Share This Article:

Processes Governing the Retention of Phosphorus and Nitrogen in Nyashishi Wetland

Abstract Full-Text HTML Download Download as PDF (Size:1327KB) PP. 124-134
DOI: 10.4236/oje.2014.43014    3,506 Downloads   4,829 Views   Citations

ABSTRACT

One of the important functions of the wetland is the retention of catchment nutrients and improving lacustrine water quality. This study analyzed how much nutrients were retained in the Nyashishi wetland, southern part of Lake Victoria, and went further to analyze the processes which were responsible in the reduction of nutrients. Three major processes were analysed in this study, namely nutrients uptake by three macrophyte species (Eichhornia crassipes, Cyperus papyrus and Typha domingensis) dominating the Nyashishi wetland, nitrification and denitrification processes. The study demonstrated high nutrients retention especially phosphorus nutrients of which up to 98% were retained. In some occasions, particularly for nitrogen nutrients, there was 0% retention especially during wet season. In some other instances, the inflow exceeded the outflow meaning that, more nutrients were generated by the wetland itself. Among the three processes analyzed, nutrients uptaken by macrophytes were more efficient in reducing nutrients in wetland water. Biological nitrification and denitrification which are believed to be the major pathway for ammonia removal in both natural and constructed wetlands were less important in this study. Among the macrophyte species, Eichhornia crassipes demonstrated higher uptake rate than the other two species possibly due to its high turnover rate. This ability can be exploited in removing excess nutrients from runoff by frequent harvesting of the mature plants.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Sekadende, B. , Machiwa, J. and Mwanuzi, F. (2014) Processes Governing the Retention of Phosphorus and Nitrogen in Nyashishi Wetland. Open Journal of Ecology, 4, 124-134. doi: 10.4236/oje.2014.43014.

