| Temporal and spatial scale transformation of evapotranspiration of jujube orchard under micro sprinkler irrigation in arid oasis |
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| DOI：10.7606/j.issn.1000-7601.2022.02.13 |
| Key Words: jujube orchard evapotranspiration soil evaporation stem flow eddy covariance spray irrigation |
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| Abstract: |
| The purpose of this study was to explore the transformation of single jujube tree evapotranspiration to jujube orchard evapotranspiration in different spatial and temporal scales in arid oasis area. In this experiment, the evapotranspiration of jujube orchard, jujube tree and soil evaporation were monitored by eddy covariance system, stem flow meter and micro lysimeter. Based on the analysis of evapotranspiration of jujube orchard measured by stem flow system and eddy covariance system in different time and space scales, the transformation relationship from point (jujube tree) scale evapotranspiration to surface (jujube orchard) scale evapotranspiration was revealed. The main conclusions are as follows: (1) The transpiration of the whole growth period was 403.2 mm, accounting for 75% of the total evapotranspiration. The order of the transpiration of each growth period was fruit maturity>fruit enlargement>flowering >leaf bud stage. (2) The linear regression equations of stem flow system and eddy covariance system for measuring evapotranspiration of jujube orchard under daily scale and irrigation cycle scale were Y=0.964X,R2=0.674,NSE=0.67,RSR=0.57;Y=0.965X,R2=0.832,NSE=0.78,RSR=0.47. (3) The total difference of evapotranspiration between stem flow system and eddy covariance system was 4.98 mm, accounting for 0.93%. In summary, the jujube evapotranspiration measured by stem flow system in different spatial and temporal scales had a good correlation with the jujube orchard evapotranspiration measured by eddy covariance system, and the single jujube tree evapotranspiration measured by stem flow system could be converted to the jujube orchard scale evapotranspiration. |
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