Spatial-temporal distribution characteristics of reference crop evapotranspiration and climate influence factors in Henan Province
HAN Yang1,2, CHANG Di1,2, HUANG Zhongdong1,3, LI Ping1,3, LIANG Zhijie1,3, QI Xuebin1,3*
1.Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, Henan 453003, China; 2.Graduate University of Chinese Academy of Agricultural Sciences, Beijing 100081, China; 3. Ministry of Agriculture Water Environment Factor Risk Assessment Laboratory of Agricultural Products Quality and Safety, Xinxiang, Henan 453003, China
Abstract：Based on the long-term observational data during 1951—2016 in 10 typical meteorological stations, Henan Province, the daily reference crop evapotranspiration(ET0)was calculated with the aid of the revised Penman-Monteith model recommended by FAO. The spatial-temporal distribution characteristics of ET0 and its major climate influence factors in 66 years in Henan Province were analysed by performing the Mann-Kendall test, Kriging spatial interpolation analysis in GIS and path analysis. The results indicate that the overall ET0 shows a yearly declining trend with the decreasing rate of around 1.37 mm/a, especially a significant decline trend is found in Anyang, Luoyang, Zhengzhou, Shangqiu, Xuchang, Baofeng, Xihua and Zhumadian. Additionally, the ET0 experiences a high-to-low mutation in the early 1980s, when the decrease is as large as approximate 62 mm. In recent 66 years, the annual ET0 was between 917 mm and 1 007 mm. In the central region, the ET0 was smaller. There is a significant difference in spatial distribution of ET0 before and after the mutation. The spatial distribution is distinct in four seasons, especially the distribution characteristics in spring and summer are close to the annual distribution. Effects of meteorological factors on ET0 from the most significant to the least significant are in the following sequence: wind speed, sunshine hours, average relative humidity and average temperature. Further, the wind speed, sunshine hour and average temperature are positively correlated to ET0, while the average relative humidity is negatively correlated to ET0. This study can provide a scientific basis for farmland water management in Henan Province.
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