Woody and Herbaceous Vegetation Change across the Savannas of West Africa, 1982-2013

Description

The WAVeTrends dataset is a 0.05 degree (5.55 km) vegetation change product, spanning the West African Sudano-Sahel region. It provides pixel-wise information on concurrent woody and herbaceous vegetation trends over a 32-year period (1982-2013). Change in woody vegetation was derived using long-term rain use efficiency (RUE) sensitivity, i.e., the per-pixel comparison of the difference of mean RUE between the first and last decades of the 32-year time series. Herbaceous vegetation change was defined by short-term RUE sensitivity, i.e., comparing the slope of the RUE relationship (productivity vs. precipitation) between both decades using per-pixel Analysis of Covariance (ANCOVA). Categorical vegetation change was then determined for each pixel using the direction of the change and a significance level of p<0.05. The use of RUE (the amount of biomass produced per unit of precipitation) for vegetation trend analysis in savanna regions relies on the assumption that rainfall is a significant positive driver of net production in drylands. Testing of this long-term productivity-rainfall relationship revealed that the assumption was not always met, therefore, validity flags are included for each pixel location.

Resources

Name Format Description Link
21 Search results for publications that cite this dataset by its DOI. https://scholar.google.com/scholar?q=10.3334%2FORNLDAAC%2F1738
21 ORNL DAAC Data Set Documentation https://daac.ornl.gov/VEGETATION/guides/WAVeTrends.html
21 Data set Landing Page DOI URL https://doi.org/10.3334/ORNLDAAC/1738
33 West African Vegetation Trends (WAVeTrends): WAVeTrends.pdf https://data.ornldaac.earthdata.nasa.gov/public/global_vegetation/WAVeTrends/comp/WAVeTrends.pdf
33 West African Vegetation Trends (WAVeTrends): WAVeTrends_classify.pdf https://data.ornldaac.earthdata.nasa.gov/public/global_vegetation/WAVeTrends/comp/WAVeTrends_classify.pdf
34 Concurrent woody and herbaceous vegetation changes between the 1982-1991 and 2004-2013 decades of the Sudano-Sahel region of Africa. (A) Map of vegetation change categories. (B) Chart showing the conceptual position and the relative abundance of each category in a 2-D space (Anchang et al. 2019). https://daac.ornl.gov/VEGETATION/guides/WAVeTrends_Fig1.png
21 This link allows direct data access via Earthdata login https://daac.ornl.gov/daacdata/global_vegetation/WAVeTrends/

Tags

  • precipitation
  • habitat-conversion-fragmentation
  • ecosystems
  • biosphere
  • human-dimensions
  • atmosphere
  • vegetation
  • ecological-dynamics
  • earth-science

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