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Titolo:
Growth and photosynthesis of seedlings of four tree species from a dry tropical afromontane forest
Autore:
Fetene, M; Feleke, Y;
Indirizzi:
Univ Addis Ababa, Fac Sci, Dept Biol, Addis Ababa, Ethiopia Univ Addis Ababa Addis Ababa Ethiopia Dept Biol, Addis Ababa, Ethiopia
Titolo Testata:
JOURNAL OF TROPICAL ECOLOGY
, volume: 17, anno: 2001,
parte:, 2
pagine: 269 - 283
SICI:
0266-4674(200103)17:<269:GAPOSO>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
CHLOROPHYLL FLUORESCENCE; RELATIVE IMPORTANCE; LIGHT ENVIRONMENT; COSTA-RICA; GRADIENT; PLANTS; TRAITS; CANOPY; YIELD;
Keywords:
afromontane forests; forest regeneration; Hagenia; Juniperus; Olea; pioneers; Podocarpus;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Fetene, M Univ Addis Ababa, Fac Sci, Dept Biol, POB 30193, Addis Ababa, Ethiopia Univ Addis Ababa POB 30193 Addis Ababa Ethiopia baba, Ethiopia
Citazione:
M. Fetene e Y. Feleke, "Growth and photosynthesis of seedlings of four tree species from a dry tropical afromontane forest", J TROP ECOL, 17, 2001, pp. 269-283

Abstract

Growth, photosynthesis and carbon allocation pattern were studied in four dry afromontane forest tree species (Olea europea subspecies cuspidata, Podocarpus falcatus, Hagenia abyssinica and Juniperus procera) under varied light regimes in a greenhouse. The objective of the study was to assess the potential of the species for growth under forest canopies and to identify their habitat preferences. The light regimes were created using shade cloth and the) corresponded with deep forest understoreys (2% of the light in the open gap); moderate shade (10%), slight shade as is found in edges of forest gaps (20%) and 100% representing open gaps. Seedling biomass was significantly influenced by light regimes for all species as were total leaf area and relative growth rate. H. abyssinica had the highest growth rate but the lowest survival rate in shade. There was a consistent trend for higher specific leaf area (SLA) and leaf area ratio (LAR) at lower growth light regimes in O. europea and P. falcatus. O. europea and P. falcatus had similar allocation patterns whereby between 20-40% of the total biomass uas allocated to stem, 20-30% to roots and 50-60% to leaves. In H. abyssinica up to 80% was allocated to leaves and only a small percentage to stem and to roots. Within species there were significant differences in the light saturated rate of photosynthesis (A(max)) per unit area among the plants grown at the lowest light level and in the open. For plants grown in the open there werever): little among species differences in A,,,, per unit area. However, there were significant differences in the ii,,, of the different species grown at the lowest light level. Chlorophyll fluorescence measurements indicated that open-grown P. falcatus and O. europea experienced moderate photoinhibition. From the growth and photosynthesis results P. falcatus and O. europea appeared to be non-pioneer, shade-tolerant species, while J. procera andto a larger extent H. abyssinica showed pioneer, light-demanding characteristics. The results ar e discussed in terms of the occurrence of the species in the mosaic climaxes of afromontane forests.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/10/20 alle ore 13:27:31