WIKINDX Resources
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Bradley, B. A., & Mustard, J. F. (2005). Identifying land cover variability distinct from land cover change: cheatgrass in the great basin. Remote Sensing of Environment, 94, 204–213.
Added by: Eric Peterson 2007-10-09 17:21:51
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Categories: General
Keywords: Land use/land cover change; Great Basin; Cheatgrass; Bromus tectorum; Invasive species; Time series; NDVI; Inter-annual variability
Creators: Bradley, Mustard
Collection: Remote Sensing of Environment
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Number of views: 150
Popularity index: 98.04%
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Abstract
An understanding of land use/land cover change at local, regional, and global scales is important in an increasingly human-dominated
biosphere. Here, we report on an under-appreciated complexity in the analysis of land cover change important in arid and semi-arid
environments. In these environments, some land cover types show a high degree of inter-annual variability in productivity. In this study, we
show that ecosystems dominated by non-native cheatgrass (Bromus tectorum) show an inter-annual amplified response to rainfall distinct
from native shrub/bunch grass in the Great Basin, US. This response is apparent in time series of Landsat and Advanced Very High
Resolution Radiometer (AVHRR) that encompass enough time to include years with high and low rainfall. Based on areas showing a similar
amplified response elsewhere in the Great Basin, 20,000 km2, or 7% of land cover, are currently dominated by cheatgrass. Inter-annual
patterns, like the high variability seen in cheatgrass-dominated areas, should be considered for more accurate land cover classification. Land
cover change science should be aware that high inter-annual variability is inherent in annual dominated ecosystems and does not necessarily
correspond to active land cover change.
Added by: Eric Peterson
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