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Seasonal effects of drought on the productivity and fodder quality of temperate grassland species

Hahn, Claudia. Seasonal effects of drought on the productivity and fodder quality of temperate grassland species. 2018, Doctoral Thesis, University of Basel, Faculty of Science.

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Official URL: http://edoc.unibas.ch/diss/DissB_13014

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Abstract

During a two-year field experiment we tested the effects of seasonal drought events on the growth rates, physiological activity and fodder quality of several perennial C3 grasses that are commonly used for agricultural production. All tested grasses were subject to at least ten weeks of rainfall exclusion, either in spring, summer or fall of the years 2014 and 2015. The resistance of growth rates varied between seasons. While growth losses were lowest due to drought in spring, losses during summer and fall drought were much higher. Due to strong compensational effects after the release from drought annual net primary productivity was hardly affected by drought in either season. Against our expectations, growth rates of reproductive developmental stages were less affected by drought than those of vegetative stages. Moreover, measurements of leaf water potential and stomatal conductance, as well as carbon discrimination, showed that generative spring growth was least affected by drought. Plants during reproductive stages, thus, may invest more in drought resistance than during vegetative growth. Forage quality patterns, including nitrogen content, crude ash, digestible organic matter and net energy for lactation, were less straightforward in their response to seasonal drought. While quality parameters were reduced under drought in general, the release from drought enhanced forage quality, but seasonal differences could not be perceived.
Advisors:Kahmen, Ansgar and Arend, Matthias
Faculties and Departments:03 Faculty of Medicine > Departement Biomedizin > Department of Biomedicine, University Hospital Basel > Prenatal Medicine (Hahn)
05 Faculty of Science
UniBasel Contributors:Kahmen, Ansgar and Arend, Matthias
Item Type:Thesis
Thesis Subtype:Doctoral Thesis
Thesis no:13014
Thesis status:Complete
Bibsysno:Link to catalogue
Number of Pages:1 Online-Ressource (131 Seiten)
Language:English
Identification Number:
Last Modified:30 Apr 2019 04:30
Deposited On:29 Apr 2019 10:07

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