• Effects Of Dwarf Mistletoe On Climate Response Of Mature Ponderosa Pine Trees

      Stanton, Sharon; Department of Biology, Portland State University (Tree-Ring Society, 2007-12)
      This research examines the influence of western dwarf mistletoe (Arceuthobium campylopodum) infection on the radial growth response of mature ponderosa pines (Pinus ponderosa) and its effects on dendroclimatic reconstructions. I hypothesize that trees with mistletoe have lower annual growth rates than uninfected trees, but exhibit higher mean sensitivities and stronger relationships between growth and climate variation. I tested these hypotheses using correlation and regression analyses to compare 100-year crossdated and standardized tree-ring chronologies from 26 infected and 29 uninfected trees. I compared both chronologies to climate variation as measured by changes in total precipitation, minimum, mean, and maximum temperature, and the Palmer Drought Severity Index (PDSI). Results show that trees infected with dwarf mistletoe have higher radial growth rates, exhibit greater sensitivity, and respond more strongly to climate variation. Both infected and uninfected chronologies are significantly correlated with the respective climate variables, but exhibit different patterns. The strongest correlations are between infected trees and PDSI for all months tested; significant correlations between uninfected trees and PDSI are limited to May through December lagged from the previous year. These results suggest mistletoe-infected trees are more sensitive to climatic factors than uninfected trees and may be useful for dendroclimatic analyses.
    • In Memoriam- Bernhard Denneler (1963-2007)

      Bergeron, Yves; Tree-Ring Society (Tree-Ring Society, 2007-06)
    • A Modified Increment Borer Handle For Coring In Locations With Obstruction

      Brown, Peter M.; Rocky Mountain Tree-Ring Research, Inc. (Tree-Ring Society, 2007-06)
      A simple modification to a standard increment borer handle is described that enhances use of the borer in situations where obstructions to the rotation of a normal handle prevents utilization of the full length of the borer. The modification, informally called the ‘‘Quad-B’’ (Brown’s bent boomerang borer handle), involves bending both sides of the handle to ~35–40° angles. Some potential uses of the modified handle are described.
    • The Potential To Reconstruct Manasi River Streamflow In The Northern Tien Shan Mountains (NW China)

      Yuan, Yujiang; Shao, Xuemei; Wei, Wenshou; Yu, Shulong; Gong, Yuan; Trouet, Valerie; Institute of Desert Meteorology, CMA, Urumqi 830002, China; Swiss Federal Research Institute WSL, 8903 Birmensdorf, Switzerland; Institute of Geographical Sciences and Resources, CAS, Beijing 100101, China; Hydrological and Water Resources Bureau of Xinjiang, Urumqi 830000, China (Tree-Ring Society, 2007-12)
      We present a tree-ring based reconstruction of water-year (October–September) streamflow for the Manasi River in the northern Tien Shan mountains in northwestern China. We developed eight Tien Shan spruce (Picea schrenkiana Fisch. et Mey.) chronologies for this purpose, which showed a common climatic signal. The hydroclimatic forcing driving tree growth variability affected streamflow with a three- to four-year lag. The model used to estimate streamflow is based on the average of three chronologies and reflects the autoregressive structure of the streamflow time series. The model explains 51% of variance in the instrumental data and allowed us to reconstruct streamflow for the period 1629–2000. This preliminary reconstruction could serve as a basis for providing a longer context for evaluating the recent (1995–2000) increasing trends in Manasi River streamflow and enables the detection of sustained periods of drought and flood, which are particularly challenging for managing water systems. Several of the reconstructed extended dry (wet) periods of the Manasi River correspond to reconstructed periods of drought (flood) in Central Asia in general and in other Tien Shan mountain locations in particular, suggesting that the analysis of Tien Shan spruce could contribute significantly to the development of regionally explicit streamflow reconstructions.
    • Tree-Ring Based Drought Reconstruction (A.D. 1855-2001) For The Qilian Mountains, Northwestern China

