Canopy phenology of some mopane and miombo woodlands in eastern Zambia

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

Measurements of tree canopy closure and field-layer reflectance were made in a series of plots in protected areas of eastern Zambia as part of a multiyear study of savanna woodlands. The plots were located in the Luangwa Valley and adjacent plateaux, which contained a range of vegetation types found in southern Africa. The vegetation consisted of four broad types: 1. plateau miombo woodland; 2. valley miombo woodland; 3. scrub miombo woodland; and 4. scrub and woodland mopane. Hemispherical photographs of the tree layer provided measurements of tree canopy phenology in the different vegetation plots. The most seasonal woodland type was mopane, where tree canopy closure ranged from about 15% at the end of the dry season to just over 60% during the peak of the rains. Plateau miombo exhibited the lowest range of seasonality in the tree layer, ranging from about 40% to 60% closure over one complete seasonal cycle. Phenology of the field layer, expressed as the normalized difference vegetation index (NDVI), closely followed that of the tree layer, although the field layer senesced earlier than trees, especially in plots with relatively low tree canopy closure. The relationship between tree-canopy closure and field-layer NDVI was positive and statistically significant for all sites of the study area, which suggests that woody biomass and herbaceous biomass are related positively in these savanna woodland ecosystems.

Original languageEnglish (US)
Pages (from-to)199-209
Number of pages11
JournalGlobal Ecology and Biogeography
Volume8
Issue number3-4
DOIs
StatePublished - 1999

Keywords

  • Canopy phenology
  • Hemispherical photography
  • Luangwa Valley
  • Miombo woodland
  • Mopane woodland
  • NDVL
  • Tree-grass interactions
  • Zambezian woodlands

ASJC Scopus subject areas

  • Global and Planetary Change
  • Ecology, Evolution, Behavior and Systematics
  • Ecology

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