Tropospheric O3 compromises net primary production in young stands of trembling aspen, paper birch and sugar maple in response to elevated atmospheric CO2. - King,J..S..; Kubiske,M..E..; Pregitzer,K..S..; Hendrey,G..R..; McDonald,E..P..; Giardina,C..P..; Quinn,V..S..; Karnosky,D..F.. (New Phytologist, 2005)