| Cite this article: | 杨宇娜,汪季,张成福,等.吉兰泰及周边地区蒸散发的时空变化规律[J].灌溉排水学报,0,():-. |
| yangyuna,Wang Ji,Zhang Chengfu,et al.吉兰泰及周边地区蒸散发的时空变化规律[J].灌溉排水学报,0,():-. |
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| Spatial and temporal variations of evapotranspiration in Jilantai and its surrounding areas |
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yangyuna1, Wang Ji2, Zhang Chengfu2, Lui jun2, Wang Yuqing2, Yang Liying1
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1.College of desert control science and engineering Inner Mongolia Agricultural University;2.College of desert control science and engineering Inner Mongolia Agricultural University
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| Abstract: |
| The accurate estimation of evapotranspiration (water consumption) plays an important role in the management and distribution of water resources and the protection of ecological environment in arid areas.Using MODIS data and SEBAL model, the daily evapotranspiration of vegetation growing season from May to October in 2017 in Jilantai was estimated, and the correlation between evapotranspiration and environmental factors was analyzed.The results showed that: (1) the overall trend of daily average evapotranspiration in the growing season showed a single-peak distribution trend, with the maximum in July (3.98 mm) and the minimum in October (1.11 mm); (2) in spatial distribution, the evapotranspiration in high-altitude areas was higher than that in low-altitude areas; and the evapotranspiration value in different land use types was lower than that in high-altitude areas. The time dynamics of evapotranspiration of different land use types are the same, showing growth period > early growth period > late growth period; (3) Normalized vegetation index, elevation and evapotranspiration are positively correlated, wind speed and surface temperature are negatively correlated with evapotranspiration. Temperature and wind speed have the greatest influence on Evapotranspiration in the early growth stage, while surface temperature and elevation have the greatest influence on Evapotranspiration in the later growth stage.The evapotranspiration estimated by SEBAL model is close to land surface evapotranspiration and P-M formula, which indicates that SEBAL model is reliable in estimating evapotranspiration in this area. |
| Key words: Arid area; Vegetation type; Evapotranspiration; SEBAL model; MODIS |
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