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Titolo:
LEAF OPTICAL-PROPERTIES ALONG A VERTICAL GRADIENT IN A TROPICAL RAIN-FOREST CANOPY IN COSTA-RICA
Autore:
POORTER L; OBERBAUER SF; CLARK DB;
Indirizzi:
WAGENINGEN UNIV AGR,DEPT FORESTRY,POB 342 6700 AH WAGENINGEN NETHERLANDS UNIV UTRECHT,DEPT PLANT ECOL & EVOLUT BIOL 3508 TB UTRECHT NETHERLANDS FLORIDA INT UNIV,DEPT BIOL SCI MIAMI FL 33199 FAIRCHILD TROP GARDEN MIAMI FL 33156 ORG TROP STUDIES,LA SELVA BIOL STN SAN PEDRO 2050 COSTA RICA
Titolo Testata:
American journal of botany
fascicolo: 10, volume: 82, anno: 1995,
pagine: 1257 - 1263
SICI:
0002-9122(1995)82:10<1257:LOAAVG>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
EXTREME-SHADE PLANTS; FLUX-DENSITY; PHOTOSYNTHESIS; ABSORPTION; PATTERNS; SUN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
39
Recensione:
Indirizzi per estratti:
Citazione:
L. Poorter et al., "LEAF OPTICAL-PROPERTIES ALONG A VERTICAL GRADIENT IN A TROPICAL RAIN-FOREST CANOPY IN COSTA-RICA", American journal of botany, 82(10), 1995, pp. 1257-1263

Abstract

Leaf optical properties (400-1,100 nm) were compared for four speciesof rain forest trees with crowns in understory, mid-canopy, and canopy positions to test whether optical properties change with light environment. The species tested represent a spectrum of regeneration patterns ranging from shade tolerant to light demanding. Overall, leaf optical properties of the four species were similar. Differences in absorptance were small, but statistically significant among the species and positions along the canopy gradient. Species absorptance differences corresponded somewhat to shade tolerance; two of the shade species showed higher absorptance in lower light environments, while the sun species showed the reverse pattern. Specific leaf mass (leaf weight per unitarea) and chlorophyll content per unit leaf weight also changed alongthe canopy gradient. Specific leaf mass was positively correlated andchlorophyll per unit leaf weight was negatively correlated with increasing light environment. Consequently, the efficiency of absorption, as represented by the absorptance per unit leaf weight, increased as light level decreased, largely due to changes in specific leaf mass. In contrast, efficiency of absorption per unit leaf chlorophyll was relatively constant with light environment for the two species measured forchlorophyll.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/01/21 alle ore 05:59:46