温室滴灌条件下辣椒耗水特性的研究

针对现代化玻璃温室地表和地下滴灌方式,选择灌水周期和灌水定额为试验因素,开展了辣椒耗水特性试验研究。结果表明,温室条件下,地下滴灌较地表滴灌能节水5%~18%;为了减少辣椒耗水,地表滴灌方式宜缩短灌水周期,地下滴灌方式则宜适当延长灌水周期。温室滴灌条件下,辣椒耗水量组成中,棵间蒸发占主导,棵间蒸发量是日均蒸腾量的1.7~3.0倍,且辣椒日均耗水量可以用日均棵间蒸发量很好地线性表达,同时,辣椒棵间蒸发量也可以用温室内同期水面蒸发量进行线性预估。

Research on Water Consumption Characteristics of Pepper Under Drip Irrigation in Greenhouse

In view of the modern glass greenhouse surface and subsurface drip irrigation mode ,selecting the irrigating quota ,irriga‐tion cycle for the experimental factors ,the paper carried out an experiment research about water consumption characteristics of pep‐per .The results showed that :under the condition of greenhouse ,subsurface drip irrigation compared with the surface drip irrigation can save water 5% ~18% .To reduce water consumption of pepper ,surface drip irrigation cycle should be shortened and subsurface drip irrigation cycle should be prolonged appropriately .Under drip Irrigation in greenhouse ,in the composition of pepper water con‐sumption ,soil evaporation dominated ,and was 1 .7~3 .0 times of the average daily transpiration .Furthermore ,average daily water consumption of pepper could be well expressed linearly by average daily soil evaporation ,while average daily soil evaporation could be well predicted linearly by contemporaneous water surface evaporation .