TAILIEUCHUNG - Sensitivity of soil evaporation and reference evapotranspiration to climatic variables in South Korea
The quantification of evapotranspiration and soil evaporation is crucial for agricultural water management. The FAO56 Penman–Monteith and E-DiGOR models were used to compute reference evapotranspiration (Eto) and bare soil evaporation, respectively, at 17 meteorological stations of South Korea, from 1980 to 2009. | Turkish Journal of Agriculture and Forestry Turk J Agric For (2015) 39: 652-662 © TÜBİTAK doi: Research Article Sensitivity of soil evaporation and reference evapotranspiration to climatic variables in South Korea 1, 1 1 2 3 Mehmet AYDIN *, Yeong-Sang JUNG , Jae E. YANG , Su-Jung KIM , Kyung-Dae KIM Department of Biological Environment, Kangwon National University, Chuncheon, South Korea 2 Department of Biological and Environmental Sciences, Dongguk University, Seoul, South Korea 3 Gangwon Agricultural Research and Extension Service, Chuncheon, South Korea 1 Received: Accepted/Published Online: Printed: Abstract: The quantification of evapotranspiration and soil evaporation is crucial for agricultural water management. The FAO56 Penman–Monteith and E-DiGOR models were used to compute reference evapotranspiration (Eto) and bare soil evaporation, respectively, at 17 meteorological stations of South Korea, from 1980 to 2009. The same soil parameters were assumed for all stations in order to compare actual soil evaporation (Ea) rates jointly dominated by atmospheric evaporative demand and soil water availability, as well as the size of rainfall events. The sensitivity of Penman–Monteith type equations to the major climatic variables was determined based on 1-year dataset. The long-term mean annual precipitation and Eto calculated at selected stations over the country were mm and mm, respectively. Precipitation showed noticeable interyear fluctuations, and the annual Eto increased gradually during the study period. A strong correlation between pan evaporation (Epan) and Eto was observed (R = , P < ), based on daily data of 30 years. Similarly, a significant correlation between Epan and potential soil evaporation (Ep) was existent (R = , P < ). The Ep rates were lower than the Eto rates (Ep = × Eto). The magnitude of Ea, as .
đang nạp các trang xem trước
