• 论文 •

### 海南岛参考作物蒸散量时空变化特征及成因分析

1. 海南省气象科学研究所，海口 570203
• 收稿日期:2017-04-27 出版日期:2018-01-20 发布日期:2018-01-19
• 作者简介:邹海平（1987-），硕士生，工程师，研究方向为农业气象。E-mail：google2456@163.com
• 基金资助:
海南省自然科学基金项目（417300；20154172）；国家自然科学基金（41465005；41765007；41675113）

### Spatiotemporal Change Characteristics and Causes Analysis of Reference Crop Evapotranspiration in Hainan Island

ZOU Hai-ping, CHEN Hui-lin, TIAN Guang-hui, CHEN Xiao-min, BAI Rui, TONG Jin-he

1. Institute of Meteorological Science of Hainan Province, Haikou 570203, China
• Received:2017-04-27 Online:2018-01-20 Published:2018-01-19

Abstract: Based on the daily data of 18 meteorological stations in Hainan Island from 1971 to 2010, spatiotemporal change characteristics of ET0 of year and the four seasons were analyzed with linear regression and ArcGIS spatial interpolation techniques after calculation with the Penman-Monteith model. Then the sensitivity coefficients were combined with the relative changes of meteorological factors to study the causes of change of ET0 of year and the four seasons. The results showed that the average annual ET0 of 18 stations was 1191.4mm, and except for summer, ET0 of year and the other 3 seasons increased from the northeast to southwest approximately. The average climate change rate of annual ET0 of 18 stations was -5.0mm×10y-1 in recent 40 years, among which 13 stations’ climate change rates were negative and 5 stations’ were positive. The average climate change rate of four seasons’ ET0 were -3.1, 1.8, -0.7 and -2.8mm×10y-1, respectively. Overall, 13 stations’ annual ET0 decreased mainly due to the decrease of ET0 of spring, and the rest 5 stations’ increase was mainly due to the increase of ET0 of summer. The attribution analysis showed that mean wind speed’ decrease and sunshine hours’ reduction was by and large the main reason for the decrease of ET0 of year, spring, summer, and autumn in most areas of Hainan Island. Besides the reason above, the decrease of vapor pressure was also one of the major causes for the decrease of winter’s ET0. On the other hand, the major reason for the increase of annual and four seasons’ ET0 was the rise of the average maximum and minimum temperature.