Urban influences on the nitrogen cycle in Puerto Rico

  • Jorge R. Ortiz-Zayas
  • Elvira Cuevas
  • Olga L. Mayol-Bracero
  • Loreto Donoso
  • Ivonne Trebs
  • Debora Figueroa-Nieves
  • William H. McDowell


Anthropogenic actions are altering fluxes of nitrogen (N) in the biosphere at unprecedented rates. Efforts to study these impacts have concentrated in the Northern hemisphere, where experimental data are available. In tropical developing countries, however, experimental studies are lacking. This paper summarizes available data and assesses the impacts of human activities on N fluxes in Puerto Rico, a densely populated Caribbean island that has experienced drastic landscape transformations over the last century associated with rapid socioeconomic changes. N yield calculations conducted in several watersheds of different anthropogenic influences revealed that disturbed watersheds export more N per unit area than undisturbed forested watersheds. Export of N from urban watersheds ranged from 4.8 kg ha−1 year−1 in the Rí o Bayamón watershed to 32.9 kg ha−1 year−1 in the highly urbanized Río Piedras watershed and 33.3 kg ha−1 year−1 in the rural-agricultural Río Grande de Añasco watershed. Along with land use, mean annual runoff explained most of the variance in fluvial N yield. Wastewater generated in the San Juan Metropolitan Area receives primary treatment before it is discharged into the Atlantic Ocean. These discharges are N-rich and export large amounts of N to the ocean at a rate of about 140 kg ha−1 year−1. Data on wet deposition of inorganic N (NH 4 + + NO 3 ) suggest that rates of atmospheric N deposition are increasing in the pristine forests of Puerto Rico. Stationary and mobile sources of NOx (NO+NO2) and N2O generated in the large urban centers may be responsible for this trend. Comprehensive measurements are required in Puerto Rico to quantitatively characterize the local N cycle. More research is required to assess rates of atmospheric N deposition, N fixation in natural and human-dominated landscapes, N-balance associated with food and feed trade, and denitrification.

Key words

Nitrogen Peurto Rico Urbanization Land use change Waste water disposal Atmospheric nitrogen deposition Caribbean Water quality Air quality 


