- Programme area:3) Dimensions of Complexity of Aquatic Systems
Spatial variability of radon production rates in an alluvial aquifer affects travel time estimates of groundwater originating from a losing stream
Radon in surface water is mostly used to localise and quantify groundwater discharge. The study presents the opposite approach and use radon to estimate travel times of infiltrated surface water in the aquifer. The spatial heterogeneity of radon production rates complicates this approach, but the problems can be overcome by additionally considering temperature and hydraulic heads.
Wood ash as an additive in biomass pyrolysis: effects on biochar yield, properties, and agricultural performance
Simultaneous attenuation of trace organics and change in organic matter composition in the hyporheic zone of urban streams
Wastewater still contains high amounts of trace organic compounds and organic matter after the wastewater treatment plant. These compounds are usually discharged to rivers with the treated water. The study shows that in the hyporheic zone of the river, i.e. the river sediment, degradation of trace organic compounds takes place simultaneously with a change in the composition of organic matter.
Geochemical signatures of lignite mining products in sediments downstream a fluvial-lacustrine system
The authors have investigated whether and to what extent mining products from the Lusatian mining are deposited in the sediments of the River Spree: their signature in the river bed reaches 90 kilometres.
Geochemical focusing and sequestration of manganese during eutrophication of Lake Stechlin (NE Germany)
Eutrophication of Lake Stechlin leads to changes in the sediment by an intensification of internal matter cycles. The reductive dissolution of Mn in shallow areas and the precipitation result in the fixation of Mn as rhodochrosite in the sediment below 56 m depth. Geochemical Mn focusing indicates oxygen-free conditions in deep water and can be used to reconstruct former environmental conditions.
Long-term warming destabilizes aquatic ecosystems through weakening biodiversity-mediated causal networks
Climate change destabilizes aquatic ecosystems through weakening the interactions between species richness and biomass of phytoplankton and the chemical and physical environmental factors. This is the conclusion of a study on long-term data series of 10 aquatic ecosystems using the convergent cross mapping (CCM) method.