Biogeochemistry

, Volume 47, Issue 3, pp 239–267

The effect of permafrost on stream biogeochemistry: A case study of two streams in the Alaskan (U.S.A.) taiga

Authors

  • Robert MacLean
    • Department of Biology and Wildlife and Institute of Arctic BiologyUniversity of Alaska Fairbanks
  • Mark W. Oswood
    • Department of Biology and Wildlife and Institute of Arctic BiologyUniversity of Alaska Fairbanks
  • John G. IronsIII
    • Department of Biology and Wildlife and Institute of Arctic BiologyUniversity of Alaska Fairbanks
  • William H. McDowell
    • Department of Natural ResourcesUniversity of New Hampshire
Article

DOI: 10.1007/BF00992909

Cite this article as:
MacLean, R., Oswood, M.W., Irons, J.G. et al. Biogeochemistry (1999) 47: 239. doi:10.1007/BF00992909

Abstract

Understanding interactions between permanently frozen soils and stream chemistry is important in predicting the effects of management, natural disturbance and changing permafrost distribution on stream ecosystems and nutrient budgets in subarctic watersheds. Chemical measurements of groundwater, soil water and stream water were made in two watersheds in the taiga of interior Alaska. One watershed (HiP) had extensive permafrost and the other (LoP) had limited permafrost. Soil water collected within the rooting zone (0.3–0.5 m) in both watersheds was high in dissolved organic carbon (DOC), dissolved organic nitrogen (DON) and dissolved inorganic nitrogen (DIN) but low in dissolved minerals (dominantly Ca, Mg and Na) and conductivity. The reverse was true for groundwater from springs and wells. Permafrost in the HiP basin prevented deep percolation of water and generated stormflows rich in DOC. The presence of permafrost in HiP resulted in higher fluxes of DOC, DON and DIN into stream water from upland soils.

Key words

Alaskabiogeochemistrypermafroststreamstaigawatershed

Copyright information

© Kluwer Academic Publishers 1999