Prediction of Soil Nitrogen Availability in Forest Ecosystems: A Literature Review
The increasing interest in the use of N fertilizers to stimulate forest growth is prompting consideration of laboratory soil testing methods to predict the probability of N response. However, even in tilled agricultural systems, laboratory tests for N availability are not widely accepted. To be successful in predicting N response in the forest ecosystem, many additional factors than those used in agriculture must be considered. These include the sources and sinks of N and the internal redistribution of N in the trees, as well as intensity of management. Problems also exist with selection of the sample, since the forest floor litter oftentimes constitutes a major reservoir of N. Availability of this N will be difficult to estimate. Spatial variability also presents formidable obstacles in obtaining a valid sample. However, some success with N availability tests has been reported in the Douglas-fir ecosystems of western United States, particularly with the anaerobic incubation method. Further progress will require considerable research effort and careful attention to the N cycle. Forest Sci. 26:159-171.
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Document Type: Journal Article
Affiliations: Professor, Department of Soil Science, University of Wisconsin, Madison, WI 53706
Publication date: 1980-03-01
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- Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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