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Gewählte Doctoral Thesis:

Liu Dong (2016): Diversity meets function — microbial response to a changing environment.
Doctoral Thesis - Institut für Bodenforschung (IBF), BOKU-Universität für Bodenkultur, pp 108. UB BOKU obvsg

Data Source: ZID Abstracts

Abstract:: Saprotrophic microbial communities play a major role in the litter decomposition process. The structure of these communities varies over the course of decomposition and is linked to changes in the chemistry of litter resources. The change of litter elemental concentrations (nutrients and stoichiometry), C-biochemical compounds (C-biochemistry), and litter inhabiting microbial community structure and abundance exhibited differential patterns during the course of decomposition. While litter stoichiometry in terms of C:N ratio tended to decline and become similar among litters with initial wide C:N ratios (convergence), C-biochemistry and microbial community structure tended to diverge. To further investigate microbial structure and function as affected by climate change such as the alteration of soil surface temperature and precipitation regimes a metaproteomic approach was applied on soil samples from climate change manipulation experiments under field conditions. These included eight years warming at 4°C above the ambient temperature and two treatments of moderate- and severe drought and rewetting. Overall, copiotrophic microbial taxa were more adaptive and abundant under drought-rewetting stress and generally utilized more easily-available C to produce energy. Soil warming induced a decrease in the abundance for most microbial taxa and functional assignments as well as depletions in the abundance of hydrophilic functional groups in SOM. In the biogeochemical cycles of SOM, sorption behavior and interaction between sorbent surfaces and proteins (enzymes) play an important role. Finally, we addressed biochar-amended soil by simplified evaluation through quantifying its effects on the sorption of a model protein in soil. Our results indicate that biochar application reduces protein sorption in soil. We conclude that there are numerous important interactions between soil proteins and biochemical soil properties, whereupon climate factors play an essential role.; Betreuer: Zechmeister-Boltenstern Sophie; 1. Berater: Keiblinger Katharina; 2. Berater: