1. Study of landuse effects on dissolved organic matter chemistry and ecosystem metabolism (primary production, respiration) in a diverse cultural landscape of Central Europe. Hypothesis: Landuse affects metabolism and DOM chemistry, metabolism and DOM interact reciprocally. Approach: Single snapshot of DOM chemistry and diurnal oxygen (24 hours minimum with 2 consecutive nights, later inverse metabolism modelling) at streams along a landuse gradient.

2. Investigation of effects of mixing variously composed dissolved organic matter (and nutrients) at natural confluences on DOM biodegradation. Main hypothesis: Mixing of chemically differentiated water has non-additive influence on biodegradation (i.e. biodegradation below confluence cannot be predicted from tributaries). Approach: Collect water from naturally merging streams just before confluence, mix in lab according to observed discharge ratio and run 14-day biodegradation assays. Study biodegradation rates and changes of DOM composition during biodegradation assay.

 

]]> Running water bodies 15.232 48.452 Waldaist 14.569 48.337 Feldaist 14.567 48.336 Melk 15.271 48.149 Thomas Fuss Gabriel Andreas Singer