Premium
Tree growth‐climate relationships at the northern boreal forest tree line of North America: Evaluation of potential response to increasing carbon dioxide
Author(s) -
D'Arrigo Rosanne D.,
Jacoby Gordon C.
Publication year - 1993
Publication title -
global biogeochemical cycles
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.512
H-Index - 187
eISSN - 1944-9224
pISSN - 0886-6236
DOI - 10.1029/93gb01672
Subject(s) - boreal , dendrochronology , taiga , environmental science , tree line , climate change , range (aeronautics) , precipitation , physical geography , latitude , climatology , dendroclimatology , greenhouse gas , atmospheric sciences , ecology , geography , forestry , geology , meteorology , biology , archaeology , materials science , geodesy , composite material
Tree growth at the northern limit of the range of boreal forests is primarily limited by temperature‐related factors. Thus the position of this range limit, and the growth rates of trees along the northern forest border, may undergo significant change if predictions of enhanced greenhouse warming at northern latitudes are realized. In this paper we evaluate tree ring width and maximum latewood density chronologies of white spruce for three temperature‐sensitive tree line sites in northern North America: in the Brooks Range, Alaska, the Franklin Mountains, Northwest Territories, and Churchill, Manitoba. The ring width data, which more strongly integrate low‐frequency temperature trends than the density series, show overall enhanced growth and inferred warming during the period of anthropogenic increase in greenhouse gases. The recent growth at these sites equals or exceeds that which has occurred during earlier centuries of more clearly natural climate variability. When the ring width and density variations are estimated using temperature and precipitation data in principal components regression analysis, no substantial residual trends are detected which might require CO 2 or other nutrient fertilization as an additional explanation for recent growth changes.