Modelstudie voor het Bunder- en Elslooërbos

Rikje van de Weerd & Leo Spoormakers

nutriënten, modellering,  stroombanen, kalktufbron, kalkmoeras

De belasting aan vermestende stoffen in het grondwater is een belangrijke bedreiging voor de natte natuur in het Zuid-Limburgse Bunder- en Elslooërbos. Is de teruggang van deze natuur met gericht beleid om te buigen? En op welke manier? Met een model zijn de belasting en de stroombanen van het grondwater in beeld gebracht en aan de hand van scenario’s zijn de toekomstige nitraatbelasting en -fluxen verkend. Dit geeft inzicht in de benodigde maatregelen en nader onderzoek.

Impact of eutrophic groundwater on seepage dependent nature.Model study for the Bunder and Elslooërbos.

Rikje van de Weerd & Leo Spoormakers

Nutrient modelling, groundwater, flow paths, petrifying tufa spring, spring forest

Can the decline of the valuable wetlands in the Bunder and Elslooërbos be reversed with targeted policy? And how? With high loads of nutrients in spring water, eutrophication is a major threat. The loads and paths of this water has been visualized with a model. Future concentrations
and f luxes in springs and the effect of additional measures have been explored using scenarios. The main N load is from agriculture in the catchment area. Loads have decreased f rom 1993 onwards due to manure policy. Spring concentrations in sub area 1 (average travelling time: 17 years) are decreasing only since 2002, after 9 years. Based on scenario calculations a further decrease of source concentrations is expected. However, to reach reference goals for petrifying springs timely rigorous measures in agriculture are needed together with infiltration measures. Atmospheric deposition has reached the critical values for habitats. However, N-loads in the high seepage f lux (average 26 mm/d) are a hundredfold. Despite they possibly only partly impact nature, this may form a serious threat for the wetlands, and more research is needed. This also applies to the rate of anaerobic peat or organic matter degradation as a result of seepage with nitrate and sulphate. This study illustrates that insight in the entire infiltration area is crucial for determining measures for sustainable protection of seepage dependent nature.

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