• 研究报告 •

### 低丘红壤区稻田实际蒸散特征及其气象影响因素

1. (1气象灾害预报预警与评估协同创新中心， 南京 210044；2江苏省农业气象重点实验室， 南京 210044；3南京信息工程大学应用气象学院， 南京 210044)
• 出版日期:2018-01-10 发布日期:2018-01-10

### The characteristics of actual evapotranspiration and influencing factors of paddy field in low hilly red soil region.

LI Qian1,2, JING Yuan-shu1,2,3*, MA Mei-juan2,3, WANG Han2,3, LI Gen1,2

1. (1Collaborative Innovation Center of Meteorological Disaster Forecasting Warning and Assessment, Nanjing 210044, China; 2Key Laboratory of Agricultural Meteorology in Jiangsu, Nanjing 210044, China; 3College of Applied Meteorology, Nanjing University of Information Science &Technology, Nanjing 210044, China).
• Online:2018-01-10 Published:2018-01-10

Abstract: In this study, we used the data of field meteorological observation of late rice in low hilly red soil region and analyzed the distribution characteristics with typical diurnal and monthly variation of the actual evapotranspiration of rice field at different growth stages. At the same time, the influences of meteorological factors on the actual evapotranspiration were studied by using the path analysis method and Beven’s sensitivity formula. The results indicated that the actual value of evapotranspiration during the whole growth period was 290.61 mm and the measured evapotranspiration value was the largest at transplantingtillering stage, which was 96.91 mm, accounting for 33.3% of the whole growth period. The evapotranspiration of paddy field in the whole growth period showed a tendency to increase first and then decrease gradually. The peak appeared in the later stage of rice tillering. The change of rice field evapotranspiration in one day showed the low intensity in the morning and evening but high at the noon, which just liked a ‘reverse’ U. Weather conditions and the duration of growth period also had some influences on evapotranspiration. Path analysis and sensitivity analysis showed that net radiation and relative humidity had higher total contribution coefficient and sensitivity coefficient, which means these two factors were the main meteorological factors that affected the evapotranspiration of paddy field. The three temperature factors (the highest temperature, lowest temperature, average temperature) were in the next place, and the wind speed’s effects on evapotranspiration were little. There was a significant time scale difference for the relationship between evapotranspiration and meteorological factors. The effect of each meteorological factor on the actual evapotranspiration was more significant at daily scale than at hourly scale.