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Titolo:
Climate and phenology of savanna vegetation in southern Africa
Autore:
Chidumayo, EN;
Indirizzi:
Univ Zambia, Dept Biol Sci, Lusaka, Zambia Univ Zambia Lusaka ZambiaUniv Zambia, Dept Biol Sci, Lusaka, Zambia
Titolo Testata:
JOURNAL OF VEGETATION SCIENCE
fascicolo: 3, volume: 12, anno: 2001,
pagine: 347 - 354
SICI:
1100-9233(200106)12:3<347:CAPOSV>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
HERBACEOUS VEGETATION; MIOMBO WOODLAND; SHOOT GROWTH; BOTSWANA; TREES; VARIABILITY; RANGELANDS; ZAMBIA; FIRE;
Keywords:
Botswana; cluster analysis; plant growth; normalized difference vegetation index; tree and grass components; Zambia;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Chidumayo, EN Univ Zambia, Dept Biol Sci, POB 32379, Lusaka, Zambia Univ Zambia POB 32379 Lusaka Zambia 32379, Lusaka, Zambia
Citazione:
E.N. Chidumayo, "Climate and phenology of savanna vegetation in southern Africa", J VEG SCI, 12(3), 2001, pp. 347-354

Abstract

This paper discusses the relationship of vegetation phenology and three climate variables (rainfall, minimum and maximum temperature) at 17 savanna sites in Botswana and Zambia. Interactions among climate variables were responsible for the largest variation in vegetation canopy phenology measured by the Normalized Difference Vegetation Index (NDVI) and tree shoot extension from ground observations. The most important determinant of savanna phenology in southern Africa was the interaction between minimum and maximum temperature. This observation indicates the need to incorporate minimum and Maximum temperature in modelling the impact of climate change on savanna vegetation. Cluster analysis, using five NDVI metrics, separated the study sites into four savanna types with distinct tree:grass ratios. The semi-arid sites were characterized by a co-dominance of the tree and grass components while at more mesic sites, the significance of the grass component was lowest on sites with kalahari sand and mopane woodland. The use of NDVI metrics applied in the study provides an additional technique. that explicitly takes into account the tree:grass ratio during the growing season, for the classification of savanna vegetation types at local scale.

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Documento generato il 19/01/20 alle ore 11:44:01