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Mapping mortality following a long-term drought in a pinyon-juniper ecosystem in Arizona and New Mexico using Landsat data

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dc.contributor.advisor Cohen, Warren
dc.creator Kirschbaum, Alan A.
dc.date.accessioned 2008-06-23T22:18:17Z
dc.date.available 2008-06-23T22:18:17Z
dc.date.copyright 2008-06-13
dc.date.issued 2008-06-13
dc.identifier.uri http://hdl.handle.net/1957/8857
dc.description Graduation date: 2009 en_US
dc.description.abstract Protracted drought in the southwest U.S. has had significant impacts on the region’s keystone ecosystem, the pinyon-juniper (PJ) woodlands. Drought conditions in 9 of the last 10 years, exacerbated by extreme drought in one year, stressed the pinyon pine (Pinus edulis) trees, making them highly vulnerable to native ips beetles (Ips confusus). Current global climate predictions include further increases in temperatures and more extreme climatic events such as drought which will likely cause even more large-scale disturbances such as shifts in ecotones and increased insect outbreaks. This study investigated the utility of the Landsat satellite sensor for predicting percent dead tree cover in the PJ ecosystem in Arizona and New Mexico by relating field measurements of percent tree cover with Landsat spectral data. Direct change modeling and state model differencing (Healey et al. 2006)were compared in the two study areas in terms of RMSE for predicting percent dead cover. Direct change modeling outperformed state model differencing in both AZ and NM, with RMSEs of 4.2% and 7.3%, respectively. Landscape patterns were investigated in maps of dead cover made from the models. Consistent with expectations of the mechanism of the mortality, percent mortality on southwest aspects was higher than on northeast aspects. Percent dead cover model predictions were also validated with an independent data source (Forest Health Monitoring overflight data) in AZ and NM with overall agreement of 80 and 76%, respectively. en_US
dc.language.iso en_US en_US
dc.subject pinyon en_US
dc.subject Landsat en_US
dc.subject mortality en_US
dc.subject drought en_US
dc.subject Arizona en_US
dc.subject New Mexico en_US
dc.subject.lcsh Pinyon pines -- Effect of drought on -- Arizona -- Remote sensing en_US
dc.subject.lcsh Pinyon pines -- Effect of drought on -- New Mexico -- Remote sensing en_US
dc.subject.lcsh Junipers -- Effect of drought on -- Arizona -- Remote sensing en_US
dc.subject.lcsh Junipers -- Effect of drought on -- New Mexico -- Remote sensing en_US
dc.title Mapping mortality following a long-term drought in a pinyon-juniper ecosystem in Arizona and New Mexico using Landsat data en_US
dc.type Thesis en_US
dc.degree.name Master of Science (M.S.) in Forest Science en_US
dc.degree.level Master's en_US
dc.degree.discipline Forestry en_US
dc.degree.grantor Oregon State University en_US
dc.contributor.committeemember Petersen, Steven
dc.contributor.committeemember Kennedy, Robert
dc.contributor.committeemember Turner, David
dc.contributor.committeemember Skaugset, Arne


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