References Cited
- Ballard, R., 1980: Phosphorus nutrition and the fertilization of forest trees. In Khasawneh, F. E., Sample, E. C., and Kampreth, E. J. (eds.), The Role of Phosphorus in Agriculture. Madison, Wisc: American Society of Agronomy, 763–804.
- Barry, R. G., 1973: A climatological transect on the east slope of the Front Range, Colorado. Arctic and Alpine Research, 5: 89–110.
- Benedict, J. B., 1984: Rates of tree-island migration, Colorado Rocky Mountains. Ecology, 65: 820–823.
- Bowman, W. D., 1994: Accumulation and use of nitrogen and phosphorus following fertilization in two alpine tundra communities. Oikos, 70: 261–270.
- Brady, N. C., 1990: The Nature and Properties of Soils. 10th ed. New York: MacMillian Publishing Company, Inc. 639 pp.
- Burns, S., 1980: Alpine soils of the Indian Peaks, Colorado. Ph.D. dissertation, University of Colorado, Boulder, Colorado. 360 pp.
- Cross, A. F. and Schlesinger, W. H., 1995: A literature review and evaluation of the Hedley fractionation: Applications to the biogeochemical cycle of soil phosphorus in natural ecosystems. Geoderma, 64: 197–214.
- Greenland, D., 1989: The climate of Niwot Ridge, Front Range, Colorado, U.S.A. Arctic and Alpine Research, 21: 380–391.
- Harrison, A. F., 1982a: Labile organic phosphorus mineralization in relationship to soil properties. Soil Biology and Biochemistry, 14: 343–351.
- Hedley, M. J., Stewart, J. W. B., and Chauhan, B. S., 1982a: Changes in inorganic and organic soil phosphorus fractions by cultivation practices and by laboratory incubations. Soil Science Society American Journal, 46: 970–976.
- Holtmeier, F. K. and Broil, G., 1992: The influence of tree islands and microtopography on pedoecological conditions in the forest-alpine ecotone on Niwot Ridge, Colorado Front Range, U.S.A. Arctic and Alpine Research, 24: 216–228.
- Isard, S. A., 1986: Factors influencing soil moisture and plant community distribution on Niwot Ridge, Front Range, Colorado. Arctic and Alpine Research, 18: 83–96.
- Jenny, H., 1930: A study on the influence of climate upon the nitrogen and organic matter content of the soil. University of Missouri College of Agriculture, Agricultural Experiment Station Bulletin 152. 66 pp.
- Körner, C., 1989: The nutritional status of plants from high altitudes. Oecologia, 81: 379–391.
- Marr, J. W., 1977: The development and movement of tree islands near the upper limit of tree growth in the southern Rocky Mountains. Ecology, 58: 1159–1164.
- McGill, W. B. and Cole, C. V., 1981: Comparative aspects of nutrient cycling of organic C, N, S and P through soil organic matter. Geoderma, 26: 267–286.
- Pauker, S. J. and Seastedt, T. R., 1996: Effects of mobile tree islands on soil carbon storage in tundra systems. Ecology, 77: 2563–2567.
- Paul, E. A. and Clark, F. E., 1989: Soil Microbiology and Biochemistry. San Diego: Academic Press, Inc. 273 pp.
- Pearcy, R. W., Ehleringer, J. W., Mooney, H. A., and Rundel, P. W., 1989: Plant Physiological Ecology: Field Methods and Instrumentation. New York: Chapman and Hall. 457 pp.
- Prokopy, W. R., 1992: QuikChem Method 10-115-01-1-B: Determination of orthophosphate by flow injection analysis colorimetry. Milwaukee, Wisc.: Lachat Instruments, Inc.
- Schoenau, J. J., Stewart, J. W. B., and Bettany, J. R., 1989: Forms and cycling of phosphorus in prairie and boreal forest soils. Bio geochemistry, 8: 223–237.
- Smith, B. F. L. and Bain, D. C., 1982: A sodium hydroxide fusion method for the determination of total phosphate in soils. Soil Science, 13: 185–1990.
- Srivastava, S. C. and Singh, J. S., 1988: Carbon and phosphorus in the soil biomass of some tropical soils of India. Soil Biology and Biochemistry, 20: 743–747.
- Stewart, J. W. B. and McKercher, R. B., 1982: Phosphorus cycle. In Burns, R. G. and Slater, J. H. (eds.), Experimental Microbial Ecology. Blackwell: Oxford, 221–238.
- Tate, K. R. and Salcedo, I., 1988: Phosphorus control of soil organic matter accumulation and cycling. Biogeochemistry, 5: 99–107.
- Tiessen, H. and Moir, J. O., 1993: Characterization of available P by sequential extraction. In Carter, M. R. (ed.), Soil Sampling and Methods of Analysis. Lewis Publishers, 75–85.
- Walbridge, M. R., Richardson, C. J., and Swank, W. T., 1991: Vertical distribution of biological and geochemical phosphorus subcycle in two southern Appalachian forest soils. Biogeochemistry, 13: 61–85.
- Walker, T. W. and Syers, J. K., 1976: The fate of phosphorus during pedogenesis. Geoderma, 15: 1–19.
- Walker, D. A., Halfpenny, J. C., Walker, M. D., and Wessman, C. A., 1993: Long-term studies of snow-vegetation interactions. BioScience, 43: 287–301.
- Wood, T. M., Bormann, F. H., and Voigt, G. K., 1984: Phosphorus cycling in a northern hardwood forest. Science, 223: 391–393.