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Titolo:
GROWTH, ALLOCATION, AND MORPHOLOGICAL RESPONSES OF BETULA-PUBESCENS AND BETULA-PENDULA TO SHADE IN DEVELOPING SCOTS PINE STANDS
Autore:
MESSIER C; PUTTONEN P;
Indirizzi:
UNIV QUEBEC,RECH ECOL FORESTIERE GRP,CP 8888,SUCCURSALE A MONTREAL PQH3C 3P8 CANADA UNIV QUEBEC,DEPT BIOL SCI MONTREAL PQ H3C 3P8 CANADA UNIV HELSINKI,DEPT FOREST ECOL SF-00170 HELSINKI FINLAND
Titolo Testata:
Canadian journal of forest research
fascicolo: 4, volume: 25, anno: 1995,
pagine: 629 - 637
SICI:
0045-5067(1995)25:4<629:GAAMRO>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
EXCHANGE RESIN BAGS; LEAF MORPHOLOGY; NITROGEN AVAILABILITY; FOREST SUCCESSION; WESTERN HEMLOCK; LIGHT; SEEDLINGS; TOLERANCE; PLANTS; CANOPY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
52
Recensione:
Indirizzi per estratti:
Citazione:
C. Messier e P. Puttonen, "GROWTH, ALLOCATION, AND MORPHOLOGICAL RESPONSES OF BETULA-PUBESCENS AND BETULA-PENDULA TO SHADE IN DEVELOPING SCOTS PINE STANDS", Canadian journal of forest research, 25(4), 1995, pp. 629-637

Abstract

The growth, biomass allocation, crown architecture, and leaf morphology of 50 to 200 cm tail Betula pubescens Ehrh. and Betula pendula Rothseedlings growing under eight Scots pine (Pinus sylvestris L.) standsvarying in age from 7 to 105 years were studied in southern Finland. The main objective of the study was to assess the degree of morphological plasticity of birch in response to understory conditions in standsof varying structure. In each of these stands, the light, water, and nutrient availability were measured. No clear trend in nutrient and water availability was found from the 7- to 105-year-old stands. Light availability decreased from the 7-year-old stands (45% and 82% of full sunlight in nongap and gap locations, respectively) to the 20-year-oldstands (5% and 12% of full sunlight), and then increased to the mature stands (21% and 26% of full sunlight). Relative branch growth rate and height increment decreased with increasing shade. The ratios of leaf area to branch length and to branch weight did not vary significantly among the eight stands. The ratios of height to diameter and fine-root biomass to leaf biomass were the highest under the most shaded stands (20-year-old). Increase in shading decreased leaf thickness and increased specific leaf weight. No major differences were found in any ofthe growth parameters measured between the two birch species, indicating that they do not differ in their juvenile stage. These results indicate that these two birch species have relatively little morphological plasticity in response to shade. They appear to be able to persist in shade by minimizing carbon demand for growth and by modifying leaf morphology to presumably optimize photosynthesis.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/07/20 alle ore 20:05:50