Sap Flow Characteristics of Kiwifruit and Its Response to Environmental Factors
[Objective]The influence of environmental factors on the sap flow characteristics of kiwifruit trees were studied to provide support for scientifically planning the irrigation of kiwifruit trees.[Method]Taking the 6-year-old kiwifruit trees in the 2023 growth season as the study object,the sap flow data were measured in 1 growth season by using thermal diffusion method.And combined with the meteorological and soil data,the relationship between environmental factors(temperature,precipitation,radiation,vapor pressure deficit,humidity and temperature of soil,etc.)and the sap flow of kiwifruit was analyzed.[Result]The average sap flow rate of kiwifruit tree ranged from 43.607 to 355.775 g/h,and the daily cumulative amount of kiwifruit sap flow showed as in July＞June＞August＞September＞May＞April.There were similarities among the sap flow characteristics of kiwifruit trees grown in different months,and showed the trend of low-high-low from 0:00 to 24:00.The rule of hourly sap flow rate of kiwifruit trees under different climate conditions was similar,while there were differences in the peak of sap flow rate in sunny day＞cloudy day＞rainy day.The sap flow rates in sunny day,cloudy day and rainy day were positively correlated with the net radiation(Rn),vapor pressure deficit(VPD)and temperature of soil at 20 cm(T),but were negatively correlated with the relative air humidity(H).The multiple regression equation of sap flow rate in sunny day,cloudy day and rainy day and 4 environmental factors was F=4 894.222+8.078e-5Rn+284.579VPD-256.581T+10.019H(R2=0.866),F=-5 220.102+3.410e-5Rn+288.798VPD+181.098T+9.861H(R2=0.855),F=-2 345.668+9.976e-6Rn-4.915VPD+103.162T-0.482H(R2=0.568),respectively.[Conclusion]The water consumption of kiwifruit varies in different months and under different weather conditions are different.The daily transpiration on sunny days in July and August are the largest,indicating that water can be stored appropriately and irrigation can be increased.
kiwifruitsap flow ratenet radiationvapor pressure deficittemperature of soilrelative air humidity
NETL
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万方数据