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  1. AAPFCO. 2002. Commercial Fertilizers 2002. Association of American Plant Food Control Officials. Columbia, MO.Google Scholar
  2. Aber J., McDowell W., Nadelhoffer K., Magill A., Bernston G., Kamakea M., McNulty S., Currie W., Rustad L. and Fernandez I. 1998. Nitrogen saturation in temperate forest ecosystems: hypotheses revisited. Bioscience 48: 921–934.CrossRefGoogle Scholar
  3. Aber J.D., Goodale C.L., Ollinger S.V., Smith M.L., Magill A.H., Martin M.E., Hallett R.A. and Stoddard J.L. 2003. Is nitrogen deposition altering the nitrogen status of northeastern forests? Bioscience 53: 375–389.CrossRefGoogle Scholar
  4. Aide T.M. and Grau H.R. 2004. Globalization, migration, and Latin American ecosystems. Science 305: 1915–1916.PubMedCrossRefGoogle Scholar
  5. Birdsey R.A. and Weaver P.L. 1987. Forest area trends in Puerto Rico. USDA Forest Service, Southern Experiment Station SO-331. 5 pp.Google Scholar
  6. Cassman K.G., Doberman A. and Walters D.T. 2002. Agroecosystems, nitrogen-use, efficiency, and nitrogen management. Ambio 31: 132–140.PubMedGoogle Scholar
  7. Chestnut T.J. and McDowell W.H. 2000. C and N dynamics in the riparian and hyporheic zones of a tropical stream, Luquillo Mountains, Puerto Rico. J. North Am. Benthol. Soc. 19: 199–214.CrossRefGoogle Scholar
  8. Conde-Costas C. and Gómez-Gómez F. 1998. Nitrate contamination of the upper aquifer in the Manatí-Vega Baja Area, Puerto Rico. Third International Symposium on Tropical Hydrology. San Juan, Puerto Rico, July 12–16, 1998. American Water Resources Association.Google Scholar
  9. Cornell S.E., Jickells T.D., Cape J.N., Rowland A.P. and Duce R.A. 2003. Organic nitrogen deposition on land and coastal environments: a review of methods and data. Atmos. Environ. 37: 2173–2191.CrossRefGoogle Scholar
  10. Corredor J.E. and Capone D.G. 1985. Studies on nitrogen diagenesis in coral reef sands. In: Gomez E. (ed.), Proceedings 5th International Coral Reef Symposium, Vol. 3, pp. 395–399.Google Scholar
  11. Corredor J.E., Morell J.M. and Diaz M.R. 1992. Environmental degradation, nitrogen dynamics and proliferation of the filamentous Cyanophyta Microcoleus lyngbyaceus in nearshore Caribbean waters. In Mediterraneo e Caraibi due mari in pericolo? Sversamenti accidentali di idrocarburi ed emergenze causate dalle alghe. Atti del cenvegno internazionale. Cuaderni delle ICRAM/IFREMER: 91–100.Google Scholar
  12. Corredor J.E. and Morel J.M. 1994. Nitrate depuration of secondary sewage effluents in mangrove sediments. Estuaries 17: 295–300.CrossRefGoogle Scholar
  13. Corredor J.E., Morell J.M. and Bauza J. 1999a. Atmospheric nitrous oxide fluxes from mangrove sediments. Marine Pollut. Bull. 38: 473–478.CrossRefGoogle Scholar
  14. Corredor J.E., Howarth R.W., Twilley R.R. and Morell J.M. 1999b. Nitrogen cycling and anthropogenic impact in the tropical interamerican seas. Biogeochemistry 46: 163–178.Google Scholar
  15. Dietz J.L. 1986. Economic history of Puerto Rico. Institutional change and Political and development. Princeton University, NJ.Google Scholar
  16. Downing J.A., McClain M., Twilley R., Melack J.M., Elser J., Rabalis N.N., Lewis W.M. Jr., Turner R.E., Corredor J., Soto D., Yanez-Arancibia A., Kopaska J.A. and Howarth R.W. 1999. The impact of accelerating land-use change on the N-Cycle of tropical aquatic ecosystems: current conditions and projected changes. Biogeochemistry 46: 109–148.Google Scholar
  17. Díaz P.L., Aquino Z., Figueroa-Alamo C., García, R. and Sánchez A.V. 2004. Water Resources Data: Puerto Rico and the U.S. Virgin Islands, Water Year 2002. US Geological Survey Water-Data Report PR-02-1. 672 pp.Google Scholar
  18. DNER. 1999. Puerto Rico State Action Plan to reduce greenhouse gas emissions. Final Report, Department of Natural and Environmental Resources, Energy Affairs Administration, Government of Puerto Rico, 456 pp.Google Scholar
  19. DNER. 2005. Plan Integral de Aguas de Puerto Rico. Oficina del Plan Integral de Aguas. Departamento de Recursos Naturales y Ambientales. San Juan, P.R. Scholar
