Thinking beyond the Bioreactor Box: Incorporating Stream Ecology into Edge‐of‐Field Nitrate Management. Issue 3 (1st May 2016)

• Record Type: Journal Article
• Authors: Goeller, Brandon C.; Febria, Catherine M.; Harding, Jon S.; McIntosh, Angus R.
• Is Part Of: Journal of Environmental Quality. Volume 45:Issue 3(2016)
• Page Start: 866
• Page End: 872
• Publication Date: 2016-05-01
• Subjects: Agricultural ecology -- Periodicals; Environmental engineering -- Periodicals; Pollution -- Periodicals; 630
• DOI: 10.2134/jeq2015.06.0325
• Languages: English
• ISSNs: 0047-2425

Abstract

Abstract : Around the world, artificially drained agricultural lands are significant sources of reactive nitrogen to stream ecosystems, creating substantial stream health problems. One management strategy is the deployment of denitrification enhancement tools. Here, we evaluate the factors affecting the potential of denitrifying bioreactors to improve stream health and ecosystem services. The performance of bioreactors and the structure and functioning of stream biotic communities are linked by environmental parameters like dissolved oxygen and nitrate‐nitrogen concentrations, dissolved organic carbon availability, flow and temperature regimes, and fine sediment accumulations. However, evidence of bioreactors' ability to improve waterway health and ecosystem services is lacking. To improve the potential of bioreactors to enhance desirable stream ecosystem functioning, future assessments of field‐scale bioreactors should evaluate the influences of bioreactor performance on ecological indicators such as primary production, organic matter processing, stream metabolism, and invertebrate and fish assemblage structure and function. These stream health impact assessments should be conducted at ecologically relevant spatial and temporal scales. Bioreactors have great potential to make significant contributions to improving water quality, stream health, and ecosystem services if they are tailored to site‐specific conditions and implemented strategically with land‐based and stream‐based mitigation tools within watersheds. This will involve combining economic, logistical, and ecological information in their implementation. Core Ideas: Bioreactor location should complement farm‐ and watershed‐scale N management. Linked environmental parameters drive bioreactor performance and stream ecology. Evaluate potential stream health benefits from bioreactors on ecological time scales. Incorporate bioreactor ecological performance data into adaptive management plans.