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Tropospheric O 3 compromises net primary production in young stands of trembling aspen, paper birch and sugar maple in response to elevated atmospheric CO 2
Author(s) -
King John S.,
Kubiske Mark E.,
Pregitzer Kurt S.,
Hendrey George R.,
McDonald Evan P.,
Giardina Christian P.,
Quinn Vanessa S.,
Karnosky David F.
Publication year - 2005
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.2005.01557.x
Subject(s) - primary production , biomass (ecology) , environmental science , maple , tropospheric ozone , fumigation , ozone , temperate rainforest , temperate climate , betula pendula , carbon sequestration , sugar , temperate forest , atmospheric sciences , carbon dioxide , agronomy , botany , ecology , chemistry , ecosystem , biology , biochemistry , organic chemistry , geology
Summary• Concentrations of atmospheric CO 2 and tropospheric ozone (O 3 ) are rising concurrently in the atmosphere, with potentially antagonistic effects on forest net primary production (NPP) and implications for terrestrial carbon sequestration. • Using free‐air CO 2 enrichment (FACE) technology, we exposed north‐temperate forest communities to concentrations of CO 2 and O 3 predicted for the year 2050 for the first 7 yr of stand development. Site‐specific allometric equations were applied to annual nondestructive growth measurements to estimate above‐ and below‐ground biomass and NPP for each year of the experiment. • Relative to the control, elevated CO 2 increased total biomass 25, 45 and 60% in the aspen, aspen–birch and aspen–maple communities, respectively. Tropospheric O 3 caused 23, 13 and 14% reductions in total biomass relative to the control in the respective communities. Combined fumigation resulted in total biomass response of −7.8, +8.4 and +24.3% relative to the control in the aspen, aspen–birch and aspen–sugar maple communities, respectively. • These results indicate that exposure to even moderate levels of O 3 significantly reduce the capacity of NPP to respond to elevated CO 2 in some forests.