Canadian Forest Service Publications

Ozone effects on growth and productivity of Populus tremuloides Michx.: a comparison of results from OTC, FACE, and ozone gradient studies with a common set of genetic materials. 2006. Karnosky, D.F.; Darbah, J.N.; Sôber, A.; Riikonen, J.; Kets, K.; Nelson, N.; Kubiske, M.E.; Percy, K.E. Pages 325-329 in G. Wieser and M. Tausz, editors., Proceedings: UN-ECE Critical Levels of Ozone: Further Applying and Developing the Flux-based Concept. November 15-19, 2005, Obergurgl, Tyrol, Austria. Federal Research and Training Center for Forests, Natural Hazards and Landscape (BFW), Vienna, Austria.

Year: 2006

Issued by: Atlantic Forestry Centre

Catalog ID: 26575

Language: English

Availability: Order paper copy (free)

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Tropospheric ozone effects on forest trees have been studied intensely for the past 50 years. Yet, it remains very difficult to predict how long-term forest tree growth and productivity are affected by ozone. Here we provide a comparison of results of three growth and productivity studies of ozone impacts on trembling aspen (Populus tremuloides Michx.) that were done with an identical set of genetic materials (clone 216 = intermediate in ozone tolerance; clone 259 = ozone sensitive; and clone 271 = ozone tolerant) over the past 15 years. The studies were done in open-top chambers, an open-air (FACE) system, and along a natural gradient in the Lake States region of the United States. Here, we will compare a suite of responses from foliar to growth and productivity across these three studies. It is our contention that ozone at current levels is limiting the carbon dioxide sink strength of trembling aspen, the most widely distributed tree species in North America, across much of its range.