On the relationship between transpiration and soil texture

The relationship between microscale transpiration E characteristics and soil texture is analyzed. Microscale means point (few hundred meters x few hundred meters) and local (few kilometers x few kilometers) scales. In the analysis, sand and clay is used as soil texture. The point scale transpiration E sub(p) is evaluated by a deterministic model, while the local scale transpiration E sub(l) is estimated by a statistical-deterministic model. The core of the models is a diagnostic energy balance submodel based on the Penman-Monteith concept. The characteristics are considered in terms of analyzing the change of E versus soil moisture content, relative frequency distribution of E(), and the aggregation algorithms for estimation of (). The analyses are performed for different atmospheric forcing conditions. According to the results, the E characteristics for sand and clay show great similarity. They differ from each other only quantitatively. These quantitative differencies are extensively discussed. The results obtained can be useful for estimating E for different soil textures.