| Application and calibration of sap flow gauge in spring wheat transpiration |
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| DOI：10.7606/j.issn.1000-7601.2012.06.13 |
| Key Words: stem flow gauge calibration spring wheat transpiration evapotranspiration |
| Author Name | Affiliation | | LI Ruijuan | College of Forestry, Northuest A&F Unitersity, Yangling, Shaanxi 712100, China | | LIU Wenzhao | College of Forestry, Northuest A&F Unitersity, Yangling, Shaanxi 712100, China
lnstitute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources,Yangling, Shaanxi 712100, China | | WANG Peizhen | lnstitute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources,Yangling, Shaanxi 712100, China |
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| Abstract: |
| This study aimed at evaluating the transpiration characteristics of potted spring wheat using a sap flow method designed by a heat balanee technique under three different water treatments(high 85%~75%, middle 65%~55% and low 45%~35%)calibrated using a weighing method. The results showed that:(1)the treatment with the perlite cover of 0.11 g/cm2 is better than the others. Under this condition, the spring wheat transpiration accounts for 83.04% of the total
evapotranspiration;(2)the single wheat sap flow rate was strongly correlated with the transpiration rate at the daily scale with the correlation coefficient of 0.92, and slope and intercept of 0.4463 and 8.3391, respective-ly. Similarly regressive results
were also obtained at the hourly seale. (3)Taking Oet.31st, 2012 as an example, the calibrated single plant transpiration rate
were 26.51g/d,17.13g/d and 12.71 g/d, respectively, under three water conditions ranked from high to low. Overall, this study indicates, while determining the transpiration of field erops, it was necessary to calibrate the transpiration rate by sap flow method. |
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