  20. Erickson H., Keller M. and Davidson E.A. 2001. Nitrogen oxide fluxes and nitrogen cycling during postagricultural succession and forest fertilization in the humid tropics. Ecosystems 4: 67–84.CrossRefGoogle Scholar
  21. Filoso S., Martinelli L.A., Williams M.R., Lara L.B.L.S., Krusche A, Ballester M.V., Victoria R.L. and Camargo P.B. 2003. Land use and nitrogen export in the Piracidaba River Basin, Southeast Brazil. Biogeochemistry 65(3): 275–294.CrossRefGoogle Scholar
  22. Galloway J.N., Howarth R.W., Michaels A.F., Nixon S.W., Propero J.M. and Dentener F.J. 1996. Nitrogen and phosphorus budgets of the North Atlantic Ocean and its watershed. Biogeochemistry 35: 3–25.CrossRefGoogle Scholar
  23. Galloway J.N., Levy H. II and Kasibhatla P.S. 1994. Year 2020: Consequences of population growth and development on the deposition of oxidized nitrogen. Ambio 23: 120–123.Google Scholar
  24. Galloway J.N., Schlesinger W.H., Levy H. II, Michaels A. and chnoor J.L. 1995. Nitrogen fixation: anthropogenic enhancement-environmental response. Global Biogeochem. Cycles 9: 235–252.CrossRefGoogle Scholar
  25. Galloway J.N. 1998. The global nitrogen cycle: changes and consequences. Environ. Pollut. 102: 15–24.CrossRefGoogle Scholar
  26. Galloway J.N. and Cowling E.B. 2002. Reactive nitrogen and the world: consequences for terrestrial ecosystems. Ambio 31: 64–71.PubMedGoogle Scholar
  27. Galy-Lacaux C., Carmichaël G.R., Song C.H., Lacaux J.P. and Galwa J. 2003. Dry and wet atmospheric nitrogen deposition in Africa. IGAC Newslett. Article 27: 6–11.Google Scholar
  28. Gleick P., Burns W.C.G., Chalecki E.L., Cohen M., Kao-Cushing K., Mann A.S., Reyes R., Wolf G.H. and Wong A.K. (2002). The World’s Water: The Biennal Report on Freshwater Resources 2002–2003. Island Press, Washington, 335 pp.Google Scholar
  29. Grau H.R., Aide T.M., Zimmerman J.K. and Thomlinson J.B. 2004. Trends and scenarios of the carbon budget in postagricultural Puerto Rico (1936–2060). Global Change Biol. 10: 1–17.CrossRefGoogle Scholar
  30. Grau H.R., Aide T.M., Zimmerman J.K., Thomlinson J.B., Helmer E. and Zou X. 2003. The ecological consequences of socioeconomic and land-use changes in postagriculture Puerto Rico. Bioscience 53: 1159–1168.CrossRefGoogle Scholar
  31. Gould W., Martinuzzi S., Fevold B. and Ramos O. 2005. Urban and Developed Landcover of Puerto Rico, Vieques, and Culebra, 2000–2003. Map 2005-1. USDA Forest Service, International Institute of Tropical Forestry, Río Piedras, Puerto Rico.Google Scholar
  32. Helmer E.H., Ramos O., López T. del M., Quiñones M. and Díaz W. 2002. Mapping the forest type and land cover of Puerto Rico, a component of the Caribbean Biodiversity Hotspot. Caribbean J. Sci. 38(3–4): 165–183.Google Scholar
  33. Holland E.A., Dentener F.J., Braswell B.H. and Sulzman J.M. 1999. Contemporary and preindustrial global reactive nitrogen budgets. Biogeochemistry 46: 7–43.Google Scholar
  34. Howarth R.W., Billen G., Swaney D., Townsend A., Jaworski N., Lajtha K., Downing J.A., Elmgren R., Caraco N., Jordan T., Berendse F., Freney J., Kudeyarov V., Murdoch P. and Zhao-Liang Z. 1996. Regional nitrogen budgets and riverine N and P fluxes for the drainages to the North Atlantic Ocean: natural and human influences. Biogeochemistry 35: 75–139.CrossRefGoogle Scholar
  35. Howarth R.W., Boyer E.W., Pabich W.J. and Galloway J.V. 2002. Nitrogen use in the United States from 1961–2000 and potential future trends. Ambio 31: 88–96.PubMedGoogle Scholar
  36. Hunter J.M. and Arbona S.I. 1995. Paradise lost: an introduction to the geography of water pollution in Puerto Rico. Soc. Sci. Med. 40: 1331–1355.PubMedCrossRefGoogle Scholar
  37. Lewis W.M. Jr., Melack J.M., McDowell W.H., McClain M.M. and Richey J.E. 1999. Nitrogen yields from undisturbed watersheds in the Americas. Biogeochemistry 46: 149–162.CrossRefGoogle Scholar
  38. López T. del M., Aide T.M. and Thomlinson J.R. 2001. Urban expansion and the loss of prime agricultural land in Puerto Rico. Ambio 30: 49–54.PubMedGoogle Scholar
