Three-dimensional woody vegetation structure across different land-use types and -land-use intensities in a semi-arid savanna

Jolene Fisher, B. F.N. Erasmus, Ed Witkowski, Jan Van Aardt, Greg Asner, Ty Kennedy-Bowdoin, Dave Knapp, Renaud Mathieu, Konrad Wessels

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

Factors influencing woody savanna vegetation structure across a land-use gradient of intensity (highly and lightly utilized communal rangeland) and type (national protected area, private game reserve and communal rangelands) were investigated. Small-footprint discrete return LiDAR data (1.12 m point spacing) from the Carnegie Airborne Observatory (CAO) 'Alpha system' were used to measure three-dimensional vegetation structure across the different treatments. A volumetric pixel (voxel) approach was used to characterise the vertical distribution of LiDAR returns, i.e., vegetation density, in one metre increments for comparison using descriptive statistics across the land-use type and intensity gradient. Vegetation structure in the national protected area was most similar to the lightly utilized rangelands, and the private game reserve was most similar to the highly utilized rangelands with low levels of structural diversity present. Current trends in structural diversity can be related to harvesting, regeneration, herbivory and fire.

Original languageEnglish (US)
Title of host publication2009 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2009 - Proceedings
PagesII198-II201
DOIs
StatePublished - 2009
Externally publishedYes
Event2009 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2009 - Cape Town, South Africa
Duration: Jul 12 2009Jul 17 2009

Publication series

NameInternational Geoscience and Remote Sensing Symposium (IGARSS)
Volume2

Other

Other2009 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2009
CountrySouth Africa
CityCape Town
Period7/12/097/17/09

Keywords

  • 3-D vegetation profile
  • Land-use
  • LiDAR
  • Protected areas
  • Rangelands
  • Vegetation density

ASJC Scopus subject areas

  • Computer Science Applications
  • Earth and Planetary Sciences(all)

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    Fisher, J., Erasmus, B. F. N., Witkowski, E., Van Aardt, J., Asner, G., Kennedy-Bowdoin, T., Knapp, D., Mathieu, R., & Wessels, K. (2009). Three-dimensional woody vegetation structure across different land-use types and -land-use intensities in a semi-arid savanna. In 2009 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2009 - Proceedings (pp. II198-II201). [5418040] (International Geoscience and Remote Sensing Symposium (IGARSS); Vol. 2). https://doi.org/10.1109/IGARSS.2009.5418040