The Change Law of Stem Flow Rate of Fuji Apple Tree Under Drip Irrigation

doi:10.11924/j.issn.1000-6850.casb18110059

Abstract

Abstract: The purpose is to understand the change law of stem flow rate of Fuji apple tree compactly planted with dwarfing rootstock, and to provide a theoretical basis for formulating a rational dry-farming water-saving irrigation system. The stem flow rate data were collected in real time by thermal dissipation probe method, combined with the meteorological factor data obtained from automatic weather station monitoring, the drip irrigation test with different lower irrigation limits was designed. The effects of meteorological factors on stem flow rate were studied. The lowest average value of stem flow rate was 2.07 mL/(cm2·h)], and the highest value appeared in June and July, it was 9.56 mL/(cm2 ·h)]. During the growth period, the stem flow rate showed obvious diurnal variation, which presented a single-peak curve in sunny day, a relatively gently change in wet day, and a multi-peak curve in cloudy day. The variation law of stem flow rate was significantly and positively correlated with solar radiation intensity, atmospheric temperature and soil temperature, and the correlation coefficient was 0.9746, 0.9389 and 0.9119, respectively; but it was a significantly negative correlation with atmospheric relative humidity, and the correlation coefficient was -0.7526. There was no significant correlation between stem flow rate and soil moisture, but the decrease of soil moisture content would reduce stem flow rate. The correlation between stem flow rate of Fuji apple and meteorological factors ranked from high to low as the solar radiation intensity＞atmospheric temperature＞soil temperature＞atmospheric relative humidity＞soil moisture. With stem flow rate as the dependent variable and each meteorological factor as the independent variable, the regression equation between stem flow rate, solar radiation intensity and atmospheric temperature was obtained through stepwise regression linear analysis: Y=- 8.81 + 0.013X1 + 0.52X2. The solar radiation intensity is the direct factor that affects stem flow rate (transpiration water consumptionin).

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