• In Memoriam- Austin Long (1936–2010)

      Eastoe, Chris; Leavitt, Steven W. (Tree-Ring Society, 2011-01)
    • Incorporating Climatological Techniques To Improve Tree-Ring Site Selection In Complex Terrain

      Wise, Erika K.; Department of Geography, University of North Carolina at Chapel Hill (Tree-Ring Society, 2011-01)
      Dendroclimatologists often approach field work with the intent of reconstructing a particular climate variable (e.g. temperature, streamflow, precipitation). Although guidelines exist for species and site selection, isolating the signal of interest is difficult in areas with complex terrain or a lack of ideal sites. In this case study, I suggest climatological techniques for a more efficient sampling scheme and apply these techniques to identify criteria for selecting sites sensitive to winter precipitation in the north-central Rocky Mountains. These techniques include examining factors influencing the regional response of tree growth to climate by utilizing the International Tree-Ring Databank (ITRDB), using eigenvector analyses to identify modes of variability between sites, and delineating climate regions based on the variable of interest through climate regionalization. Results suggest that low- or mid-elevation Pseudotsuga menziesii sites should be targeted for maximizing the winter precipitation signal in the case study area. The season of precipitation impacting growth was found to be a major component of the overall variability between sites.
    • Potential For Developing Fire Histories In Chir Pine (Pinus Roxburghii) Forest In The Himalayan Foothills

      Brown, Peter M.; Bhattacharyya, Amalava; Shah, Santosh K.; Rocky Mountain Tree-Ring Research, 2901 Moore Lane, Fort Collins, CO 80526, USA; Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow, 226 007, India (Tree-Ring Society, 2011-01)
      We report on the potential for developing long-term fire histories from chir pine (Pinus roxburghii Sarg.) forests in the Western Himalayan foothills based on a preliminary study from a stand located in the state of Uttarakhand in northern India. Rings from trees collected to develop a master skeleton plot chronology were generally complacent with false rings present during most years, but were crossdatable with only minor difficulty. The oldest tree confidently crossdated back to 1886, with good sample depth (5 trees) from 1911, which helped date the fire scars in cross-sections collected from three trees. Fire frequency as determined from fire-scar dates was high, with mean and median fire intervals of 3 years from 1938 to 2006. Fires were likely from human ignitions given the prevalence of human land use in the site. Fire scars were generally recorded at false-ring boundaries and likely represent burning during the hot, dry period in May or early June before the onset of monsoon rainfall beginning in mid-June. Although only three fire-scarred trees were sampled, this preliminary assessment shows there is a potential for additional samples from other stands to develop longer-term fire histories to better understand the role of fire in the ecology and management of chir pine throughout its range in the Himalaya region.
    • Reconstructing Population Dynamics Of Yellow-Cedar In Declining Stands: Baseline Information From Tree Rings

      Stan, Amanda B.; Maertens, Thomas B.; Daniels, Lori D.; Zeglen, Stefan; Department of Geography, University of British Columbia; British Columbia Ministry of Forests and Range, Nanaimo, British Columbia V9T 6E9, Canada (Tree-Ring Society, 2011-01)
      Yellow-cedar (Chamaecyparis nootkatensis (D. Don) Spach) forests of coastal British Columbia are apparently experiencing decline in a manner similar to that observed in southeastern Alaska. In this pilot study, we collect tree-ring data from live and standing dead yellow-cedar trees from four declining sites on the North Coast of British Columbia. We use this data to compare growth patterns at our sites to those of yellow-cedar trees at non-declining and declining sites in southwestern British Columbia and southeastern Alaska and, in addition, to assess the possibility of reconstructing yellow-cedar population dynamics in declining stands using dendrochronology. We found coherent growth patterns (i.e. marker years and periods of suppression) among yellow-cedar chronologies from non-declining and declining sites across a broad geographic range as well as unique growth patterns between our chronologies from declining sites and those from declining sites in nearby Alaska. Using outer-ring dates of increment cores, we were able to estimate time since death of decade- to century-old standing dead yellow-cedar trees, although the precision of the estimates was influenced by partial cambial mortality and erosion of outer rings. Our results provide baseline dendrochronological information that will be useful for planning future studies that assess growth-climate relations and reconstruct the long-term population dynamics of yellow-cedar in declining stands.
    • Scientific Advisory-- Expanded Application Of Dendrochronology Collections: Collect And Save Exudates

      Santiago-Blay, Jorge A.; Lambert, Joseph B.; Creasman, Pearce Paul; Department of Paleobiology, MRC-121, National Museum of Natural History, Smithsonian Institution; Department of Chemistry, Trinity University; Department of Chemistry, Northwestern University; Laboratory of Tree-Ring Research, University of Arizona (Tree-Ring Society, 2011-01)
    • Software Review Autobox And Its Use In Dendroecology

      Rauchfuss, Julia; Mid Sweden University, Department of Natural Sciences, Engineering and Mathematics (Tree-Ring Society, 2011-01)