COMPARISON OF MODELED AND MEASURED CO2 EXCHANGES OVER WINTER WHEAT IN THE THRACE PART OF TURKEY

Terrestrial ecosystems have an important role on the global carbon budget. Approximately 24 % of global greenhouse gas emission is resulted from agriculture, forestry and other land use. Agriculture is an emission source and also a storage area for carbon within terrestrial ecosystems. Evaluation of CO2 fluxes over a selected area has become a significant issue for the studies on global carbon budget and climate change under consideration of CO2 effects as a greenhouse gas. Thus, the objective of this study was to measure, analyze, model and evaluate CO2 fluxes using a micrometeorological method called Eddy Covariance together with an agro-ecosystem model, namely the Agro-C over winter wheat crop, which is an important nutritional source for Turkey. To achieve this, variations in CO2 were determined on the experimental area of Ataturk Soil Water and Agricultural Meteorology Research Institute Directorate in the Kirklareli city (located in the Thrace part of Turkey (41 degrees 41'53 '' N, 27 degrees 12'37 '' E)) during one growing period of winter wheat (November 2012-July 2013). In this context, the net ecosystem exchange (NEE), gross primary production (GPP) and ecosystem respiration (Rea)) values of winter wheat were measured and analyzed by Eddy Covariance method and then compared with corresponding simulation results estimated by Agro-C model during the growing period of winter wheat. Subsequently, relative errors between modeled and measured NEE, GPP and Rec values were calculated as 17.54, 22.85 and 41.74%, respectively.