Spatio-Temporal Variation and Influencing Factors of Reference Crop Evapotrans- piration at Different Time Scales in Altay Region

doi:10.3969/j.issn.1000?6362.2018.08.002

Abstract

Abstract: Based on the daily data of 7 meteorological stations in Altay region from 1961 to 2016， spatio-temporal change characteristics of ET0 and meteorological factors were analyzed with climate change rate and inverse distance weighted interpolation method after calculation with the Penman-Monteith model. Then the multiple regression analysis method were combined with the correlation coefficient to study the causes of change of different time scales of ET0. The results showed that the average annual ET0 of Altay Region was 928.46mm, the climate change rate of annual ET0 was -10.90mm·10y-1(P＜0.01). The seasonal average ET0 from high to low was summer, spring, autumn and winter, summer ET0 and autumn ET0 showed a significant decrease trend(P＜0.01), and winter ET0 showed a significant increase(P＜0.05). The maximum monthly average ET0 appeared at June and July, the minimum value appeared at January and December, and annual distribution presented parabolic shape. Overall, the spatial distribution characteristics of ET0 in difference time scales were basically consistent, and showed a significant decrease in ET0 in the middle and west region, and the decrease in annual ET0 was caused by the decrease of ET0 in summer. The main contribution factor of different time scales of ET0 change was different, but the significant decrease of average wind speed had the greatest effect on ET0 reduction.

Key words: Reference crop evapotranspiration, Spatio-temporal variation, Contribution rate, Climate change, Altay region

KANG Li-juan, Batur Bake, LUO Na-na, XUE Ya-rong, WANG Meng-hui. Spatio-Temporal Variation and Influencing Factors of Reference Crop Evapotrans- piration at Different Time Scales in Altay Region[J]. Chinese Journal of Agrometeorology, 2018, 39(08): 502-511.

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