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| Effect of degradable film covering on water evaporation of one-dimensional soil column |
| JIA Hao1, 2, LI Wenhao 1, 2*, WANG Zhenhua 1, 2, ZHANG Jinzhu 1, 2,WANG Jiulong 1, DING Hongwei 1, XU Hu 1 |
| 1. College of Water & Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832003, China; 2. Key Laboratory of Modern Water-saving Irrigation Corps, Shihezi, Xinjiang 832000, China |
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Abstract In order to solve the problem law of residual film pollution and explore the influence law of degradable film coverage on the soil water evaporation process, the indoor soil column evaporation test was carried out, and the effects of five types of cover layers(CK: no film, PE: ordinary ground film thickness 0.008 mm, BD1: type A degradation film thickness 0.010 mm, induction period 45 d, BD2: type B degradation film thickness 0.010 mm, 60 d of induction period, BD3: type C degradation film thickness 0.012 mm, 60 d of induction period)on soil water evaporation characteristics in two radiation modes(continuous and intermittent)were studied. The results show that film mulching has a significant effect on soil evaporation. Under continuous radiation evaporation, the cumulative evaporation of CK treatment is 34.2 mm. Compared with CK, the evaporation inhibition rates of PE, BD1, BD2, and BD3 treatments are 31.22%, 15.61%, 15.94%, and 15.35%, respectively. Under intermittent radiation evaporation, the cumulative evaporation of CK treatment is 32.5 mm. Compared with CK, the evaporation inhibition rates of PE, BD1, BD2, and BD3 treatments are 25.84%, 15.69%, 16.74%, and 12.15%, respectively. The inhibitory effect is as follows: PE> BD2> BD1> BD3> CK. In the same radiation method, the Rose model′s fitting effect of the cumulative evaporation of the degraded film treatment is better than that of other treatments. From the evaporation characteristics of the degraded film in the two radiation modes and its fitting effect, it can be concluded that the B-type completely biodegradable film is more effective in inhibiting water evaporation loss than the A and C-type completely biodegradable film, and its model fitting effect is better.
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Received: 20 September 2019
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