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Titolo:
Light extinction coefficients specific to the understory vegetation of thesouthern boreal forest, Quebec
Autore:
Aubin, I; Beaudet, M; Messier, C;
Indirizzi:
Univ Quebec, Grp Rech Ecol Forestiere Interuniv, Montreal, PQ H3C 3P8, Canada Univ Quebec Montreal PQ Canada H3C 3P8 univ, Montreal, PQ H3C 3P8, Canada Univ Quebec, Dept Sci Biol, Montreal, PQ H3C 3P8, Canada Univ Quebec Montreal PQ Canada H3C 3P8 Biol, Montreal, PQ H3C 3P8, Canada
Titolo Testata:
CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE
fascicolo: 1, volume: 30, anno: 2000,
pagine: 168 - 177
SICI:
0045-5067(200001)30:1<168:LECSTT>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
LEAF-AREA INDEX; CANOPY; TRANSMITTANCE; INTERCEPTION; ARCHITECTURE; AVAILABILITY; DYNAMICS; MODELS; STANDS; FIRE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Messier, C Univ Quebec, Grp Rech Ecol Forestiere Interuniv, POB 8888,Ctr Ville Branch, Montreal, PQ H3C 3P8, Canada Univ Quebec POB 8888,Ctr Ville Branch Montreal PQ Canada H3C 3P8
Citazione:
I. Aubin et al., "Light extinction coefficients specific to the understory vegetation of thesouthern boreal forest, Quebec", CAN J FORES, 30(1), 2000, pp. 168-177

Abstract

This study was conducted in six different forest types in Abitibi, Que., (i) to identify the factors that most influence understory light transmission in the southern boreal forest and (ii) to develop light extinction coefficients (k), which could be used to simulate light transmission in the understory. Light availability and understory vegetation (cover, composition, vertical distribution, and leaf area index) were characterized within three strata (0.05-5 m) in a total of 180 quadrats. Calculated k values were basedon measured light availability and leaf area index. These values varied among forest types, strata, understory vegetation types, and cover in the upper stratum. The highest k values were generally associated with a dense stratum of Acer spicatum Lam. We developed five sets of k values based on the factors that most affected light transmission. Measured transmission (T-m) was compared with transmission predicted (T-p) from each set of k values. Light transmission predicted using a single k value (mean k = 0.54) underestimated T-m. More accurate predictions were obtained when we used the other four sets of k values. Our results indicate that, in the southern boreal forest, the understory vegetation can be quite heterogeneous and patterns of light transmission cannot be accurately simulated using a unique k value. However, the various sets of k values developed in this study could be used in prediction models of forest dynamics to obtain relatively good predictions of understory light extinction in forest types similar to the ones studied here.

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Documento generato il 25/11/20 alle ore 06:46:48