| Experiments on variation of grape sap flow under drip irrigation in extremely arid areas |
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| DOI：10.7606/j.issn.1000-7601.2012.06.10 |
| Key Words: grape drip irrigation sap flow meteorological factors reference crop evapotranspiration |
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| Abstract: |
| To explore the variation law and affecting factors of grape sap flow under drip irrigation, the Flow4-DL was used under furrow irrigation and drip irrigation in extremely an arid areas. The variation of sap flow rates, meteoro logical factors and relationship between daily sap flow and reference crop evapotranspiration were studied. The results showed that diurnal variation of grape sap flow rates displayed single peak curves in sunny day, and multi peaked curves in cloudy day. With partial correlation analysis to each environmental factor and sap flow, it was obtained that the sap flow was highly significantly correlated with photosynthetie active radiation and wind speed, signifrcantly correlated with saturated vapor pressure, but not
significantly correlated with air temperature and air humidity. The sequence of correla-tion degree was: photosynthetic active radiation>wind speed>saturated vapor pressure>air humidity>air temper-ature. The multiple stepwise regression analysis showed that there is a strong linear relationship between sap
flow and photosynthetic ally active radiation, wind speed, saturated vapor pressure, and the regression equation achieved a highly significant level. lt showed significant linear correlation between daily sap flow and reference crop evapotranspiration un-der furrow irrigation and drip irrigation, and the correlation degree of furrow irrigation was higher than that of drip irriga-
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