Floristics and environmental relations in two extreme desert zones of western Egypt
MM Abd El‐Ghani - Global Ecology and Biogeography, 2000 - Wiley Online Library
Global Ecology and Biogeography, 2000•Wiley Online Library
Abstract 1 The present study provides quantitative estimates of soil, vegetation structure and
species distribution in 144 stands along two transects in two extreme desert zones of
western Egypt. This study had two aims:(1) to describe the floristic composition of the
accidental type of vegetation growing in parts of the Western Desert of Egypt; and (2) to
analyse the distribution of species in relation to certain environmental factors by multivariate
data analysis. 2 Eight environmental variables were recorded: salinity, pH, calcium …
species distribution in 144 stands along two transects in two extreme desert zones of
western Egypt. This study had two aims:(1) to describe the floristic composition of the
accidental type of vegetation growing in parts of the Western Desert of Egypt; and (2) to
analyse the distribution of species in relation to certain environmental factors by multivariate
data analysis. 2 Eight environmental variables were recorded: salinity, pH, calcium …
Abstract
- 1The present study provides quantitative estimates of soil, vegetation structure and species distribution in 144 stands along two transects in two extreme desert zones of western Egypt. This study had two aims: (1) to describe the floristic composition of the accidental type of vegetation growing in parts of the Western Desert of Egypt; and (2) to analyse the distribution of species in relation to certain environmental factors by multivariate data analysis.
- 2Eight environmental variables were recorded: salinity, pH, calcium carbonate, soil moisture, organic matter content, and percentages of sand, silt and clay. A total of 60 species belonging to 19 families of the angiosperms and Ephedra alata was recorded. Chamaephytes and therophytes were the most frequent, denoting a typical desert life‐form spectrum, mainly of Saharo‐Arabian distribution.
- 3The samples were classified into eight twinspan groups. Detrended correspondence analysis (DCA) showed that these groups could be distinguished by the first two DCA axes. They could also be effectively interpreted and explained with canonical correspondence analysis (CCA). Based on forward regression, salinity, fine sediments, organic matter and soil moisture content related closely to the first three canonical axes, and accounted for 84.1% of the species–environment relationship among the stands.
- 4Both classification and ordination resulted in a clear demonstration of the vegetation pattern in the study area. Other twinspan groups were characterized in addition to those identified previously. In conclusion, the study area has a transitional character where the Nubian Desert and the Northern Mediterranean vegetation meet.
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