| Effects of different residual film quantity on soil moisture movement and simulation |
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| DOI：10.7606/j.issn.1000-7601.2021.01.07 |
| Key Words: soil amount of residual film distribution of residual film infiltration rate evaporation rate |
| Author Name | Affiliation | | JIA Hao | School of Hydraulic Construction Engineering, Shihezi University, Shihezi, Xinjiang 832000, China
Key Laboratory of Modern Water Saving Irrigation Corps, Shihezi, Xinjiang 832000, China | | WANG Zhenhua | School of Hydraulic Construction Engineering, Shihezi University, Shihezi, Xinjiang 832000, China
Key Laboratory of Modern Water Saving Irrigation Corps, Shihezi, Xinjiang 832000, China | | ZHANG Jinzhu | School of Hydraulic Construction Engineering, Shihezi University, Shihezi, Xinjiang 832000, China | | LI Wenhao | School of Hydraulic Construction Engineering, Shihezi University, Shihezi, Xinjiang 832000, China | | GU Zhenda | School of Hydraulic Construction Engineering, Shihezi University, Shihezi, Xinjiang 832000, China |
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| Abstract: |
| In order to solve the residual film pollution in the oasis area, combined with existing research and based on the relationship between the amount of residual film in the farmland and the year of film coating, an experiment with nine kinds of residual film treatments (0, 50, 80, 132, 160, 264, 396, 792 kg·hm-2, and 1 320 kg·hm-2) was designed. Using the indoor soil column simulation test, we monitored and analyzed the migration distance, migration rate, cumulative evaporation, evaporation rate, and water content of the wet front under different treatments and simulated the model, also explored the influence of residual film amount on soil infiltration and evaporation, as well as the advantages and disadvantages of model simulation. The results showed that with increasing the residual film amount, the migration distance of the wet peak showed a decreasing trend, which was 2.76%~8.66% less than CK (P<0.05), the average migration rate within 0~5 h was 0.4%~19.5% less than CK (P<0.05), the overall trend was decreasing power function. As the amount of residual film increased, the cumulative evaporation gradually decreased between 5.04%~38.92% (P<0.05) compared with CK. The evaporation rate showed a decreasing trend, and with the evaporation time, the rate also decreased with a power function. The average water content of 0~10 cm was lower 1.51%~3.08% (P<0.05) than that of layers 10~20 cm, and the residual film destroyed the balance of soil water distribution. The results of evaluation model showed that the R2 of fitting results of each treatment was greater than 0.988. With the increase of residual film amount, the RRMSE value is different, the CRM value is close to 0, the CE value fluctuates, and the model fitting results show that the first change is better and then worse. |
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