Abstract
Management practices over the past 100 years, especially fire exclusion and suppression, in Yosemite Valley, Yosemite National Park, CA resulted in forest stands with basal areas in excess of 110 m2 ha-1. Accelerated attack by several species of bark beetles (Scolytidae) followed a severe drought in 1976–77. Pinus ponderosa, already under attack by root rot (Heterobasidion annosus) was affected severely, and mortality exceeded 70%. Calocedrus decurrens did not suffer comparable mortality and has replaced P. ponderosa as the dominant species. Size class distributions as well as comparisons of relative density and relative basal area from 1961, 1976 and 1983–85 also demonstrate a major change in forest composition. This change is most pronounced on alluvial landforms.
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References
Bega R. V. & Smith R. S. 1966. Distribution of Fomes annosus in natural forests of California. Plant Dis. Reptr. 50: 832–836.
Cobb Jr, F. W., Parmeter Jr, J. R., Wood, D. L. & Stark, R. W. 1974. Proceedings of the Fourth International Conference on Fomes annosus. Athens, GA. Sept. 17–22, 1973. IUFRO. U.S.D.A. Forest Service. pp. 8–15.
Cottam G. & Curtis J. T. 1956. The use of distance measurements in phytosociological sampling. Ecology 37: 451–460.
Felix, L. S., Parmeter Jr, J. R. & Uhrenholdt, B. 1974. Proceedings of the Fourth International Conference on Fomes annosus. Athens, GA. Sept. 17–22, 1973. IUFRO. U.S.D.A. Forest Service. pp. 2–7.
Gibbens, R. P. & Heady, H. F. 1964. The influence of modern man on the vegetation of Yosemite Valley. California Agr. Expt. Station Manual 36.
Heady, H. F. & Zinke, P. J. 1978. Vegetational changes in Yosemite Valley. National Park Service Occasional Paper Nr 5.
Larsson S., Oren R., Waring R. H. & Barnett J. W. 1983. Attacks of mountain pine beetles as related to tree vigor of ponderosa pine. Forest Sci. 29: 395–402.
Manion P. D. 1981. Tree disease concepts. Prentice-Hall, Inc. Inglewood Cliffs, NJ.
Mueller-Dombois D. & Ellenberg H. 1974. Aims and methods of vegetation ecology. Wiley & Sons, NY.
Muir John. 1894. The mountains of California. Doubleday Inc., Garden City, NY.
Reynolds, R. D. 1959. Effect of natural fires and aboriginal burning upon the forests of the central Sierra Nevada. M. A. thesis. Univ. California, Berkeley.
SmithJr R., Byler J., Wood R. E., Caylor J., Hoskins W. & Scharpnack N. 1983. Pest damage inventory — A method for measuring pest-caused tree mortality in California. In: Forest insect and disease survey methods manual, Section 3.3.1 pp. 1–15. Methods Applications Group, Forest Pest Management, U.S.D.A. Forest Service, Ft. Collins, CO.
U. S. Department of Interior, United States Geological Survey, Water Resources Division. 1971–1981. Water resources data for California. Water-Data Reports CA-71 through CA-81.
U. S. Weather Bureau, N.O.A.A. 1976–1977. Climatological data, California. Monthly reports from Jan. 1976-Dec. 1977.
Vankat, J. L. 1970. Vegetation change in Sequoia National Park, California. Ph.D. dissertation, Univ. Calif., Davis.
van Wagtendonk, J. 1974. Refined burning prescriptions for Yosemite National Park. National Park Service Occasional Paper Nr 2.
Warde W. & Petranka J. W. 1981. A correction factor table for missing point-center quarter data. Ecology 62: 491–494.
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Sherman, R.J., Warren, R.K. Factors in Pinus ponderosa and Calocedrus decurrens mortality in Yosemite Valley, USA. Vegetatio 77, 79–85 (1988). https://doi.org/10.1007/BF00045753
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DOI: https://doi.org/10.1007/BF00045753