| This article has been：Browse 2061Times Download 3499Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.2017.0271 |
|
| Temporal and Spatial Distribution Characteristics of Reference Crop Evapotranspiration in Shandong Province |
|
TAN Xiucui, WANG Gang, DIAO Yanfang, DONG Jie
|
|
Shandong Agricultural University, Taian 271000, China
|
| Abstract: |
| 【Objective】 Analyze the temporal and spatial characteristics and influencing factors of ET0 in Shandong Province. 【Method】 Daily climatic data in 24 meteorological stations were used to calculate ET0 by FAO-56 Penman-Monteith equation. In addition, statistical analysis and inverse distance weighted interpolation of ArcGIS were applied to quantitative analysis and qualitative analysis of the spatial-temporal characteristics of ET0. 【Result】 Over 1961—2011, the average ET0 was 1 161 mm in Shandong province, which showed a decreasing trend and the distribution difference was mainly influenced by aerodynamic factors. Within the year, ET0 was concentrated, with the largest ET0 in May and June, accounting for 27% of the whole year. ET0 was significantly affected by temperature and humidity from May to September, yet sunshine hours and wind speed were the main influencing factors from October to April. In space, ET0 decreased from northwest to southeast. In northeast land, ET0 was mainly affected by temperature and sunshine time, while mainly affected by the humidity, wind speed along the southeast coast. In space, there was significantly negative correlation between ET0 and humidity. The average relative error of ET0 estimated by humidity was 2%. 【Conclusion】 By analyzing spatial characteristics of ET0, the main control factor was determined by the humidity. |
| Key words: reference crop evapotranspiration; Shandong Province; temporal and spatial distribution; correlation analysis; inverse distance weighted |
|
|
