Rate of aerobic nitrogen transformations in six acid climax forest soils and the effect of phosphorus and CaCO3
Nitrogen transformations (mineralization, nitrification, and nitrous oxide production) were evaluated in acid forest floor soils collected from six climax forest sites on Blackhawk Island, Wisconsin. Soils' acidity (CaCl2) ranged from pH 3.9 to 5.1, and organic matter concentrations varied from 2.4 to 59.0 percent. The samples were incubated aerobically for 4 weeks at 30C under field moist conditions. Treatments were: control; 100 mg P (as KH2PO4) kg soil; CaCO3; and P with CaCO3. Nitrification of mineralized N ranged from nearly complete in the SM Alfisol to almost non-existent in the Histosol. Addition of P had little effect on ammonification or nitrification. Liming, however, greatly enhanced ammonification on nonnitrifying or slowly nitrifying soils and both ammonification and nitrification in nitrifying soils. Adding P and lime together did not affect N transformations compared to liming alone. Nitrous oxide emission rates in the soils were related to nitrification. From 0.03 to 0.3 percent of the NH4-N nitrified was released as N2O-N. Phosphorus addition had little effect but liming increased N2O emission rates in soil where nitrification was also enhanced.
- Research Organization:
- Univ. of Wisconsin, Madison
- OSTI ID:
- 6294152
- Journal Information:
- For. Sci.; (United States), Journal Name: For. Sci.; (United States) Vol. 31:3; ISSN FOSCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
BIOLOGICAL MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
DATA
ECOSYSTEMS
ELEMENTS
ENVIRONMENTAL EFFECTS
EXPERIMENTAL DATA
FOREST LITTER
FORESTS
INFORMATION
INHIBITION
LIMING
MATERIALS
MINERALIZATION
NITRIFICATION
NITROGEN COMPOUNDS
NITROGEN CYCLE
NITROGEN OXIDES
NITROUS OXIDE
NONMETALS
NUMERICAL DATA
ORGANIC MATTER
OXIDES
OXYGEN COMPOUNDS
PH VALUE
PHOSPHORUS
SOIL CHEMISTRY
SOILS
TERRESTRIAL ECOSYSTEMS