3 during the experiment. In Mode 2 and Mode 3, the concentration of phosphorus in the middle soil solution was the highest, which was 1.3~1.7 times that of the surface soil solution and 5.2~8.2 times that of the lower soil solution, respectively. Significant difference of concentration of phosphorus in soil solution was determined in dependence on soil layers. Concentration of phosphorus in soil solution follows the order as bellow: surface layer soil, Mode 3 (1.27 mg/L) > Mode 2 (0.82 mg/L); middle-layer soil: Mode 3 (1.60 mg/L) > Mode 2 (1.40 mg/L); lower layer soil: Mode 3 (0.31 mg/L) > Mode 2 (0.17 mg/L) >Model 1 (0.13 mg/L). Stepwise regression analysis indicated that the concentration of phosphorus in soil solution was related to TOC, total Fe, total Al, and total Ca in soil solution, and which was affected by water management mode and soil depth. It was revealed that soil water management could affect the dissolution and/or decomposition of various fractions of phosphorus in soil, which could drive the dynamics of phosphorus in soil solution. Concentration of phosphorus in soil solution under three water management modes was higher than the standard value of surface water eutrophication (0.1 mg/L), especially in mode 3. 【Conclusion】Therefore, the release of phosphorus in soils may cause a sudden increase of phosphorus in overlying water during the period of returning farmland to wetland, and Its ecological and environmental effect deserves our attention. |
| Key words: water management; soil solution; phosphorus; Sanjiang Plain; returning farmland to wetland |
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