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| DOI：10.13522/j.cnki.ggps.2021228 |
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| Changes in Transpiration and Evapotranspiration of Grapevines (Vitis vinifera L.) in Arid Oasis in Northwestern China |
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WANG Shangtao, ZHAO Nan, ZHANG Yang, et al
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1. School of Water Resources and Electric Power, Qinghai University, Xining 810016, China;
2. Key Laboratory of Western China’s Environmental Systems with the Ministry of Education,
College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;
3. Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
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| Abstract: |
| 【Objective】The ratio of transpiration (T) to evapotranspiration (ET) varies with plants and their growth stages. The aim of this paper is to experimentally study T and ET, as well as their temporal variations.【Method】The experiment was conducted at a grapevine vineyard in an arid oasis in northwestern China. The transpiration and evapotranspiration of the grapevines (Vitis vinifera L.) were measured using sap-flow sensor, microclimatic station and eddy-covariance methods, respectively, at different growth stages.【Result】During the whole growth season, the transpiration increased from the initial 0.20 mm/d to 8.13 mm/d at the middle of growth season; it then dropped gradually to 3.32 mm/d when the leaves started falling. In comparison, the associated evapotranspiration increased from initial 0.44 mm/d to 9.97 mm/d before gradually decreasing to 4.91 mm/d. The average T/ET ratio was approximately 63.5%.【Conclusion】Transpiration is the dominant soil water loss during the growth season of the grapevines (Vitis vinifera L.) in arid oasis in northwestern China. |
| Key words: arid oasis area; Vitis vinifera L.; sap flow; eddy covariance; transpiration-evapotranspiration ratio |
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