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| DOI：10.13522/j.cnki.ggps.2017.0038 |
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| Response of ET0 to Meteorological Factors and Related Parameters in Tumote Youqi |
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SU Tingting, BAI Yanying, WEI Zhanmin
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College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
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| 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 Mongolia. 【Result】 ①At the annual scale, the correlation of meteorological factors for ET0 was: net radiation＞sunshine 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 sensitive 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 substituted 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. |
| Key words: meteorological factors; correlation parameters; correlation; principal component analysis |
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