References

[1] Kelderman, P., Kansiime, F., Tola, M.A. and VanDam, A. (2007) The Role of Sediments for Phosphorus Retention in the Kirinya Wetland (Uganda). Wetlands Ecology and Management, 15, 481-488.
[2] Kansiime, F., Saunders, M.J. and Loiselle, S.A. (2007) Functioning and Dynamics of Wetland Vegetation of Lake Victoria: An Overview. Wetland Ecology Management, 15, 443-451. http://dx.doi.org/10.1007/s11273-007-9043-9
[3] Mugisha, P., Kansiime, F., Mucunguzi, P. and Kateyo, E. (2007) Wetland Vegetation and Nutrient Retention in Nakivubo and Kirinya Wetlands in the Lake Victoria Basin of Uganda. Physics and Chemistry of the Earth, Parts A/B/C, 32, 1359-1365. http://dx.doi.org/10.1016/j.pce.2007.07.040
[4] Zimmo, O. (2003) Nitrogen Transformations and Removal Mechanisms in Algal and Duckweed Waste Stabilisation Ponds Thesis, Wagengen University, Delft, the Netherlands.
[5] Mayo, A.W. and Bigambo, T. (2005) Nitrogen Transformation in Horizontal Subsurface Flow Constructed Wetlands I: Model Development. Physics and Chemistry of the Earth, Parts A/B/C, 30, 658-667.
http://dx.doi.org/10.1016/j.pce.2005.08.005
[6] Senzia, M.A., Mashauri, D.A., Mayo, A.W., Mbwette, T.S.A. and Jorgense, S.E. (2002) Modelling Nitrogen Transformation in Horizontal Subsurface Flow Constructed Wetlands Planted with Phragmites Mauritiunius. 8th International Conference on Wetlands Systems for Water Pollution Control, Arusha, Tanzania, 813-827.
[7] Kyambadde, J. (2005) Optimizing Processes for Biological Nitrogen Removal in Nakivubo Wetland, Uganda. Ph.D. Thesis, AlbaNova University Centre.
[8] Verschuren, D., Johnson, T.C., Kling, H.J., Edgington, D.N., Leavitt, P.R., Brown, E.T., Talbot, M.R. and Hecky, R.E. (2002) History and Timing of Human Impact on Lake Victoria, East Africa. Proceedings of the Royal Society Biological Sciences Series B, 269, 289-294
[9] Odada, E.O., Olago, D.O., Kulindwa, K., Ntiba, M. and Wandiga, S. (2004) Mitigation of Environmental Problems in Lake Victoria, East Africa: Causal Chain and Policy Options Analysis. AMBIO, 33, 13-23.
[10] Scheren, P.A.G., Zanting, M.H.A. and Lemmens, A.M.C. (2000) Estimation of Water Pollution Sources in Lake Victoria, East Africa: Application and Elaboration of the Rapid Assessment Methodology. Journal of Environmental Management, 58, 235-248. http://dx.doi.org/10.1006/jema.2000.0322
[11] Lake Victoria Environmental Management Project Phase (LVEMP). (2002) Water Quality and Ecosystem Management Component, Preliminary Findings of Studies Conducted on Lake Victoria.
[12] Hecky, R.E. (1993) The Eutrophication of Lake Victoria. Verhandlungen der Internationalen Vereinigung für Theoretische und Angewandte Limnologie, 25, 39-48.
[13] Guildford, S.J. and Hecky, R.E. (2000) Total Nitrogen, Total Phosphorus and Nutrient Limitation in Lakes and Oceans: Is There a Common Relationship? Limnology and Oceanography, 45, 1213-1223.
http://dx.doi.org/10.4319/lo.2000.45.6.1213
[14] Müller, R. and Wiedemann, O. (1955) Die Bestimmung des Nitrations im Wasser. Vom Wasser, 22, 247-271.
[15] van Dam, A.A., Dardona, A., Kelderman, P. and Kansiime, F. (2007) A Simulation Model for Nitrogen Retention in a Papyrus Wetland Near Lake Victoria, Uganda (East Africa). Wetlands Ecology and Management, 15, 469-480.
http://dx.doi.org/10.1007/s11273-007-9047-5
[16] Dhote, S. and Dixit, S. (2009) Water Quality Improvement through Macrophytes—A Review. Environmental Monitoring and Assessment, 152. 149-153. http://dx.doi.org/10.1007/s10661-008-0303-9
[17] Squires, M.M. and Lesack, L.F.W. (2003) The Relation between Sediment Nutrient Content and Macrophyte Biomass and Community Tructure along a Water Transparency Gradient Mong Lakes of the Mackenzie Delta. Canadian Journal of Fisheries and Aquatic Sciences, 60, 333-344. http://dx.doi.org/10.1007/s10661-008-0303-9
[18] Wetzel, R.G. (2001) Limnology. Saunders College Publishing, San Diego.
[19] Mwanuzi, F., Aalderink, H. and Mdamo, A. (2003) Simulation of Pollution Buffering Capacity of Wetlands Fringing the Lake Victoria. Environmental International, 29, 95-103. http://dx.doi.org/10.1016/S0160-4120(02)00150-2
[20] Stratful, I., Brett, S., Scrimshaw, M.B. and Lester, J.N. (1999) Biological Phosphorus Removal, Its Role in Phosphorus Recycling. Environmental Technology, 20, 681-695. http://dx.doi.org/10.1080/09593332008616863
[21] Krishnaswamy, U., Muthusamy, M. and Perumalsamy, L. (2009) Studies on the Efficiency of the Removal of Phosphate Using Bacterial Consortium for the Biotreatment of Phosphate Wastewater. European Journal of Applied Sciences, 1, 06-15.
[22] Brix, H. (1993) Macrophytes-Mediated Oxygen Transfer in Wetlands: Transport Mechanism and Rate In: Moshiri, G.A. and Arbor, A., Eds., Constructed Wetlands for Water Quality Improvement, Lewis, London.
[23] Abassi, T. and Abbasi, S.A. (2010) Factors Which Facilitate Waste Water Treatment by Aquatic Weeds—The Mechanism of the Weeds. International Journal of Environmental Studies, 67, 349-371.
http://dx.doi.org/10.1080/00207230902978380
[24] Abdo, M.S.A. and Da Silva, C.J. (2000) Nutrient Stock in the Aquatic Macrophytes Eichhornia Crassipes and Pistia Stratiotes in the Pantanal—Brazil. German-Brazilian Workshop on Neotropical Ecosystems—Achievements and Prospects of Cooperative Research. Hamburg.
[25] Russell, J.M., Vanoostrom, A.J. and Lindsey, S.B. (1994) Denitrifying Sites in Constructed Wetlands Treating Agricultural Industry Wastes. Environmental Technology, 15, 95-99. http://dx.doi.org/10.1080/09593339409385408
[26] Wu, M., Franz, E.H. and Chen, S. (2001) Oxygen Fluxes and Ammonia Removal Efficiencies in Constructed Treatment Wetlands. Water Environmental Research, 73, 661-666. http://dx.doi.org/10.2175/106143001X143394

  
comments powered by Disqus

Copyright © 2018 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.