Spatiotemporal Distribution Characteristics and Influencing Factors Analysis of Reference Evapotranspiration in Beijing–Tianjin–Hebei Region from 1990 to 2019 under Climate Change

Zihan Liu, Dong Jing, Yu Han, Jingxin Yu, Tiangang Lu and Lili Zhangzhong
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Zihan Liu: College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100091, China
Dong Jing: National Engineering Research Center for Information Technology in Agriculture, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
Yu Han: College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100091, China
Jingxin Yu: National Engineering Research Center for Intelligent Equipment in Agriculture, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
Tiangang Lu: Beijing Digital Agriculture and Rural Promotion Center, Beijing 100029, China
Lili Zhangzhong: National Engineering Research Center for Intelligent Equipment in Agriculture, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China

Sustainability, 2022, vol. 14, issue 10, 1-22

Abstract: Reference evapotranspiration (ET 0 ) is an important part of the water and energy cycles during crop growth. Understanding the influencing factors and spatiotemporal variations of ET 0 is of positive significance for guiding regional water-saving irrigation and regulating agricultural production. Data for daily meteorological observations of temperature, relative humidity, wind speed, and sunshine hours from 40 surface meteorological stations and the methods of climate tendency rate, Morlet wavelet, M-K mutation, path analysis, sensitivity analysis, and contribution rate analysis were utilized, to analyze the spatiotemporal distribution characteristics and influencing factors in the Beijing–Tianjin–Hebei region from 1990 to 2019. The ET 0 from 1990 to 2019 was 958.9 mm, and there was a significant downward trend in the climate tendency rate of −3.07 mm/10 a. The ET 0 presents a spatial distribution pattern decreasing from southwest to northeast. A change in the Beijing–Tianjin–Hebei region’s interannual ET 0 occurred in 2016, with a decrease of 41.12 mm since then. The ET 0 was positively correlated with temperature, wind speed, and sunshine hours, and negatively correlated with relative humidity; among those, wind speed and temperature are the dominant factors affecting the change of ET 0 . This study provides a scientific basis for the regulation and control of agricultural production in the Beijing–Tianjin–Hebei region.

Keywords: reference evapotranspiration; spatiotemporal distribution; influencing factors; Beijing–Tianjin–Hebei region; sensitivity analysis (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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