Thomas Fuss

IGB Berlin Müggelseedamm 310 Berlin 12587 DE

fuss@igb-berlin.de Gabriel Andreas Singer

IGB Berlin Müggelseedamm 310 Berlin 12587 DE

gabriel.singer@igb-berlin.de 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.

 

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