Impacts of Land Use, Fertilizer and Manure Application on the Stream Nutrient Loadings in the Salmon River Watershed, South-Central British Columbia, Canada
- 1 Water & Aquatic Sciences Research Program, Department of Biology, University of Victoria, 3800 Finnerty Road, Victoria, BC, Canada
- 2 Kamloops Range Research Station, Agriculture and Agri-Food Canada, 3015 Ord Road, Kamloops, BC, Canada
- 3 Water & Aquatic Sciences Research Program, Department of Biology, University of Victoria, 3800 Finnerty Road, Victoria, BC, Canada
Abstract
Manure and fertilizer applications can increase soil productivity and land economic values, but the controversial result can be a decline of water quality due to the increased nutrient exports from soils to the streams. The impacts of landuse, manure and fertilizer application on nutrient exports from soils to the streams were analyzed using the SWAT (Soil Water Assessment Tool) model for the Salmon River watershed in south-central British Columbia, Canada. The results showed that the animal farms had the highest rates of nutrient exports from soils to the streams and the natural forested lands had the lowest. It was estimated that the whole Salmon River watershed would export approximately 11.52 t·yr -1 of organic nitrogen (ON), 8.05 t·yr -1 of nitrate nitrogen (NO 3 -N), 2.30 t·yr -1 of organic phosphorus (OP) and 1.36 t·yr -1 of soluble reactive phosphorus (SRP) if the whole watershed was covered by natural vegetation without human disturbance. Current landuse changes, by converting natural vegetation lands to agriculture and animal farms and associated manure and fertilizer applications, have in-creased approximately 53.30 t·yr -1 of ON, 9.68 t·yr -1 of NO 3 -N, 22.69 t·y -1 of OP and 6.23 t·y -1 of SRP exports to the streams in the whole watershed. The SWAT model predicted that a daily 100 kg·ha -1 of fresh manure deposit from grazing cows during grazing season from later spring to later fall could increase 2.57 kg·ha -1 ·yr -1 of ON, 0.39 kg·ha -1 ·yr -1 of NO 3 -N, 2.35 kg·ha -1 ·yr -1 of OP and 0.48 kg·ha -1 ·yr -1 of SRP export to the streams. Fertilization could increase 1.57 kg ha -1 yr -1 of ON and 4.02 kg·ha -1 ·yr -1 of NO 3 -N export to the streams if 100 kg·ha -1 ·yr -1 of nitrogen (NH 4 NO 3 ) fertilizer was applied in spring. Also fertilization could increase 1.18 kg·ha -1 ·yr -1 of OP and 0.20 kg·ha -1 ·yr -1 of SRP export to the streams if 100 kg·ha -1 phosphorus (P 2 O 5 ) fertilizer was applied in spring.
- K. C. Abbaspour, J. Yang, I. Maximov, K. B. Siber, J. Mieleitner, J. Zobrist and R. Srinivasan, “Modelling Hydrology and Water Quality in the Pre-Alpine/Alpine Thur Watershed Using SWAT,” Journal of Hydrology, Vol. 333, No. 2-4, 2007, pp. 413-430. doi:10.1016/j.jhydrol.2006.09.014
- E. W. Boyer, C. L. Goodale, N. A. Jaworski and R. W. Howarth, “Anthropogenic Nitrogen Sources and Relationships to Riverine Nitrogen Export in Northeastern USA,” Biogeochemistry, Vol. 57-58, No. 1, 2002, pp. 137-169. doi:10.1023/A:1015709302073
- J. E. Schoonover and B. G. Lockaby, “Land Cover Impacts on Stream Nutrients and Fecal Coliform in the Lower Piedmont of West Georgia,” Journal of Hydrology, Vol. 331, No. 3-4, 2006, pp. 371-382. doi:10.1016/j.jhydrol.2006.05.031
- V. Smil, “Nitrogen in Crop Production: An Account of Global Flows,” Global Biogeochemical Cycles, Vol. 13, No. 2, 1999, pp. 647-662. doi:10.1029/1999GB900015
- S. R. Carpenter, N. F. Caraco, D. L. Correll, R. W. Howarth, A. N. Sharpley and V. H. Smith, “Nonpoint Pollution of Surface Waters with P and Nitrogen,” Ecological Applications, Vol. 8, No. 3, 1998, pp. 559-568. doi:10.1890/1051-0761(1998)008[0559:NPOSWW]2.0.CO;2
- R. W. Howarth, G. Billen, D. Swaeny, A. Townsend, N. Jaworski, K. Lajtha, J. A. Downing, R. Elmgern, N. Caraco, T. Jordan, F. Berendse, J. Freney, V. Kudeyarov, P. Murdoch and Z. Zaho-Lina, “Regional Nitrogen Budgets and Riverine N & P Fluxes for the Drainages to the North Atlantic Ocean: Nature and Human Influences,” Biogeochemistry, Vol. 35, No. 1, 1996, pp. 75-139. doi:10.1007/BF02179825
- Z. Zhu, K, Broersma and A. Mazumder, “Model Assessment of Cattle and Climate Change Impacts on Stream Fecal Coliform Pollution in the Salmon River Watershed, British Columbia, Canada,” Water, Air, & Soil Pollution, Vol. 215, No. 1-4, 2011, pp. 155-176. doi:10.1007/s11270-010-0467-0
- L. Fewtrell, “Drinking-Water Nitrate, Methemoglobinemia, and Global Burden of Disease: A Discussion,” Environmental Health Perspectives, Vol. 112, No. 9, 2004, pp. 1371-1374.
- D. W. Schindler, “The Cumulative Effects of Climate Warming and Other Human Stresses on Canadian Fresh- waters in the New Millennium,” Canadian Journal of Fisheries and Aquatic Sciences, Vol. 58, No. 1, 2001, pp. 18-29. doi:10.1139/f00-179
- U. Larsson, R. Elmgren and F. Wulff, “Eutro-Phication and the Baltic Sea: Causes and Consequences,” Ambio, Vol. 14, No. 1, 1985, pp. 9-14.
- J. Meidinger and J. Pojar, “Ecosystems of British Columbia, Special Report Series 6,” BC Ministry of Forests PO BOX 9049 STN, Victoria, BC, Canada V8W 9E2, 1991.