Abstract:To understand the effect of drip irrigation water temperature on soil infiltration characteristics and soil temperature, a set of constant temperature device was developed to control water temperature fluctuanting range being within ± 0.5 ℃. At 5 ℃, 20 ℃ and 35 ℃, drip irrigation infiltration experiments were carried out respectively in the laboratory, then soil water infiltration and soil temperature were analyzed at different water temperatures. The results show that in the same time period, with the increase of drip irrigation water temperature, the horizontal and vertical wetted front migration distances increase, and the vertical wetted front migration rate increases. The model of horizontal(vertical)migration distance of wetted front, the infiltration time and water temperature is established under the condition of drip irrigation water infiltration at different water temperatures, with their correlation coefficients R2 all greater than 0.99. The average soil water content of the wetted soil body is not related to the infiltration time, but it decreases with the increase of the infiltration water temperature. The diffusion rate of soil moisture increases with the increase of water temperature. The saturated hydraulic conductivity is an exponential function of water temperature, it increases with the increase of water temperature, but the increase is smaller and smaller. The higher the temperature is, the lower the ability of soil to absorb water is. The different irrigation water temperature changed the temperature distribution in the soil. The Nariation of soil temperature caused by water temperature gradually decreased with the increase of the distance from the dropper. The conclusion could provide theoretical reference for drip irrigation technology in field and greenhouse.
朱红艳,刘利华,费良军. 滴灌水温对土壤入渗和土壤温度的影响[J]. 排灌机械工程学报, 2019, 37(10): 902-908.
ZHU Hongyan,LIU Lihua,FEI Liangjun. Effects of drip irrigation water temperature on soil infiltration and soil temperature. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(10): 902-908.
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