JOURNAL OF NATURAL RESOURCES ›› 2015, Vol. 30 ›› Issue (2): 315-326.doi: 10.11849/zrzyxb.2015.02.014

• Resource Evaluation • Previous Articles     Next Articles

Temporal and Spatial Changes of Potential Evapotranspiration and Its Influencing Factors in China from 1957 to 2012

HUANG Hui-ping1,2, CAO Ming-ming1, SONG Jin-xi1, HAN Yu-ping2, CHEN Shan-shan1   

  1. 1. College of Urban Environmental Science, Northwest University, Xi'an, 710127, China;
    2. School of Resources and Environment, North China University ofWater Resources and Electric Power, Zhengzhou, 450045, China
  • Received:2014-02-26 Revised:2014-05-23 Online:2015-02-20 Published:2015-02-10
  • About author:10.11849/zrzyxb.2015.02.014

Abstract:

According to daily meteorological data of 608 weather stations in China from 1957 to 2012, the thesis analyzes the temporal and spatial changes and trends of the potential evapotranspiration (ET0) in China using Penman-Monteith formula. Based on ArcGIS, SPSS and principal component analysis, this paper discusses the distribution characteristics and influencing factors of ET0. The results show that in the 56 years the average annual ET0 is between 616 and 2128 mm with the average of 1104 mm, and the highest value is 3.45 times of the lowest. In the Hexi Corridor, South of the Five Ridges, Hainan Island and the coastal area of southern China, ET0 is comparatively larger; however, in the northeast region of Heilongjiang, Sichuan basin and the east region of the southwestern area, ET0 is smaller. The ET0 of ten hydrological regions indicates decline trend, and the rate of the Northwest Rivers region is -12.22 mm/10 a. The rate of Haihe, Liaohe, Huaihe, Yangtze region is -9.15, -9.11, -8.02, -5.44 mm/10 a respectively. In Huanghe, Southeast, Southwest, Songhua regions, the decline rate is comparatively smaller. The interannual fluctuation in Huanghe and Southwest Rivers region is sever. The peak and minimum value appears in different month in ten regions. The maximum appears in July in Northwest Rivers, Huanghe, Southeast Rivers, Yangtze and Zhujiang regions, in May in the Southwest, Liaohe, Songhua, Haihe regions, while in June in Huaihe regions. Among influencing factors of ET0, the first principal component is the thermodynamic factor, the second principal component is the moisture and radiation factor, the third component is constitute of the geographic and aerodynamic factors, and the elevation factor composes the fourth.

Key words: potential evapotranspiration, ArcGIS, principal component analysis

CLC Number: 

  • S161.4