Climate Change Research ›› 2020, Vol. 16 ›› Issue (3): 306-315.doi: 10.12006/j.issn.1673-1719.2019.103

• Impacts of Climate Change • Previous Articles     Next Articles

Impact of temperature and precipitation on runoff change in the source region of Lancang River

Ke WANG1,2,3,Tao PU4,Xiao-Yi SHI5,Yan-Long KONG1,2,3()   

  1. 1 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    2 Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China
    3 University of Chinese Academy of Sciences, Beijing 100049, China
    4 State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
    5 College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
  • Received:2019-04-30 Revised:2019-06-30 Online:2020-05-30 Published:2020-06-15
  • Contact: Yan-Long KONG


Based on the methods of linear regression, M-K and Pearson correlation analysis, the characteristics of the runoff change in the source region of Lancang River during 1960-2010 and its main influencing factors of temperature and precipitation were analyzed. Results show that there is a significant increasing trend of temperature in the source region of Lancang River and the winter temperature rise does the largest contribution (38%) to the annual increasing of temperature. The annual precipitation does not change significantly although there is a remarkable increasing trend of spring precipitation. The annual runoff in the study area exhibits no significant trend. However, both winter and spring runoff increase significantly. Correlation analysis shows that precipitation is the main controlling factor for the annual runoff. Monthly runoff change is also dominated by precipitation during the period with plentiful rainfall from June to October. However, the temperature has an important influence on runoff change during early spring and winter, which is attributed to the increasing temperature causing the accelerated melting of ice and snow. The quantitative analysis indicates that temperature has a larger contribution rate to runoff change than that of precipitation within early spring and winter.

Key words: Source region of Lancang River, Runoff change, Temperature, Precipitation

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