Volume 3, Issue 6, December 2014, Page: 137-146
Vegetative Response to Climate Change in the Big Pine Creek Watershed along a 2,500 Meter Elevation Gradient Using Landsat Data
Patrick Shawn Sawyer, School of Environmental and Public Affairs, University of Nevada, Las Vegas, United States
Haroon Stephen, Department of Civil and Environmental Engineering and Construction, University of Nevada, Las Vegas, United States
Received: Dec. 16, 2014;       Accepted: Dec. 29, 2014;       Published: Jan. 6, 2015
DOI: 10.11648/j.earth.20140306.12      View  2120      Downloads  93
Abstract
This paper presents a time series study of an alpine ecosystem in the Big Pine Creek watershed in California’s Eastern Sierra Nevada Mountain’s. Seventy five sample sites along a 2,500 meter elevation gradient are analyzed for trends in surface reflectance based on vegetative density using USGS data derived from Landsat imagery for the 1984 through 2013 time frame. Three vegetative indices, NDVI, SAVI, and MSAVI2 as well as the Tasseled Cap transformations for Brightness (TCB), greenness (TCG), and wetness (TCW) are explored. We found that over the time period of the study, significant increases in vegetation are occurring at densely vegetated sites at almost all elevations within the watershed while less change and even some significant declines in vegetation are seen in moderately and sparsely vegetated sites. Sparsely vegetated sites show distinct bifurcation in their response with the lower elevations seeing declines and the upper elevations seeing increases in vegetation. Several sites show significant declines in both the visible and near infrared regions suggesting there are compositional changes taking place consistent with climate induced range shifts. This study provides a useful insight into the ecological response of the Big Pine Creek watershed to recent climate change.
Keywords
Landsat, Vegetation Indices, Elevation Gradient, Alpine Watershed, Climate Change, Time Series Mann-Kendall Trend Analysis
To cite this article
Patrick Shawn Sawyer, Haroon Stephen, Vegetative Response to Climate Change in the Big Pine Creek Watershed along a 2,500 Meter Elevation Gradient Using Landsat Data, Earth Sciences. Vol. 3, No. 6, 2014, pp. 137-146. doi: 10.11648/j.earth.20140306.12
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