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- Title
NITROGEN AND PHOSPHORUS MINERALIZATION IN THREE WETLAND TYPES IN SOUTHEAST ALASKA, USA.
- Authors
Fellman, Jason B.; D'Amore, David V.
- Abstract
To improve our ability to predict how different wetland soils cycle nutrients, it is necessary to gain an understanding of N and P net mineralization rates. Since information on mineralization rates in southeast Alaska is limited, this study will improve our ability to predict how different wetlands affect soil nutrient processing. Net N and P mineralization rates were measured both in situ and via lab incubations to evaluate both actual and potential mineralization rates in three wetland types: bogs; forested wetlands: and riparian wetlands. Soil pH was an important controlling variable for both net N and P mineralization rates and soil phosphorus content significantly influenced net P mineralization rates. In situ net mineralization rates ranged from 410--I.710 µg N kg soil -1 day -1 for N and from 2- 27 µg P kg soil -1 day -1 for P after 56 days. Lab incubations revealed mineralization potentials were 2 3 times greater than in situ rates. Net N and P mineralization potentials were greatest in the riparian wetlands and were significantly different from the bogs and forested wetlands. In contrast, the bogs mineralized a greater proportion of the total N and P soil pool (lag nutrient mineralized per gram nutrient) and indicates greater internal nutrient cycling within bogs. These results suggest that different wetland types of southeast Alaska process N and P differently and these wetland types should be evaluated separately in future evaluations of wetland ecosystem function.
- Subjects
SOUTHEAST Alaska; ALASKA; NUTRIENT cycles; BIOMINERALIZATION; PHOSPHORUS in soils; NITROGEN; FORESTED wetlands; RIPARIAN areas; BOGS; NITRIFICATION
- Publication
Wetlands, 2007, Vol 27, Issue 1, p44
- ISSN
0277-5212
- Publication type
Article
- DOI
10.1672/0277-5212(2007)27[44:NAPMIT]2.0.CO;2