<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>27</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">LaMarche, Valmore C.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Tree-Ring Growth in High-Altitude Bristlecone Pine as Related to Meteorological Factors: Research Proposal</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">bristlecone pine</style></keyword><keyword><style  face="normal" font="default" size="100%">cold sensitive</style></keyword><keyword><style  face="normal" font="default" size="100%">dendroclimatology</style></keyword><keyword><style  face="normal" font="default" size="100%">drought sensitive</style></keyword><keyword><style  face="normal" font="default" size="100%">high altitude</style></keyword><keyword><style  face="normal" font="default" size="100%">meteorological</style></keyword><keyword><style  face="normal" font="default" size="100%">NSF</style></keyword><keyword><style  face="normal" font="default" size="100%">pinus aristata</style></keyword><keyword><style  face="normal" font="default" size="100%">precipitation</style></keyword><keyword><style  face="normal" font="default" size="100%">temperature</style></keyword><keyword><style  face="normal" font="default" size="100%">tree ring</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1968</style></year></dates><publisher><style face="normal" font="default" size="100%">Laboratory of Tree-Ring Research</style></publisher><pub-location><style face="normal" font="default" size="100%">Tucson</style></pub-location><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Important climatic information may be contained in long tree-ring records from the upper treeline of mid-latitude mountains. Preliminary work and the results of related research suggest that the variation in annual ring-width series from bristlecone pine (P. aristata) at the upper treeline is related to year-to-year differences in the temperature regime, in contrast to the &amp;quot;drought sensitivity&amp;quot; of this species near the lower forest border. Therefore, the establishment of a quantitative relationship between meterological factors and tree-ring growth at the upper treeline may permit the extension of temperature records, ad would provide an additional tool for evaluating certain environmental characteristics of remote, high-mountain regions. Direct comparison of tree-ring chronologies from &amp;quot;drought-sensitive&amp;quot; conifers at the lower forest border with those from &amp;quot;cold-sensitive&amp;quot; trees at the nearby upper treeline might also lead to the separation of precipitation and temperature effects in paleoclimatic reconstruction.&lt;/p&gt;&lt;p&gt;The basic approach involves the empirical comparison of tree-ring chronologies with concurrent meteorological time series in a few areas in the western United States, selected for the proximity of a bristlecone pine treeline to one or more high altitude weather stations. A number of replicated tree-ring samples will be dated, measured, standardized, and evaluated to form the basic tree-ring chronologies. testing the association between the ring-widths and meteorological factors will proceed through the development of progressively refined empirical models. Consistency with available biological data will serve as a general guide in the development of a meaningful model.&lt;/p&gt;</style></abstract><work-type><style face="normal" font="default" size="100%">Research Proposal</style></work-type></record></records></xml>