Root functions as influenced by different water supply
FacultiesFakultät für Naturwissenschaften
LicenseStandard (Fassung vom 03.05.2003)
The present thesis covers three chapters, each focusing on a root function during different water supply. Firstly, soil oxygenation by Carex rostrata in flooded soil is studied. The study showed that this wetland species can increase significantly soil oxygen availability. The aeration effect, however, was largely influenced by general diffusion conditions with the latter being a function of soil water status. Secondly, fine root dynamics in mature Fagus sylvatica is studied during exceptional drought. Despite severe soil drying, an overall weak relationship between fine root formation and soil water status appeared and there was no significant relationship for fine root mortality. Thirdly, fine root dynamics of mature Fagus sylvatica and Picea abies are compared under mesic conditions. This study revealed large between-species differences with Fagus sylvatica acquiring soil borne resources with short lived fine roots. Unlike for Picea abies, fine root formation and mortality showed a seasonal pattern indicating accelerated fine root turnover during favourable seasons. It is suggested that patterns of fine root dynamics in temperate forests are largely endogenously controlled. The results thus showed that site conditions and species-inherent patterns must be considered in order to understand the relationship between the root functions studied and soil water status.
Subject HeadingsFichte [GND]
Turnover <Ökologie> [GND]
Soil aeration [LCSH]
Water supply [LCSH]