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Present and past old-growth forests of the Lake Tahoe Basin, Sierra Nevada, US

2002; Wiley; Volume: 13; Issue: 4 Linguagem: Inglês

10.1658/1100-9233(2002)013[0461

1654-1103

Matthew A. Barbour, Elizabeth Ann Kelley, Patricia E. Maloney, David M. Rizzo, E. B. Royce, J. Fites‐Kaufmann,

Plant Water Relations and Carbon Dynamics

Journal of Vegetation ScienceVolume 13, Issue 4 p. 461-472 Present and past old-growth forests of the Lake Tahoe Basin, Sierra Nevada, US M. Barbour, Corresponding Author M. Barbour Department of Environmental Horticulture, University of California, Davis, CA 95616, USA*Corresponding author; E-mail [email protected]Search for more papers by this authorE. Kelley, E. Kelley Department of Environmental Science and Policy, University of California, Davis, CA, USASearch for more papers by this authorP. Maloney, P. Maloney Department of Plant Pathology, University of California, Davis, CA, USASearch for more papers by this authorD. Rizzo, D. Rizzo Department of Plant Pathology, University of California, Davis, CA, USASearch for more papers by this authorE. Royce, E. Royce Department of Environmental Horticulture, University of California, Davis, CA 95616, USASearch for more papers by this authorJ. Fites-Kaufmann, J. Fites-Kaufmann USDA Forest Service, Nevada City, CA 95959, USA Department of Environmental Science and Policy, University of California, Davis, CA, USASearch for more papers by this author M. Barbour, Corresponding Author M. Barbour Department of Environmental Horticulture, University of California, Davis, CA 95616, USA*Corresponding author; E-mail [email protected]Search for more papers by this authorE. Kelley, E. Kelley Department of Environmental Science and Policy, University of California, Davis, CA, USASearch for more papers by this authorP. Maloney, P. Maloney Department of Plant Pathology, University of California, Davis, CA, USASearch for more papers by this authorD. Rizzo, D. Rizzo Department of Plant Pathology, University of California, Davis, CA, USASearch for more papers by this authorE. Royce, E. Royce Department of Environmental Horticulture, University of California, Davis, CA 95616, USASearch for more papers by this authorJ. Fites-Kaufmann, J. Fites-Kaufmann USDA Forest Service, Nevada City, CA 95959, USA Department of Environmental Science and Policy, University of California, Davis, CA, USASearch for more papers by this author First published: 24 February 2002 https://doi.org/10.1111/j.1654-1103.2002.tb02073.xCitations: 53AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Abstract. We described 38 relictual old-growth stands – with data on the mortality, regeneration, floristic richness, fuel load and disease incidence in our study area in the Tahoe Basin of California and Nevada. The stands are within the lower and upper montane zones (1900–2400 m a.s.l.) and they are rare, occupying < 2% of the land in the Basin's watershed. Correlation matrices and ANOVAs of forest types and conifer species with environmental gradients revealed significant relationships with elevation, distance east of the Sierran crest, slope aspect, annual precipitation, date of complete snow melt, litter depth and degree of soil profile development. Pathogens, parasites and wood-boring insects were present on 23% of living trees; 16% of all trees were dead. We compared these stands to a reconstruction of pre-contact Basin forests and to ecologically analogous old-growth forests of Baja California that have never experienced fire suppression management. Currently, overstorey trees (> 180 yr old) in the Basin stands have ca. 33% cover, 54 m2.ha-1 basal area and 107 individuals.ha-1, values very similar to reconstructions of pre-contact Basin forests and to modern Baja California forests. Understorey trees (60–180 yr old), however, are several times more dense than historic levels and species composition is strongly dominated by A. concolor, regardless of the overstorey composition. The ratio of Pinus: Abies has increased – and the age structure of extant stands predicts that it will continue to increase – from approximately 1:1 in pre-contact time to 1:7 within the next century. Disease incidence and mortality in Baja forests were lower. Although we quantitatively defined current Basin old-growth forests – in terms of stand structure – we realize that our definition will differ from that of both past and future old-growth forests unless management protocols are changed. References Barbour, M.G. & Minnich, R.A. 1999. 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