Knowledge of vegetation-atmosphere interactions has great importance in ecological research, and to recognize these effective interactions, the collection and interpretation of micrometeorological data are essential. | P. ATTAROD, M. AOKI, V. BAYRAMZADEH, M. T. AHMADI Research Article Turk J Agric For 35 (2011) 597-609 © TÜBİTAK doi: Micrometeorological observations above a Japanese red pine forest within the growing season Pedram ATTAROD1,*, Masatoshi AOKI2, Vilma BAYRAMZADEH3, Mohammad Taghi AHMADI1 1 Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran, Karaj, . Box 31585-4314 - IRAN 2 Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3–5–8, Saiwai-Cho, Fuchu-Shi, Tokyo, 183-8509 - JAPAN 3 Department of Soil Sciences, Karaj Branch, Islamic Azad University, Karaj - IRAN Received: Abstract: Knowledge of vegetation-atmosphere interactions has great importance in ecological research, and to recognize these effective interactions, the collection and interpretation of micrometeorological data are essential. The main goal of this study was to understand the trends of evapotranspiration (ET) and other micrometeorological parameters within the growing season above a Japanese red pine forest in Japan. To measure ET, the Bowen ratio-energy balance approach was employed. These measurements were used with the Penman-Monteith reference evapotranspiration (ET0) in order to create crop coefficients (Kc) by the ratio of ET:ET0. Mean daily ET on the dry and rainy days was found to be and mm day–1, respectively, which was statistically different. Kc values were inconsistent from day to day and ranged between and , and, in general, were less than unity (average: , standard error: ). Significant differences in Kc were found between rainy days (wet canopy) and dry days (dry canopy). No remarkable changes were observed between rainy and dry days in the average contribution of latent heat flux, ground heat flux, and sensible heat flux to the energy budget. The data indicated that the Penman-Monteith equation may be useful for estimating the ET from the red pine .
