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Universität Potsdam (2007)

Modellierung von Vegetationsentwicklung und Erosion entlang eines Klimagradienten von mediterran bis semiarid

Mathaj, Martin

Titre : Modellierung von Vegetationsentwicklung und Erosion entlang eines Klimagradienten von mediterran bis semiarid

Modeling of vegetation growth and erosion along a climate gradient from Mediterranean to semiarid

Auteur : Mathaj, Martin

Université de soutenance : Universität Potsdam

Grade : Diplom-Biologe Angefertigt 2007

Résumé
his study investigates by a grid based model in the Mediterranean sites along a climate gradient from arid to mesic Mediterranean the effects of climate, exposition, gradient as well as disturbances by fire and grazing/browsing to the vegetation and erosion development. The vegetation algorithms are basing on Köchy (2006) and Malkinson and Jeltsch (2007). The surface processes like runoff and soil transport will be determined by physical and empirical models from Manning, Shields, Strickler and van Rijn. Furthermore the universal soil loss equation - USLE - (Wischmeier and Smith, 1978) was used to compare the different approaches with each other. The model was able to indicate the Vegetation and erosion development in the Mediterranean well. Thereby the infiltration rate and the water availability were the most important parameter for the vegetation development. However the erosion was mainly influenced by heavy precipitation events. Disturbances by grazing/browsing were negative for the vegetation cover and increase the erosion. The comparison of the erosion calculated by the USLE clarify at mean similar erosion rates, but the USLE was not able to demonstrate the intra annual variability. The approach to calculate the erosion by physical and empirical models display a good prediction especially in variable environments

Mots-clés : Beweidung ; Hangneigung ; Korngröße ; Erosion ; grazing ; slope ; grain size ; Life sciences

Présentation

Version intégrale (pdf 6,12 MB)

Page publiée le 24 mai 2011, mise à jour le 1er décembre 2018