<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>32</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Ryerson, Daniel E.</style></author></authors><tertiary-authors><author><style face="normal" font="default" size="100%">Swetnam, T.</style></author></tertiary-authors></contributors><titles><title><style face="normal" font="default" size="100%">Tree-Ring Reconstruction of Western Spruce Budworm Outbreaks in the Rio Grande National Forest, Colorado</style></title><secondary-title><style face="normal" font="default" size="100%">School of Renewable Natural Resources</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">colorado</style></keyword><keyword><style  face="normal" font="default" size="100%">dendrochronology</style></keyword><keyword><style  face="normal" font="default" size="100%">department of agriculture</style></keyword><keyword><style  face="normal" font="default" size="100%">forest service</style></keyword><keyword><style  face="normal" font="default" size="100%">national forest</style></keyword><keyword><style  face="normal" font="default" size="100%">outbreak</style></keyword><keyword><style  face="normal" font="default" size="100%">palmer drought severity index</style></keyword><keyword><style  face="normal" font="default" size="100%">RGNF</style></keyword><keyword><style  face="normal" font="default" size="100%">rio grande</style></keyword><keyword><style  face="normal" font="default" size="100%">tree ring</style></keyword><keyword><style  face="normal" font="default" size="100%">western spruce budworm</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1999</style></year></dates><publisher><style face="normal" font="default" size="100%">University of Arizona</style></publisher><pub-location><style face="normal" font="default" size="100%">Tucson</style></pub-location><volume><style face="normal" font="default" size="100%">Master of Science</style></volume><pages><style face="normal" font="default" size="100%">97</style></pages><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;&amp;nbsp;&lt;/p&gt;&lt;p&gt;Tree-ring records were used to reconstruct the spatial and temporal patterns of western spruce budworm (Choristoneura occidentalis Freeman) outbreaks in the Rio Grande National Forest (RGNF) of southern Colorado. Reconstructions at 11 host stands showed a synchronous pattern of outbreaks with a peak in the number of trees recording outbreaks over the entire RGNF on average every 24 years. These synchronous periods of outbreaks coincided with periods of increased moisture as indicated by an independently reconstructed summer Palmer Drought Severity Index, while relatively few trees recorded outbreaks during dry periods. The reconstruction on the RGNF does not support the hypothesis that human land use has significantly altered outbreak patterns. Tree response to outbreaks in the RGNF was different from prior studies as reductions in the growth were typically detectable only when growth was compared to that of nonhost tree species.&lt;/p&gt;</style></abstract></record></records></xml>