Combination effects of elevated O3 and CO2 on growth and hydraulic function of representative trees

采用开顶式气室对杂种落叶松F_1（落叶松×落叶松×落叶松）的直径生长进行了研究。高O_3（60 ppb，7 h/d）对日本山奈（Kaempfrei）的生长有抑制作用，主要是由于针叶和细根干重减少。在高CO2（600 ppm，天），F1和它的父母的增长增加和O3诱导的抑郁症是温和的。然而，恢复O3引起的F1下降不能简单地解释由高CO2气孔关闭。60 ppb浓度的O_3熏蒸对毛榉幼树的相对生长率抑制25%左右，而对同龄的蒙古栎幼树的相对生长率没有影响。（树）被发现。

With use of open top chambers, the diameter growth of hybrid larch F1 (Larix gmelinii x L. kaempfrei) was suppressed by high O3 (60 ppb, 7 hours in day) which is mainly due to decrease of dry-mass needles and fine roots. At high CO2 (600 ppm, day), the growth of F1 and its parents was increased and the O3-induced depression was moderated. However, recovery of O3-induced decrease of F1 was not simply explained by stomatal closores by high CO2. Relative growth rate of young beech (Fagus crenata) trees was about 25 % suppressed by 60 ppb with free-air O3 fumigation, by contract no decrease in the same age of oak (Quercus mongolica var. crispula) trees was found.