| Cite this article: | 谢静,宋妮,陈智芳,等.冬小麦蒸散源区代表性分析[J].灌溉排水学报,0,():-. |
| XIE Jing,Song Ni,Chen Zhifang,et al.冬小麦蒸散源区代表性分析[J].灌溉排水学报,0,():-. |
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| Analysis on Representativeness of Evapotranspiration Source Area of Winter Wheat |
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XIE Jing, Song Ni, Chen Zhifang, WANG Jinglei
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Institute of farmland irrigation,Chinese Academy of Agricultural Sciences/ Key Open Laboratory of crop water demand and regulation
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| Abstract: |
| 【Objective】Using the eddy covariance observation systems, turbulent fluxes in the winter wheat growth stage was captured. The flux contribution area of farmland ecosystem in experimental area and its temporal dynamics was analyzed by Kljun and KM models.【Method】Fluxes of the winter wheat were observed with the closed-path eddy covariance system from October 2019 to June 2020 at XinXiang comprehensive experimental base. The analytic footprint model of Kljun, and KM method based on land use information were used to analyze the distribution and variation of flux sources.【Result】① The southwest wind is the prevailing wind of the whole growth stage, the northeast wind is the secondary wind direction; ② In different growth stages and under different atmospheric states, differences were found among source areas, the source area is much larger under stable conditions than under unstable conditions; The direction and length of source areas are affected by wind direction and wind speed; ③ There is a linear relationship between the source area calculated by Kljun and KM models, SKM=0.93SKl-1962.5, R2=0.96, the results of KM method were larger than that of Kljun model.【Conclusion】The source regions calculated by Kljun and KM models are different, wind direction and wind speed are the main factors affecting the source distribution, the field of winter wheat is the main source of flux contribution in the experimental area. |
| Key words: Eddy covariance system; Source area; Kljun model; KM method; |
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