Untersuchungen zur Divergenz zwischen den Langzeittrends der realenVerdunstung von Schwarzbrache, Gras- und Kleeansaaten und derpotenziellen Verdunstung im mitteldeutschen Raum als ein Beitrag zur Klimadiagnose

摘要

In the present work; the actual evaporation and the potential evaporation according to the model of J. & G. Muller were analysed over a period of 48 years (from 1962 to 2009). These investigations are based on grass and clover. The final results were added up to 3 months. The trend shows an increasing divergence in each 2nd quarter during the period from 1962 to 2009. This information gives evidence for the increasing drought: and limited accumulation of grass and clover biomass between April and Rine. Ploughed land was also incorporated in the simulation to improve the spectrum of the soil layers. 'The investigations are, based on measurements of the weather stations Cent-Leumnitz and Chemnitz. The measurements include air temperature, precipitation amount and sunshine duration over flood-plain clay and loess from 1961 to 2009. The results were compared with results of the weather station Halle-Krollwitz. In Halle-Krollwitz there was no decrease in the direction of evaporation for ploughed land. In addition to this, there was no decrease in the direction of evapotranspiration of grass and clover over a period of 48 years. Finally, there was an interesting result: According to the amount. the actual evapo transpiration of grass on loess was similar to the evapotranspiration of clover on flood-plain clay.