Response of ET0 to Meteorological Factors and Related Parameters in Tumote Youqi

SU Tingting; BAI Yanying; WEI Zhanmin

doi:10.13522/j.cnki.ggps.2017.0038

Abstract：[Objective]Study the response of ET0 and meteorological factors to the related parameters.[Method]The correlation and principal components between reference evapotranspiration (ET0) and meteorological factors and related parameters were analyzed by using ENVI5.3 software in the Tumote Youqi, Baotou City, Inner Mon-golia.[Result]①At the annual scale, the correlation of meteorological factors for ET0 was:net radiation>sun-shine time>maximum temperature>relative humidity>minimum temperature>wind speed. On the month scale, ET0 was most sensitive to maximum temperature and sunshine time in July;In April ET0 was most sensi-tive to relative humidity;May was most sensitive to wind speed;net radiation and ET0 correlation was significant every month;ET0 has no significant correlation with minimum temperature. During the crop season, ET0 is mainly affected by net radiation, sunshine time, and maximum temperature.②The correlation between NDVI, vegetation coverage, surface temperature and ET0 were significant, and all of them were positively correlated, NDVI was the most significant.③Using the principal component analysis, the principal component variables Z1 and Z2 are sub-stituted for the original data(maximum temperature, minimum temperature, relative temperature, sunshine time, wind speed, NDVI, vegetation coverage, surface temperature, net radiation).[Conclusion]During the growing season, ET0 is mainly affected by net radiation, sunshine time and maximum temperature. In related parameters, the correlation with NDVI is the best.