Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
AGE-DEPENDENT TREE-RING GROWTH-RESPONSES OF SUB-ARCTIC WHITE SPRUCE TO CLIMATE
Autore:
SZEICZ JM; MACDONALD GM;
Indirizzi:
MCMASTER UNIV,DEPT GEOG HAMILTON L8S 4K1 ONTARIO CANADA
Titolo Testata:
Canadian journal of forest research
fascicolo: 1, volume: 24, anno: 1994,
pagine: 120 - 132
SICI:
0045-5067(1994)24:1<120:ATGOSW>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUMMER TEMPERATURES; WATER RELATIONS; CENTRAL ALASKA; LARIX-LYALLII; NORTH-AMERICA; TIMBERLINE; WIDTH; DENDROCLIMATOLOGY; RECONSTRUCTION; CONIFERS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
66
Recensione:
Indirizzi per estratti:
Citazione:
J.M. Szeicz e G.M. Macdonald, "AGE-DEPENDENT TREE-RING GROWTH-RESPONSES OF SUB-ARCTIC WHITE SPRUCE TO CLIMATE", Canadian journal of forest research, 24(1), 1994, pp. 120-132

Abstract

We test one of the fundamental assumptions of most dendroclimatological research, that the radial growth response of trees to climate does not vary with age once the biological growth trend has been removed. Picea glauca (Moench) Voss from three sites in the western Northwest Territories, Canada, are disaggregated into age-classes, and their response to climate examined through response function and linear regression analyses. These data are then used in multiple regression analyses to estimate June-July temperatures at Norman Wells, N.W.T., from 1909 to 1989 using both age-dependent and standard (age-independent) models. The response function and regression analyses suggest that the response of Picea glauca radial growth to climate differs between trees greater than 200 years old and less than 200 years old. These results suggest that the assumption of an age-invariate climate-growth function istherefore invalid at these sites. These apparent age-dependent responses are site specific and may reflect physiological changes related toaging. One possible causal factor of age dependence is that the treesare becoming increasingly moisture stressed with age owing to a reduction in the efficiency of water and nutrient translocation mechanisms. The estimation of June-July temperatures based on an age-dependent model produced improved calibration and verification statistics as compared with a reconstruction based on standard dendroclimatic modelling. If present, age-dependent climate-growth relationships may result in less accurate reconstructions of past climate, particularly during the early portions. However, age-dependent responses could also be used toincrease the number of tree-ring based predictor variables for dendroclimatic reconstructions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/07/20 alle ore 10:51:52