188 Scharenbroch and Lloyd: Particulate Organic Matter and Soil Nitrogen Availability CONCLUSION Investigations of soil nitrogen, microbes, and organic matter quantity and quality reveal information of the dynamic pro- cesses that determine nitrogen availability in these soils. Pre- scribing a fertilization treatment without investigating the soil nitrogen status is currently acceptable (ANSI A300 2001) and common because of limited nitrogen assessment technology. We have shown that spatial variability in soil nitrogen exists among these urban landscapes, and it is important to account for this when making nitrogen management decisions. Of the nitrogen diagnostic techniques examined, fine POM measure- ments had the greatest potential to serve as practical methods of accurately estimating soil nitrogen availability in these urban landscapes. Once POM measures are tested with fer- tilization and plant performance, they could serve as rela- tively easy and beneficial incorporations to plant health care programs and would help to emphasize the roles urban land- scape managers have as stewards of urban environments. Acknowledgments. We thank Richard Gill, Ph.D., Jodi Johnson-Maynard, Ph.D., Donald Thill, Ph.D., Robert Tri- pepi, Ph.D., and the anonymous review- ers for their suggestions. We also thank the TREE Fund (John Duling Grant) and the University of Idaho Seed Grant for their support of this project. This article is dedicated to the memory of Benjamin R. Stinner. LITERATURE CITED Alvarez, C.R., R. Alvarez, M.S. Grigera, and R.S. Lavado. 1998. Associations between organic matter fractions and the active soil microbial biomass. Soil Biology & Bio- chemistry 30:767–773. Anderson, J.P.E., and K.H. Domsch. 1978. A physiological method for the quantitative measurement of microbial biomass in soils. 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