| Cite this article: | 葛建坤,平盈璐,龚雪文,等.水分亏缺对温室覆膜滴灌番茄根系生长及吸水量的影响[J].灌溉排水学报,2022,():-. |
| GE Jiankun,PING Yinglu,GONG Xuewen,et al.水分亏缺对温室覆膜滴灌番茄根系生长及吸水量的影响[J].灌溉排水学报,2022,():-. |
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| Effects of water deficit on root growth and water uptake of tomato under?mulched?drip?irrigation in greenhouse |
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GE Jiankun1, PING Yinglu1, GONG Xuewen1, WANG Ling2, XIN Qingcong1, ZHANG Lei1, LIU Huanhuan1
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1.North China University of Water Resources and Electric Power;2.Yellow River Engineering Consulting Co.Ltd
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| Abstract: |
| 【Objective】Water stress and plastic film mulching are important factors affecting root growth.【Method】In order to explore the effects of water stress and plastic film mulching on root growth and root water uptake of tomato under drip irrigation in greenhouse, based on the cumulative evaporation (EP) of 20 cm standard evaporating dish and combined with plastic film mulching, three treatments were set up: high water treatment without film (WM-0.9, water surface evaporation coefficient is 0.9), high water treatment with film (FM-0.9) and low water treatment with film (FM-0.5, water surface evaporation coefficient is 0.5). The root distribution characteristics of Greenhouse Tomato under the influence of water stress and film mulching were systematically studied. The root water uptake was calculated by HYDRUS-1D. On this basis, the influence mechanism of different root water uptake on tomato yield and water use efficiency was compared, and the index of water value ratio was proposed to measure the effect of initial soil water on crop water demand.【Result】The results showed that the root length density of CK, FM-0.9 and FM-0.5 in the 0~20cm soil layer accounted for 58.5%, 56.3% and 78.7% of the total root length density. The root mean square error of soil moisture content of each soil layer simulated by HYDRUS-1D is about 0.010 cm3/cm3, and regression coefficient is about 0.864~1.076. The root mean square error of and transpiration and root water uptake are within 0.09 mm/d, and regression coefficient is more than 0.89, indicating that the simulated values are in good agreement with the measured values. From the root water uptake of different treatments, the largest root water uptake was FM-0.9 with the values of 240.9 mm, increased by 24.4% and 26.7% compared with CK and FM-0.5 treatment, respectively. The 0~40cm soil layer was main water uptake, and the root water uptake of CK, FM-0.9 and FM-0.5 treatments in this soil layer accounted for 84.2%, 85.7% and 83.2% of the total water uptake, respectively. The water use efficiency and irrigation water use efficiency of FM-0.5 were 59.0 and 70.3 kg/m3 respectively, which were 34.4% and 55.5% higher than CK, and 11.3% and 30.4% higher than FM-0.9, respectively. While the highest yield was the FM-0.9 with 147.7 t/hm2, which was 19.3% and 23.6% higher than CK and FM-0.5, respectively.【Conclusion】Therefore, according to the difference of tomato root response to water, the irrigation quota of 0.9 EP combined with film mulching cultivation technology can improve the absorption and utilization of deep soil water. |
| Key words: solar greenhouse; mulched drip irrigation; HYDRUS-1D; soil moisture; root length density; root water uptake |
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