地理学报(英文版)

Journal of Geographical Sciences ›› 2019, Vol. 29 ›› Issue (6): 922-934.doi: 10.1007/s11442-019-1637-7

• Special Issue: Water Resources in Beijing-Tianjin-Hebei Region • Previous Articles     Next Articles

Effects of different land use types on potential evapotranspiration in the Beijing-Tianjin-Hebei region, North China

Jingyan HAN1,2, Yong ZHAO2*(), Jianhua WANG2, Bing ZHANG3, Yongnan ZHU2, Shan JIANG2, Lizhen WANG2   

  1. 1. Institute of Hydrology and Water Resources, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China
    2. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
    3. Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin 300387, China
  • Received:2018-05-12 Accepted:2018-11-15 Online:2019-06-25 Published:2019-07-25
  • About author:

    Author: Han Jingyan (1984-), PhD, specialized in hydrology and water resource. E-mail: hanjy16@mails.tsinghua.edu.cn

  • Supported by:
    National Key Research and Development Program of China, No.2016YFC0401407;National Natural Science Foundation of China, No.51379216;National Science Foundation for Distinguished Young Scholars, No.51625904;International Science & Technology Cooperation Program of China, No.2016YFE0102400

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Abstract:

Potential evapotranspiration (ET0) is vital for hydrologic cycle and water resource assessments as well as crop water requirement and irrigation demand assessments. The Beijing-Tianjin-Hebei region (Jing-Jin-Ji)-an important, large, regional, economic community in China has experienced tremendous land use and land cover changes because of urbanisation and ecological restoration, affecting the hydrologic cycle and water resources of this region. Therefore, we analysed ET0 in this region using climate data from 22 meteorological stations for the period 1991-2015 to understand this effect. Our findings show that ET0 increased significantly at a rate of 7.40 mm per decade for the region. Based on the major land use type surrounding them, the meteorological stations were classified as urban, farmland, and natural stations using the 2015 land use dataset. The natural stations in the northern mountainous area showed a significant increase in ET0, whereas most urban and farmland stations in the plain area showed a decrease in ET0, with only a few of the stations showing an increase. Based on the different ET0 trends for different land use types, these stations can be ranked as follows: urban stations (trend value: -4.663 to -1.439) > natural stations (trend value: 2.58 to 3.373) > farmland stations (trend value: -2.927 to -0.248). Our results indicate that land use changes affect meteorological parameters, such as wind speed and sunshine duration, which then lead to changes in ET0. We noted that wind speed was the dominant parameter affecting ET0 at all the natural stations, and wind speed and sunshine duration were the dominant parameters affecting ET0 at most of the urban stations. However, the main controlling parameters affecting ET0 at the farmland stations varied. These results present a scope for understanding land use impact on ET0, which can then be applied to studies on sustainable land use planning and water resource management.

Key words: land use, potential evapotranspiration, meteorological parameters, water resource management, Jing-Jin-Ji region