Characteristics of apple SAP flow and its response to environmental factors in Ansai mountain area of northern Shaanxi Province
In order to reveal the transpiration and water consumption of mountain apple trees in different growth stages and their response to environmental factors,and provide scientific basis for the efficient use of agricultural water resources and the sustainable development of mountain apple industry in the loess region of northern Shaanxi.The thermal diffusion probe method(TDP)and automatic weather station were used to moni-tor the flow rate and environmental factors of mountain apple in the loess region of northern Shaanxi Province,and to analyze the change of mountain apple flow rate and its relationship with environmental factors such as solar radiation,temperature and atmospheric relative humidity.The results showed that the diurnal variation of SAP flow rate of mountain apple at different growth stages showed an Omega-shaped curve,with obvious diurnal variation and weak flow at night.The daily SAP accumulation of mountain apple at different growth stages demonstrated as fruit expan-sion stage(14.396 kg·d-1)>young fruit stage(14.10 kg·d-1)>fruit maturity stage(9.682 kg·d-1)>flowering stage(6.49 kg·d-1)>coloring stage(4.104 kg·d-1).The SAP flow rate of mountain apple in sunny days was higher than that in cloudy and rainy days.The multiple regression model of SAP flow rate and environmental factors of mountain apple was constructed,and all equations reached a significant level.The determination coefficient R2 of each growth period equation was higher than 0.81,which was well fitted.The transpiration water consumption in summer fruit expansion period is the largest in the loess region of northern Shaanxi,so water replenishment irrigation should be carried out before sunset or after sunrise.
mountain appleSAP flow rateenvironmental factorsAnsai mountain area of northern Shaanxi
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