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Ecosystems

, Volume 15, Issue 1, pp 34–47 | Cite as

Spatiotemporal Patterns of Production Can Be Used to Detect State Change Across an Arid Landscape

  • Jeb C. WilliamsonEmail author
  • Brandon T. Bestelmeyer
  • Debra P. C. Peters
Article

Abstract

Methods to detect and quantify shifts in the state of ecosystems are increasingly important as global change drivers push more systems toward thresholds of change. Temporal relationships between precipitation and aboveground net primary production (ANPP) have been studied extensively in arid and semiarid ecosystems, but rarely has spatial variation in these relationships been investigated at a landscape scale, and rarely has such information been viewed as a resource for mapping the distribution of different ecological states. We examined the broad-scale effects of a shift from grassland to shrubland states on spatiotemporal patterns of remotely sensed ANPP proxies in the northern Chihuahuan Desert. We found that the normalized difference vegetation index (NDVI), when averaged across an eight-year period, did not vary significantly between these states, despite changes in ecosystem attributes likely to influence water availability to plants. In contrast, temporal relationships between precipitation and time-integrated NDVI (NDVI-I) modeled on a per-pixel basis were sensitive to spatial variation in shrub canopy cover, a key attribute differentiating ecological states in the region. The slope of the relationship between annual NDVI-I and 2-year cumulative precipitation was negatively related to, and accounted for 71% of variation in, shrub canopy cover estimated at validation sites using high spatial resolution satellite imagery. These results suggest that remote sensing studies of temporal precipitation–NDVI relationships may be useful for deriving shrub canopy cover estimates in the region, as well as for mapping other ecological state changes characterized by shifts in long-term ANPP, plant functional type dominance, or both.

Keywords

aboveground net primary production normalized difference vegetation index precipitation remote sensing Chihuahuan Desert state change shrub encroachment grassland shrubland 

Notes

Acknowledgments

We would like to thank José Paruelo and two anonymous reviewers for helpful comments on this manuscript. This study was funded by the USDA Rangeland Research Program (2007-38415-18637) and the USDA-NRI Biology of Weedy and Invasive Species program (2008-35320-18684). Funding support was also provided by the National Science Foundation to New Mexico State University as part of the Jornada Basin Long Term Ecological Research Program (DEB-0618210).

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Copyright information

© Springer Science+Business Media, LLC (outside the USA) 2011

Authors and Affiliations

  • Jeb C. Williamson
    • 1
    Email author
  • Brandon T. Bestelmeyer
    • 1
  • Debra P. C. Peters
    • 1
  1. 1.USDA-ARS Jornada Experimental RangeNew Mexico State UniversityLas CrucesUSA

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