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SOURCES OF PHOSPHORUS AND NITROGEN FOR LAKES ON AFOGNAK ISLAND 1
Author(s) -
Dugdale Richard C.,
Dugdale Vera A.
Publication year - 1961
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1961.6.1.0013
Subject(s) - streams , inlet , nitrogen , hydrology (agriculture) , phosphorus , watershed , environmental science , nitrate , surface runoff , stratification (seeds) , humus , eutrophication , soil science , ecology , nutrient , geology , chemistry , oceanography , soil water , agronomy , biology , seed dormancy , computer network , germination , geotechnical engineering , organic chemistry , machine learning , dormancy , computer science
The contribution of inlet streams to the phosphorus and nitrogen budgets of two lakes on Afognak Island (Kodiak Region), Alaska has been studied with special reference to the morphology of the associated watersheds. One lake drains a steep, vast watershed; the other, a relatively flat, restricted one. Streams coming from the steeper slopes show a lower PO 4 ‐P concentration than those coming from shallow slopes as might be expected from runoff— residence considerations. Exactly the opposite is found when the nitrate concentration of these streams is examined, i.e. , only the streams arising on steep slopes show appreciable amounts of nitrate. Phosphorus appearing in the inlets probably originates in the Katmai ash which lies just under the humus layer of soil. Three distinct layers of ash occur normally. A complex pattern of phosphorus distribution can probably be attributed to differences in the permeability of these layers to water. A model has been constructed as an aid to interpretation of the data. Thickets of nitrogen fixing alders, found only along steep stream banks, may be the source of the nitrate content of these streams.