  39. Martinelli L.A., Howarth R.W., Cuevas E., Filoso S., Austin A., Donoso L., Huzsar V., Keeney D., Lara L.L., Llerena C., McIssac G., Medina E., Ortiz-Zayas, J.R., Scavia D., Schindler D.W., Soto D. and Townsend A. (this issue). The origin and fate of reactive nitrogen in Latin America and the Caribbean. Biogeochemistry.Google Scholar
  40. Martinelli L.A., Piccolo M.C., Twonsend A.R., Vitousek P.M., Cuevas E., McDowell W.M., Robertson G.P., Santos O.C. and Treseder K. 1999. Nitrogen stable isotopic composition of leaves and soil: tropical versus temperate forests. Biogechemistry 46: 45–65.Google Scholar
  41. Matson P.A., McDowell W.H., Townsend A.R. and Vitousek P.M. 1999. The globalization of N deposition: ecosystem consequences in tropical environments. Biogeochemistry 46: 67–83.Google Scholar
  42. Matthews E. 1994. Nitrogenous fertilizers: global distribution of consumption and associated emissions of nitrous oxide and ammonia. Global Biogeochem. Cycles 8: 411–439.CrossRefGoogle Scholar
  43. McDowell W.H. 2001. Hurricanes, people, and riparian zones: controls on nutrient losses from forested Caribbean watersheds. For. Ecol. Manage. 154: 443–451.CrossRefGoogle Scholar
  44. McDowell W.H. 2002. Nutrient export from tropical rain forests. In: Ambasht R.S. and Ambasht N. K. (eds), Modern Trends in Applied Terrestrial Ecology. Kluwer Academic Press, pp. 149–163.Google Scholar
  45. McDowell W.H. 2003. Dissolved organic matter in soils-future directions and unanswered questions. Geoderma 113: 179–186.CrossRefGoogle Scholar
  46. McDowell W.H., Ginés-Sanchez C., Asbury C.E. and Ramos-Pérez C.R. 1990. Influence of seasalt aerosols and long range transport on precipitation chemistry at El Verde, Puerto Rico. Atmos. Environ. 24: 2813–2821.Google Scholar
  47. McDowell W.H. and Asbury C.E. 1994. Export of carbon, nitrogen, and major ions from three tropical montane watersheds. Limnol. Oceanogr. 39: 111–125.Google Scholar
  48. McDowell W.H., McSwiney C.P. and Bowden W.B. 1996. Effects of hurricane disturbance on groundwater chemistry and riparian function in a tropical rain forest. Biotropica 28: 577–584.CrossRefGoogle Scholar
  49. McSwiney C.P., McDowell W.H. and Keller M. 2001. Distribution of nitrous oxide and regulators of its production across a tropical rainforest catena in the Luquillo Experimental Forest, Puerto Rico. Biogeochemistry 56: 265–286.CrossRefGoogle Scholar
  50. Meixner F.X. 1994. Surface exchange of odd nitrogen oxides. Nova Acta Leopoldina NF 70(288): 299–348.Google Scholar
  51. Meybeck M., Chapman D.V. and Helmer R. 1989. Global Freshwater Quality: A First Assessment. World Health Organization/ UNEP Basil Blackwell, Inc., Cambridge, MA.Google Scholar
  52. Mosier A.R., Delgado J.A. and Keller M. 1998. Methane and nitrous oxide fluxes in an acid oxisol in western Puerto Rico: Impact of tillage, liming, and fertilization. J. Soil Biol. Biochem. 30: 2087–2098.CrossRefGoogle Scholar
  53. Morel J.M. and Corredor J.E. 1993. Sediment nitrogen trapping in a mangrove lagoon. Esturine, Coastal Shelf Sci. 37: 203–212.CrossRefGoogle Scholar
  54. Mosquera A.I., Corredor J.E. and Morel J.M. 1998. Exponential collapse of benthic depurative capacity in a eutrophic tropical marine ecosystem: a threshold response to organic nitrogen loading. Chem. Ecol. 14: 341–335.Google Scholar
  55. Ortiz-Zayas J.R., Quiñones F., Palacios S., Vélez A. and Más H. (2004). Características y condición de los embalses principales en Puerto Rico. Oficina del Plan Integral de Aguas, Departamento de Recursos Naturales y Ambientales, San Juan, P.R., 179 pp.Google Scholar
  56. Osterkamp W.R. 2001. Earth-Surface Processes, Materials Use, and Urban Development — A Case Study of the SJMA, Northeastern Puerto Rico. U.S. Geological Survey Water Resources Division, Tucson, AZ, pp. 1–23.Google Scholar
  57. Peterson B.J., Wollheim W., Mulholland P.J., Webster J.R., Meyer J.L., Tank J.L., Grimm N.B., Bowden W.B., Vallet H.M., Hershey A.E., McDowell W.H., Dodds W.K., Hamilton S.K., Gregory S.V. and D’Angelo D.J. 2001. Stream processes alter the amount and form of nitrogen exported from small watersheds. Science 292: 86–90.PubMedCrossRefGoogle Scholar
  58. Pico R. 1975. Nueva geografía de Puerto Rico. Editorial Universitaria Universidad de Puerto Rico, San Juan PR., 460 pp.Google Scholar