      Tian, Qinhua; Gou, Xiaohua; Zhang, Yong; Peng, Jianfeng; Wang, Jinsong; Chen, Tuo; Center for Arid Environment and Paleoclimate Research (CAEP), Key Laboratory of Western China’s Environment Systems MOE, Lanzhou University, Lanzhou, 730000, China; Graduate School of the Chinese Academy of Sciences, Beijing 100039, China; Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; The State Key Laboratory of Loess and Quaternary Geology, The Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China (Tree-Ring Society, 2007-06)
      A juniper (Juniperus przewalskii Kom) tree-ring width chronology has been developed from the western-most forest of the Qilian Mountains. Our analyses demonstrate both temperature and precipitation have significant effects on tree growth and that both should be considered in climate reconstruction. Thus a regional drought history (A.D. 1855–2001) is reconstructed by calibrating with a linear interpolation through four Palmer Drought Severity Index (PDSI) grid values nearest the sampling site. Our reconstruction extends the drought history of this area and also reveals that the most severe drought occurred in the 1920s. In the context of the drought history of western China, this extreme drought between 1925–1931 is consistent over a large surrounding region of Northwestern China. Multi-taper spectral analysis reveals the existence of significant 40- to 46-year, 29-year, and 2.1- to 3-year periods of variability. Overall, our study provides reliable information for the research of past drought variability in the Qilian Mountains, Northwestern China.
    • Tree-Ring Dating of Sinmu-Mun, The North Gate of Kyungbok Palace in Seoul

      Park, Won-Kyu; Kim, Yo-Jung; Seo, Jung-Wook; Lee, Jin-Ho; Wazny, Tomasz; School of Forest Resources, Chungbuk National University; Institute for the Study, Conservation and Restoration of Cultural Heritage, Nicholas Copernicus University of Torun (Tree-Ring Society, 2007-12)
      The cutting dates of 10 wood timbers (girders and corner rafters) of Sinmu-mun, the north gate of Kyungbok Palace in Seoul, were determined by the dendrochronological method. Tree-ring chronologies of unknown dates derived from the timbers were crossdated using the graphic comparison method against the dated master chronologies derived from living trees. The living trees for the masters used for this study were Pinus densiflora Sieb. et Zucc. (Japanese red pine), a major timber species for Korean traditional buildings. By comparing the Sinmu-mun samples with the masters from the western Sorak Mountains in central-eastern Korea, the Sinmu-mun samples yielded the cutting dates A.D. 1868, 1869, and 1870/1871. Surprisingly, these dates are 3 to 6 year later than the known date (A.D. 1865) of the Sinmu-mun reconstruction, which was recorded in a historical document ‘Ilsungrok’, the King’s official diary. Since the time that the Sinmu-mun construction date had been questioned, another record was found in the 1872 April issue of Ilsungrok, indicating the rebuilding of Sinmu-mun in the 1870s. Both pieces of evidence, from tree-ring dates and historic records, prove that the rebuilding of Sinmu-mun started after the Fall of 1870, but not later than April 1872. The results prove that tree-ring dating is a precise dating method and it can be applied to archaeological studies on Korean structures.
    • Tree-Ring-Derived Precipitation Records From Inner Mongolia, China, Since A.D. 1627

      Liu, Yu; Sun, Junyan; Yang, Yinke; Cai, Qiufang; Song, Huiming; Shi, Jiangfeng; An, Zhisheng; Li, Xuxiang; The State Key Laboratory of Loess and Quaternary Geology, The Institute of Earth Environment, Chinese Academy of Sciences Xi’an 710075, China; Department of Environment Engineering, School of Energy and Power Engineering of Xi’an Jiaotong University; et al. (Tree-Ring Society, 2007-06)
      Two Chinese pine (Pinus tabulaeformis) tree-ring width chronologies up to 375 years long were used to reconstruct rainfall from February to early July for the Wu Dangzhao region and from February to mid-July for the La Madong region, Inner Mongolia, China. The predictor variables account for 44.3% and 42.7% of the variance in precipitation, respectively. Both historical records and two other tree-ring based precipitation reconstructions from the environmentally sensitive zone (the northern Helan Mountain range and Baiyinaobao) confirm our results. After applying a 10-year moving average, the trends of four tree-ring based precipitation reconstructions vary synchronously. Periods with below-normal precipitation occurred during the 1720s–1730s, 1740s–1750s, 1790s, early 1810s, late 1830s–1860s, 1880s–1910s, late 1920s–1930s and after the late 1960s–early 1970s. Periods with above-normal precipitation occurred in the 1760s to early 1770s, 1820s to early 1830s, 1870s–1880s, early 1920s, 1940s to early 1960s, and 1990s. The late 1920s period was the most severe drought over a broad area in north China in the last 375 years. In contrast, the wettest period was in the late 1990s.