University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Doctoral Thesis:
Eva Oburger
(2010):
Organic acid anion dynamics in soil and their role in phosphate solubilization.
Doctoral Thesis - Studienabteilung,
BOKU-Universität für Bodenkultur,
pp 141.
UB BOKU
obvsg
- Abstract:
- Organic acid anions (e.g. citrate, malate, oxalate, malonate, gluconate, etc) released by plant roots or soil microorganisms are known to perform many beneficial functions in soil including enhanced nutrient solubilization (mainly P and Fe), accelerated mineral weathering, metal detoxification (Al, Cd, Zn, Cu) as well as stimulation of microbial growth and turnover. The research work presented here focuses on two key soil processes, sorption and microbial breakdown, that determine the ecological effectiveness and residence time of these low molecular weight (LMW) organic compounds in soil, as well as on investigating the chemical mechanisms responsible for an organic acid-driven increase in phosphate solubility. Furthermore, the biochemical mechanisms of non-mycorrhizal soil microorganisms to increase soluble phosphorus and potential agricultural applications are discussed. Consideration of the influencing factors identified may help to further improve P use efficiency by crops through adapted rhizosphere management.
- Betreuer: Wenzel Walter