  59. PRASA. 2005. Report on PRASA’s WWTPs in operation in the SJMA. Puerto Rico Aqueduct and Sewer Authority. San Juan, P.R.Google Scholar
  60. Propero J.M., Barrett K., Church T., Dentener F., Duce R.A., Galloway J.N., Levy H. II and Moody J. 1996. Atmospheric deposition of nutrients to the North Atlantic Basin. Biogeochemistry 35: 27–73.CrossRefGoogle Scholar
  61. Puerto Rico Planning Board 1995. Proyecciones de población: Puerto Rico 1990–2025. Area de Planificación Económica y Social, Oficina del Gobernador, San Juan, P.R.Google Scholar
  62. Puerto Rico Planning Board. 2005. Population projections based in the 2000 Census. Scholar
  63. Puerto Rico Planning Board 2005b. Imports of Recorded Merchandise by North American Industrial Classification System (NAICS). Economic and Social Planning Program, San Juan, P.R.Google Scholar
  64. Ramos-Ginés O. 1997. Water balance and quantification of total phosphorus and total nitrogen loads entering and leaving the Lago de Cidra, Central Puerto Rico. US Geological Survey, Water-Resources Investigations Report 96-4222. San Juan, Puerto Rico. 28 pp.Google Scholar
  65. Schlesinger W.H. 1991. Biogeochemistry: An Analysis of Global Change. Academic Press, Inc., New York, 443 pp.Google Scholar
  66. Socolow R.H. 1999. Nitrogen management and the future of food: lessons learned from management of energy and carbon. Proc. Nat. Acad. Sci. 96: 6001–6008.PubMedCrossRefGoogle Scholar
  67. Sotomayor-Ramírez D., Martínez G.A., Pérez-Alegría L.R. 2004. Nutrient Discharges from Mayaguez Bay Watershed: Final Progress Report. University of Puerto Rico, College of Agricultural Sciences, Mayaguez, P.R., 56 pp.Google Scholar
  68. Swistock B.R., Edwards P.J., Wood F. and Dewalle D.R. 1997. Comparison of methods for calculating annual solute exports from six forested Appalachian watersheds. Hydrol. Process. 11: 655–669.CrossRefGoogle Scholar
  69. Thomlinson J.R. and Rivera L.Y. 2000. Suburban growth in Luquillo, Puerto Rico: some consequences of development on natural and semi-natural systems. Landscape Urban Plan. 49: 15–23.CrossRefGoogle Scholar
  70. Townsend A.R., Howarth R.W., Bazzaz F.A., Booth M.S., Cleveland C.C., Collinge S.K., Dobson A.P., Epstein P.R., Holland E.A., Keeney D.R., Malling M.A., Rogers C.A., Wayne P. and Wolfe A.H. 2003. Human health effects of a changing global nitrogen cycle. Fron. Ecol. Environ. 1: 240–246.CrossRefGoogle Scholar
  71. Trebs I., Lara L.S., Zeri L.M., Gatti L.V., Artaxo P., Dlugi R., Slanina J., Andreae M.O. and Meixner F.X. 2006. Dry and wet deposition of atmospheric inorganic nitrogen compounds in a tropical environment (Rondônia, Brazil). Atmos. Chem. Phys. 6: 447–469.CrossRefGoogle Scholar
  72. USDA 2004. Puerto Rico 2002 Census of Agriculture. National Agricultura Statistics Service. Jeffersonville, IN.Google Scholar
  73. USGS 2002. Provisional Hydrologic Unit Boundaries for Puerto Rico — Watershed and Subwatershed Level. GIS Dataset. USGS Caribbean District, San Juan, Puerto Rico.Google Scholar
  74. Vitousek P.M., Aber J., Howarth R.W., Likens G.E., Matson P.A., Schindler D.W., Schlesinger W.H. and Tilman G.D. 1997. Human alteration of the global nitrogen cycle: causes and consequences. Ecol. Appl. 7: 737–750.Google Scholar
  75. Zweifler M., Gold M.A. and Thomas R.N. 1994. Land use evolution in hill regions of the Dominican Republic. Profess. Geographer 46: 39–53.CrossRefGoogle Scholar

Copyright information

© Springer 2006

Authors and Affiliations

  • Jorge R. Ortiz-Zayas
    • 1
  • Elvira Cuevas
    • 2
  • Olga L. Mayol-Bracero
    • 1
  • Loreto Donoso
    • 3
  • Ivonne Trebs
    • 4
  • Debora Figueroa-Nieves
    • 5
  • William H. McDowell
    • 5
  1. 1.Institute for Tropical Ecosystem StudiesSan JuanPuerto Rico
  2. 2.Department of BiologyUniversity of Puerto RicoSan JuanPuerto Rico
  3. 3.Instituto Venezolano de Investigaciones Científicas (IVIC)CaracasVenezuela
  4. 4.Max Planck Institute for ChemistryMainzGermany
  5. 5.University of New HampshireDurhamUSA

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