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为了测定水分应力对果园的水分吸收模型和作物实际蒸腾蒸发量(AET)的影响,本项研究对五年树龄的桃树进行两种喷灌处理(分别为按计算的最大腾发量(MET)的50％和100％进行灌溉)。AET的估算是采用一种根据排出的水量和土壤剖面平均含水量之间关系而产生的简化水量平衡法。测量仪器选用中子仪。灌水充足时,桃树吸收的绝大部分水量来自于地表0～60cm厚的土层。如果土壤含水量减少,则吸收的水分趋向来自于深层土壤,这是因为深层土壤水分上升到表层,或是由于增加了深层根系吸水量。两种处理比较,其中50％MET处理的AET值从7月到9月是减小的,这在某种程度上是因为气孔关闭的缘故。50％MET处理从6月到9月不见出现排水,而100％MET处理大约有1mm/天的排水,并延续到8月底,直到9月份土壤干旱时才停止。
In order to determine the effect of water stress on the moisture absorption model and the actual transpiration (AET) of orchards, we conducted two sprinkling treatments on five-year-old peach trees (calculated maximum evapotranspiration (MET) 50% and 100% for irrigation). AET estimates use a simplified water balance based on the relationship between the amount of water discharged and the average water content of the soil profile. Measuring instruments used neutron analyzer. When sufficient irrigation, the vast majority of peach tree water absorption from the surface 0 ~ 60cm thick soil. If the soil moisture content decreases, the absorbed moisture tends to come from the deeper soil due to deep soil moisture rising to the surface or due to increased deep root water uptake. Compared to the two treatments, 50% of the MET treated AET values decreased from July to September, partly due to stomatal closure. 50% MET treatment saw no drainage from June to September, while 100% MET treated about 1 mm / day drainage and continued until the end of August until the soil was droughted in September.