Impact of a severe frost event in 2014 on woody vegetation within the Nama-Karoo and semi-arid savanna biomes of South Africa
作者： Kayleigh Muller , Timothy Gordon O’Connor , Johannes Robert Henschel
DOI: 10.1016/J.JARIDENV.2016.06.010
关键词: Geography 、 Abundance (ecology) 、 Drainage 、 Acacia 、 Frost 、 Vegetation 、 Canopy 、 Ecology 、 Arid 、 Biome
摘要: Abstract The plains of the Nama-Karoo biome in southern Africa are characterised by a mixture dwarf shrubs and grasses with near absence trees that conspicuous adjacent savanna on hills. We investigated impact severe frost event 2014 abundance composition woody vegetation relation to local topography at three widely separated locations. Long-term weather records 44, 53, 83 years confirmed was 16th, 6th, 12th percentile cold across An similar severity had not occurred for >7 years at locations but location. Woody lost 60–100% canopy volume base slope no loss elevations 30–100 m above this. Regrowth after one season linearly related although most plants recovered pre-frost volume. All dominant species experienced substantial topkill. Microphyllous appeared particularly sensitive frost. Results suggest contributes maintaining treeless character containing bush encroachment along drainage lines within biome.
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