Spatio-temporal Distribution of Reference Crop Evapotranspiration and Its Analysis in Dali River Basin
HAN Lu
LI Peng
REN Zongping
GONG Junfu
Abstract：Using the Penman-Monteith formula, we calculated the reference crop evapotranspiration ET0 and its spatio-temporal variation from 1963 to 2012 based on the date measured from three meteorological stations in Da-li River Basin. We then analyzed the change and mutation of ET0 using the Mann-Kendall method, and found the meteorological factors that affect the change in ET0 based on the Pearson correlation coefficient. The results re-vealed that the ET0 increased slightly from 1963 to 2012 and the mutation occurred in 1970, 1975 and 1993. The climate in this basin was warm and dry over the past 50 years, in which the distribution of ET0 was uneven. ET0 peaked at 173.8 mm in June. Spatially, ET0 decreased from northeast to southwest, and was positively correlated with the average temperature, average sunshine duration and average wind speed (α=0.01), while negatively cor-related with the average relative humidity.
Keywords：reference crop evapotranspirationmeteorological factorsPenman-Monteith formulaPeasron corre-lation coefficient
Publication Date：2017-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：7( 100-106 )