| Variation characteristics and influencing factors of evapotranspiration for reference crops in Gansu Province |
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| DOI：10.7606/j.issn.1000-7601.2016.01.02 |
| Key Words: reference crop evapotranspiration (ET0) Gansu Province variation characteristics influencing factors cloud model |
| Author Name | Affiliation | | YIN Chang-chen | Engineering College of Gansu Agricultural University, Lanzhou, Gansu 730070, China
Agricultural Technology Promotion Center of Dunhuang, Dunhuang, Gansu 736200, China | | QI Guang-ping | Engineering College of Gansu Agricultural University, Lanzhou, Gansu 730070, China | | KANG Yan-xia | Engineering College of Gansu Agricultural University, Lanzhou, Gansu 730070, China
College of Hydrology and Water Resources, Hohai University, Nanjing, Jiangsu 210098, China | | PAN Xiao-yan | Agricultural Technology Promotion Center of Dunhuang, Dunhuang, Gansu 736200, China |
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| Abstract: |
| In order to explore the characteristics and influencing factors of reference crop Evapotranspiration (ET0) and the ET0s of the 4 partition areas in Gansu Province were measured by FAO-Penman-Monteith (98) formula. The variation characteristics and meteorological factors of ET0 were analyzed based on the cloud model of uncertain conversion between qualitative concept and quantitative description. Meanwhile, the meteorological factors affecting ET0 changes in different regions were investigated by the method of path coefficient analysis. The results showed that during 1951—2013, the ET0 in the northwest region was greater than that in the southeast. The ET0 in Hexi region was always the highest in Gansu Province, which nevertheless showed a decreasing trend yearly. The ET0s in Longzhong and Longdong regions were decreased during 1951—1980 and it became increased during 1980—2013, reaching an overall stabilized status. Longnan region was shown to possess the minimum value in years and become stable without obvious changes. During 1951—2013, the distribution of ET0 in Hexi region was most discrete, and the heterogeneity was most stable. The distribution of ET0 in Longdong region was most uniform, and stability was relatively the best. Path analysis showed that various meteorological factors had affected ET0 changes and the main influence factors in different regions were not the same. The average temperature had directly affected the changes of ET0 in Hexi region and Longxi region. The average relative humidity and sunshine hours had directly affected the changes of ET0 in Longzhong region and Longdong region, respectively. The average wind speed had indirectly affected the changes of ET0 in Hexi region, Longzhong region and Longdong region, while the sunshine hours had indirectly affected the changes of ET0 in Longnan region. |
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