Estimation of plant transpiration from meteorological data under conditions of sufficient soil moisture

摘要: Abstract The transpiration of forest growth during the growing season when sufficient soil moisture is available estimated on basis requirement water for cooling trees. Tree regarded as a cooler with coolant (evaporative latent heat). Trees are simultaneously warmed up by incident solar radiation and cooled down ambient air evaporation from leaf. These parallel, mutually competing processes described in their simplest form provide algorithm calculation cooling-water requirement. uses hourly values temperature global-radiation totals. Properties expressed terms two phenomenological constants — effective absorptivity thickness leaves. Both obtained calibration. applicability proposed was subjected to experimental verification course seasons 1985–1989 mountain watershed LIZ, situated National Park Sumava southern part Czech Republic. error determining evapotranspiration/transpiration about 5% precipitation over season.