JSM 2004 - Toronto

Abstract #301244

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Activity Number: 217
Type: Topic Contributed
Date/Time: Tuesday, August 10, 2004 : 10:30 AM to 12:20 PM
Sponsor: Section on Bayesian Statistical Science
Abstract - #301244
Title: Spatial Variation in Soil Nitrate and Carbon Levels in Metropolitan Phoenix and the Surrounding Deserts
Author(s): Jacob J. Oleson*+
Companies: Arizona State University
Address: Department of Mathematics & Statistics, Tempe, AZ, 85287-1804,
Keywords: linear mixed model ; MCMC ; LTER ; spatial correlation ; Bayesian
Abstract:

Cities provide unique opportunities for integrating humans into ecology. Using data from an integrated inventory of metropolitan Phoenix, Arizona, we explore the contribution of human-related variables to explaining observed variation in soil nitrate-N and total carbon across the city, agricultural fields, surrounding desert, and mixed regions. The spatial relationships for carbon and soil nitrate may be different in each of these regions. In estimating their levels, we take into account differing spatial patterns in each region and use additional covariate information as well. Soil nitrate shows markedly greater spatial autocorrelation in the desert regions, while the carbon levels show varying amounts of spatial relationships in the different regions.

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