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Titolo:
SELECTION AGE AND RISK - FINDING THE COMPROMISE
Autore:
MAGNUSSEN S; YANCHUK AD;
Indirizzi:
FORESTRY CANADA,PETAWAWA NATL FORESTRY INST,POB 2000 CHALK RIVER K0J 1J0 ON CANADA BRITISH COLUMBIA MINIST FOREST,RES BRANCH VICTORIA V8W 3E7 BC CANADA
Titolo Testata:
Silvae Genetica
fascicolo: 1, volume: 42, anno: 1993,
pagine: 25 - 40
SICI:
0037-5349(1993)42:1<25:SAAR-F>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
STOCHASTIC EFFICIENCY; STAND DEVELOPMENT; LOBLOLLY-PINE; GROWTH; PARAMETERS; VOLUME; TRIAL;
Keywords:
EARLY SELECTION; RISK; SIMULATION STOCHASTIC DOMINANCE; BOOTSTRAP;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
43
Recensione:
Indirizzi per estratti:
Citazione:
S. Magnussen e A.D. Yanchuk, "SELECTION AGE AND RISK - FINDING THE COMPROMISE", Silvae Genetica, 42(1), 1993, pp. 25-40

Abstract

Selection ages for height growth in coastal Douglas-fir on four siteson Vancouver Island were determined by stochastic simulation of age-to-age correlations. Stochastic perturbations of expected age-to-age correlations at both family and within-family levels were derived from boot-strapping more than 4000 records of 23 years of observed height growth. Stochastic dominance principles were used to isolate stochastic efficient (risk averse) selection ages in both family and forward selection schemes. The optimum age for family selection depended strongly on the number of progenies tested in each family and on the test site. Early family selection (age <15) required at least 20 trees per family; very early family selection (age <10) is feasible at a low risk at family sizes above 40. Selection ages in forward selection schemes depend on gain expectations from the within-family selection and on the number of trees selected per family. Reliance on gain from within-family selection pushed the stochastic efficient selection age upwards. Selecting fewer trees per family, but more families, increased the recommended selection ages. Age 17 appears to be minimum 'safe' age for conventional forward selection schemes.

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Documento generato il 05/12/20 alle ore 01:41:24