The main aim of the project RIBUST (RIparian BUffer STrip) is to analyse the effectivity of grassed filter strips to retain nutrients (especially phosphorus) and which factors are contributing the most to nutrient retention and release processes. Other research questions are to which extent buffer strips are already saturated with phosphorus in Lower Austria and if they could switch from nutrient sinks to sources.



Project processing: D. Ramler, P. Strauss

Project promotion: Lower Austria state government, FTI Strategie Wasser

Brief description:

The project RIBUST is a collaboration with the WasserCluster Lunz, the BOKU, and the Karl Landsteiner private university. The main focus lies on the effectivity of riparian buffer strips to retain different substances, such as nutrients, sediment, or pathogens. To this end, we take samples on land in field and buffer strip soils, as well as water and sediment samples in brooks and streams.

Research questions that shall be answered at the IKT are, for instance, how factors like the physico-chemical soil parameters, the (sub-)surface runoff, and the retention of phosphorus are related, or which conditions lead to a release of retained phosphorus from buffer strip soils.

By comparing samples from field and buffer strip soils, both from inside and outside areas of (concentrated) runoff, we can determine the functional and spatial effectivity of nutrient retention. Additionally, we conduct artificial rainfall simulations to analyse the performance of buffer strips under different rainfall intensities and nutrient concentrations. Hereby, we measure the concentration of important phosphorus fractions in the surface runoff and interflow and relate them to soil characteristics. The results will also form the basis for a risk assessment of a potential degradation of water quality under different climate change scenarios.



published at 22.03.2021, IKT - Institut für Kulturtechnik und Bodenwasserhaushalt