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Articles by Tomohisa YANO
Total Records ( 2 ) for Tomohisa YANO
  Adel T. Zeggaf , Shinichi Takeuchi , Hossein Dehghanisanij , Hisao Anyoji and Tomohisa Yano
  A field experiment was conducted in 2005 at the experimental station of the Arid Land Research Center, Tottori University, Japan, for comparing latent heat fluxes from a maize (Zea mays L.) field, maize transpiration, and soil surface evaporation by two different methods. The Bowen ratio energy balance method (Method 1) was used to measure latent heat fluxes above the maize canopy as well as between the soil surface and the canopy at 0.5-h time intervals. Then, latent heat flux from maize transpiration was calculated by the difference between that of the maize field and soil surface. In Method 2, a weighing lysimeter and sap flow gauges were used to measure latent heat fluxes from the maize field and maize transpiration, respectively, at 0.5-h time intervals. Then, latent heat flux from the soil surface was calculated by the difference between that of the maize field and maize transpiration. The coefficient of determination between latent heat fluxes by the two methods was 0.72 from the maize field and 0.77 from the maize transpiration. However, results indicated a low correlation between the latent heat fluxes from the soil surface by the two methods (r2 = 0.36). On the average, the Bowen ratio energy balance method underestimated by 6% the latent heat flux measured by weighing lysimeter data and overestimated by 14% that obtained by sap flow data resulting in a 30% underestimation of the measured latent heat flux at the soil surface. At daily time intervals, results were improved with relative errors around 19 and 21% for the latent heat fluxes from the maize field and maize transpiration, respectively. Finally, this study showed that the use of Method 1 for partitioning evapotranspiration at maize field level is feasible. The use of this technique for irrigation management to improve water use efficiency at crop field level needs to be explored.
  Derya ONDER , Mehmet AYDIN , Suha BERBEROGLU , Sermet ONDER and Tomohisa YANO
  This study was carried out to determine the impacts of climate change on aridity and land cover in Turkey. Data for future (2070s) climate change, according to present conditions (1990s), were estimated from the prediction results of a regional climate model (RCM). The RCM, which was developed in Japan, is based on the MRI model. The potential impacts of climate change were estimated according to the A2 scenario of Special Report on Emissions Scenarios (SRES). Aridity index, the ratio of precipitation to potential evapotranspiration, was computed by using measured data for the present condition and estimated data by the RCM for the future years. Changes in aridity were evaluated by comparing the current and future index values. Aridity variables were interpolated to determine the spatial distribution by means of geostatistical methods. Land cover was modelled and mapped by using the present and future aridity index data. In the southern regions of Turkey, especially along Mediterranean coasts, projected precipitation for 2070s will be 29.6% less than the present. On the contrary, an increase (by 22.0%) in precipitation was projected along the coast of Black Sea. The model predicted that the temperature might increase by 2.8-5.5 °C in the different regions of the country. This increase in temperature could result in higher evaporative demand of the atmosphere in the future (on the average 18.4 and 22.2% in the Mediterranean and Black Sea coastal regions, respectively and 17.8% in the whole country). Thus, an increase in aridity was foreseen for the whole Turkey except the north-eastern part. A conversion of deciduous broadleaf forest to evergreen needle-leaf forest is predicted in the northern coastal areas when we compare the future land cover with the present situation. The mixed forest vegetation could spread in the interior parts of East Anatolia and the north-western part of the country in the future.
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