Dynamic Simulation of Soil Salt Transport in Arid Irrigation Areas under the HYDRUS-2D-Based Rotation Irrigation Mode
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This research aims to explore the dynamic transport of water and salt in soil under different irrigation modes and disclose the desalting effect of different irrigation factors in inland arid irrigation areas. Jingdian Irrigation District in Gansu Province, which is located in the arid region of Northwest China, is selected as a typical experimental area. Soil water and salt dynamic migration model is constructed based on HYDRUS-2D software, and field irrigation experiments are designed according to actual irrigation conditions in crop growth period. The model is used to simulate the salt transport process between saturated soil and unsaturated soil as well as the effects of different irrigation quotas, irrigation rounds and quota allocations on soil desalting. Through simulation, the vertical movement pattern of water and salt in the soil of the test area is analyzed, and the optimal design of the soil desalting irrigation plan is carried out. The results demonstrate that: after two-round irrigation, the average soil salinity of the tillage layer at each test points decreases significantly under evapotranspiration; the infiltration of irrigation water has an obvious impact on soil desalting; the deviation between the simulated and the measured value is less than 0.5%, which proves the model fitting result reliable; with fixed irrigation cycle and times, the soil desalting efficiency is higher when the irrigation quota falls in the range of 4000 ~ 6000 m3/hm2; when the first round of irrigation water only saturates the moisture content and gradually increases the irrigation quota in the subsequent rounds, it is more conducive to the dissolution and discharge of soil salinity. In summary, the results of this study can provide technical support for the protection of water and soil resources, as well as the improvement of saline-alkali land in inland arid irrigation areas.
KeywordsArid irrigation area Rotation flow HYDRUS-2D model Water and salt movement Desalination effect
National Natural Science Foundation of China (51279064; 51579102).
- Cai Axing CZ, Zhengqi J et al (1997) Relationship between salt content and conductivity in different saline areas in China. Soil Sci 29(1):54–57Google Scholar
- Lin Lin YJ, Liangsheng S, Fachao Z (2007) Simplified model of solute transport in regional saturated-unsaturated porous media. J Hydraul Eng 38(3):342–348Google Scholar
- Liu J (2012) Characteristics and numerical simulation of salinized soil with plastic mulch on water and salt migration under evaporation conditions. Dissertation. Xi'an University of TechnologyGoogle Scholar
- Lv Guijun KS, Fucang Z et al (2006) Study on water and salt law of motion of salinized soil under different infiltration conditions. Yellow River 28(4):52–54Google Scholar
- Wang Shuixian DX, Bin W et al (2012) Numerical simulation and control mode of soil water and salt movement in arid salinization region. Transactions of the Chinese Society of Agricultural Engineering 28(13):142–148Google Scholar
- Xiang-Shun S, Xi-F.T., Qi S, et al (2016) Research Progress on Soil Moisture and Salt Movement. Guangzhou Chemical IndustryGoogle Scholar
- Xu Cundong NJ, Hui L et al (2015) Simulation of soil water and salt transport under the conditions of flooding irrigation in Yellow River pumping-irrigation arid region. Yellow River 37(08):140–144Google Scholar
- Xu Cundong ZH, Liwei H (2014) Characteristic monitoring of groundwater-salt transportation and input-output in inland arid irrigation area. J Environ Biol 35(3):1181–1189Google Scholar
- Yu Genjian HJ, Zhanyi G (2013) Study on water and salt transportation of different irrigation modes by the simulation of HYDRUS model. J Hydraul Eng 44(7):826–834Google Scholar
- Zhao Zhicai FS, Zailin H, Jing J, Juntao Q (2010) Distribution characteristics of water and salt in a spring wheat soil under brackish water irrigation. Chin J Appl Ecol 21(4):945–951Google Scholar
- Zhou H, Wang S, Xuchun WU (2014) Micro drip irrigation district environmental impact on soil water and salt transport. Adv Water Sci 25(6):816–824Google Scholar