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Titolo:
FORMATION AND VERTICAL-DISTRIBUTION OF JUVENILE AND MATURE WOOD IN A SINGLE STEM OF CRYPTOMERIA-JAPONICA
Autore:
YANG KC; CHEN YS; CHIU C;
Indirizzi:
LAKEHEAD UNIV,SCH FORESTRY THUNDER BAY P7B 5E1 ONTARIO CANADA TAIWAN FORESTRY RES INST,DEPT FOREST UTILIZAT TAIPEI TAIWAN
Titolo Testata:
Canadian journal of forest research
fascicolo: 5, volume: 24, anno: 1994,
pagine: 969 - 975
SICI:
0045-5067(1994)24:5<969:FAVOJA>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
PINE; DENSITY; AGE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
K.C. Yang et al., "FORMATION AND VERTICAL-DISTRIBUTION OF JUVENILE AND MATURE WOOD IN A SINGLE STEM OF CRYPTOMERIA-JAPONICA", Canadian journal of forest research, 24(5), 1994, pp. 969-975

Abstract

A single tree stem was used to study the formation and vertical distribution of juvenile and mature wood in Cryptomeria japonica D. Don. The sample tree was collected from a 45-year-old plantation with 1.5 x 3.0 m spacing at Maio-li, Taiwan. Nine diametric wood strips were cut from the tree trunk from both the east and the west aspects, starting from 0.3 m by increments of 2.5 m to the top of the tree. The widths ofjuvenile and mature wood were recorded with two measures, i.e., the number of rings and the width in millimetres. The relationships betweenboth the width of juvenile and mature wood and the height and age at each level of the tree were obtained by regression methods. The relationships between the age of the cambial initial and the period of juvenile wood formation at the various height levels were also determined. It was found that juvenile wood has a conical shape with a wide base at the bottom of the tree. There is no significant difference in the ratio of juvenile to mature wood width between the east and west aspectsof the tree. The impact of both the height and age at each level of the tree on the width of juvenile wood appears to differ, and a similarobservation must be made for mature wood. A high proportion of the total wood volume (64%) was found to be juvenile wood. No mature wood was observed at the top of the tree. The width of juvenile wood is highly correlated with the age of formation of cambial initials counted from the year of seed germination. The older the cambial initial, the narrower is the width of juvenile wood in terms of ring count.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 07:32:30