Evapotranspiration, Transpiration and Dewfall

摘要: Actual evapotranspiration is the most critical parameter in hydrological water balance models. The knowledge of atmospheric, plant and soil interactions drylands limited. Many evaporation models have been developed, but mainly for agricultural crops. best known single-source Penman-Montheith model (Monteith 1965). This assumes that canopies can be regarded as one uniform surface or big, single leaf. Most largely successfully used estimating from vegetation which not drought-stressed relatively uniform, such fields. However, arid semi-arid regions are characterized by patchy larger open spaces. In an environment, especially sandy areas where runoff no practical importance budget, it rainfall, dewfall, transpiration constitute relevant parameters. Dewfall may become input variable at least seasonally even more important than rainfall (Zangvil 1996). Negev sand dunes, dew has ecological implication activity distribution biological crusts lichens (Chap. 21, this volume). paper, we will apply compare some common approaches to compute actual field measurements north-western Desert Israel, introduce a specifically applicable environments. context, dewfall inferred reversal evaporative process.