Predicting spatial distribution of white locoweed (Oxytropis sericea) in the Maxwell Ranch, Larimer County, Colorado
2003
Fujisawa, H. (Colorado State Univ., Fort Collins (USA)) | Reich, R.M.
Synopsis FUJISAWA, H. and R.M. REICH (2003) : Predicting spatial distribution of white locoweed (Oxytropis sericea) in the Maxwell Ranch, Larimer County, Colorado. Grassland Science 49, 421-424. In semi-arid rangeland in the western U.S., there is a need to manage locoweed (Oxytropis species) populations because of its toxicity to livestock. We used statistical techniques, along with general linear models (GLM) incorporated into a Geographic Information System (GIS) along with remotely sensed data and soil data to predict the probability of observing white locoweed (Oxytropis sericea) in the Maxwell Ranch, Larimer County, Colorado. In the summer of 1999 and 2000, the presence/absence of white locoweed along with Universal Transverse Mercator (UTM) coordinates were collected in the Maxwell Ranch. Stepwise regression was used to select significant variables, such as slope, Landsat 7 band 1, 3, 6 and tasseled cap layer 1, available water content, and organic matter content to include in the model. The overall accuracy of the model to predict the presence/absence of white locoweed was 86%. Logistic regression equations were used to calculate probabilities of observing white locoweed in the study site.
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