| Cite this article: | 王蒙,刘春伟,邱让建,等.江苏省参考作物蒸散量的时空变化及影响因素分析[J].灌溉排水学报,0,():-. |
| wangmeng,liuchunwei,qiurangjian,et al.江苏省参考作物蒸散量的时空变化及影响因素分析[J].灌溉排水学报,0,():-. |
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| Temporal and Spatial Variations of Reference Crop Evapotranspiration and Its Influencing Factors in Jiangsu Province |
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wangmeng,liuchunwei,qiurangjian,et al
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1.School of Applied Meteorology, Nanjing University of Information Engineering;2.Jiangsu Meteorological Bureau
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| Abstract: |
| Abstract: This study calculated the daily evapotranspiration(ET0) by using the data of wind speed, temperature, relative humidity and sunshine hours from 1961 to 2018 of 60 locations in Jiangsu province. And using methods of climate trend rate, sensitivity analysis, Kriging space interpolation and contribution rate analysis, the present paper analyzed the temporal and spatial variation and the influencing factors of ET0 in Jiangsu. The results indicated that (1)the mean ETo was 976.8mm and the change of the whole area ET0 was -0.439mm/(10a) from 1961 to 2018 in Jiangsu province. 28 of the locations(47%), mainly located in Wuxi and Suzhou, showed an increasing trend in ET0. There was a significant increase in ET0 in 11 sites, among which the climate tendency rates in Wuxi, Taicang and JingJiang area were 18.58mm/10a、18.97mm/10a、29.65mm/10a, respectively. 32 of them(53%), mainly distributed in Lianyungang, Xuzhou,Suqian, presented a decreasing trend in ET0. The trend was significant(p<0.05) in 16 sites. As characteristic areas, Xinyi, Sihong and Guannan decreased by -19.22mm/10a、-23.07mm/10a、-23.15mm/10a, respectively. (3) ET0 is sensitive to average temperature, sunshine hours,wind speed and relative humidity. The correlation coefficients between average temperature, sunshine hours, wind speed and ET0 were 0.396(p<0.01）、0.580(p<0.01)、0.165, respectively. And ET0 is the most sensitive to relative humidity with a negative correlation coefficient of -0.516(p<0.01). The zonal distribution characteristics of ST and SWS are obvious in the spatial distribution of sensitivity coefficient.(4)The analysis of contribution rate indicated that wind speed and relative humidity had a great contribution to the change of ET0. 22 locations, evenly distributed in the north Jiangsu province, were mainly influenced by wind speed. Among them, the wind speed of Peixian, Siyang and Xinyi contributed greatly to the change of ET0 with values of -13.44%、-12.52%、-12.49%, respectively. And 38 sites, mainly located in the south areas, were mainly influenced by the relative humidity. As characteristic areas, Danyang, Jingjiang and Kunshan contributed greatly with values of 18.47%、18.57%、20.87%, respectively. In addition, the average temperature and sunshine hours in the whole region have no main effect on the change of ET0. |
| Key words: Key words: Reference crop evapotranspiration; sensitivity analysis; contribution rate analysis; Jiangsu Province |
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