A Note on the Effect of Burning on Soil Seed Bank, Vegetation Cover and Productivity in the Rangeland of Um Kaddada, North Darfour State, Sudan
A study was conducted during the rainy season of 2009 at Um
Kaddada locality, North Darfour State, Sudan to investigate the effect of
burning on the soil seed bank and performance of vegetation in
rangelands. Two homogeneous areas were selected; one was burned late
in the dry season and the second was not burned. Soil samples were
collected from an area of 10 cm x 10 cm from a depth of 0-10 cm at 25 m
intervals along a 100 m transect and saved in plastic bags for seed
extraction. Live seeds were identified visually and confirmed by
germination in the nursery and counted for each species. Five transects
100 m long were randomly selected in each area and vegetation cover and
forage productivity were determined at 20 m interval in each transect. Ttest
was used for testing the impact of burning on the soil seed bank and
descriptive statistic was used for vegetation cover and forage productivity.
Seeds in the soil seed bank in the unburned site were significantly higher
than in the burned site. With the exception of Tribulus terristris, the
number of live seeds in the soil seed bank was reduced in the burned site
by 9, 25, 30, 42, 46 and 60% for (Haskaneit), Aristida adscensions (Gau),
Dactyloctenium aegyptium (Abu asabie), Euphorbia aegyptiaca (Um
albana), Echincloa colonum (Difra), and Eragrostis tremula (Bano),
respectively, compared to the unburned site. Plant cover and forage
productivity were lower in the burned site compared to the unburned sites.
The study concluded that soil seed bank, vegetation cover and forage
productivity were negatively affected by burning.
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