期刊
HYDROBIOLOGIA
卷 848, 期 14, 页码 3273-3289出版社
SPRINGER
DOI: 10.1007/s10750-020-04256-4
关键词
Riparian wetlands; Buffer zones; Non-point source water pollution; Fertilisers; Eutrophication; Nutrient capture by plants
资金
- European Union under the ERA-NET Cofund WaterWorks2015 Call
- Innovation Fund Denmark (Denmark) under the ERA-NET Cofund WaterWorks2015 Call
- Federal Ministry of Food and Agriculture (Germany) under the ERA-NET Cofund WaterWorks2015 Call
- National Centre for Research and Development (Poland) under the ERA-NET Cofund WaterWorks2015 Call
- European Union from the European Regional Development Fund under the Operational Programme Innovative Economy, 2007-2013
The study found that harvesting vegetation within wetland buffer zones can increase nitrogen removal efficiency while potentially increasing the decomposability of biomass, facilitating the recycling of nutrients. Therefore, biomass should be removed after mowing to maintain high levels of nitrogen and phosphorus removal efficiency.
Fertiliser use in agriculture increases the non-point pollution of waters with nitrogen (N) and phosphorus (P). Wetland buffer zones (WBZs) are wetland ecosystems between agricultural lands and water bodies that protect surface waters from non-point source pollution. We assessed how vegetation harvesting within WBZs impacts their N and P removal efficiency, nutrient uptake by plants and their biomass quality. We surveyed vegetation of a spontaneously rewetted fen along a small river in Poland, and analysed plant biomass, its nutrient contents and nutrient-leaching potential and the water chemistry. Total N removal reached 34-92% and total P removal 17-63%. N removal was positively related to the initial N concentration, regardless of mowing status. We found a high N removal efficiency (92%) in the harvested site. Vegetation of mown sites differed from that of unmown sites by a higher water-leached carbon and P contents in the biomass. We found that vegetation harvesting may stimulate the overall N removal, but may increase potential biomass decomposability, which eases the recycling of plant-incorporated nutrients back to WBZ. Thus, mowing should always be followed by the removal of biomass. Neglecting already mown WBZs may temporarily lower their nutrient removal efficiency due to potentially faster decomposition of plant biomass.
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