Projects per year
Key differences in the rates of flux of nutrients were identified, dependent on catchment characteristics. Full N speciation and P fractionation, together with dissolved organic carbon (DOC) enabled identification of the most likely contributing sources in each catchment. Nitrate (NO3-N) was the dominant N fraction in the chalk whereas organic and particulate N comprised the majority of the load in the clay/mudstone catchments. Despite current legislation, orthophosphate (PO4-P) was not found to be the dominant form of P in any of the catchments monitored. The chalk sub-catchments had the largest proportion of inorganic/dissolved organic P (DOP), accompanied by episodic delivery of particulate P (PP). Contrastingly, the clay/mudstone sub-catchments loads were dominated by PP and DOP. Thus, our results show that by monitoring both the inorganic and organic fractions a more complete picture of catchment nutrient fluxes can be determined, and sources of pollution pin-pointed. Ultimately, policy and management to bring nutrient impacts under control will only be successful if a multi-stressor approach is adopted.
- Headwater Catchments
- Catchment Characteristics
- Mitigation Measures
1/04/15 → 31/03/19
DOMAINE: Characterisation of the nature, origins and ecological significance of dissolved organic matter in freshwater ecosystems
Johnes , P. J., Evershed, R. P., Jones, D., Maberly, S., Jickells, T., Yates, C. A., Lloyd, C. E. M., Glanville, H., Mackay, E., Harrison, R. V., Bayliss, C. E., Pemberton, J., Reay, M. K. M., Brailsford, F., Mcintyre, C. A., Owen, A. T., Hopes, M., Evans, C., Fenner, N., Golyshin, P., Ferrer, M., Marshall, M. & Cooper, D.
1/04/14 → 31/12/19