大气CO2和O3浓度升高对银杏构件生长的影响

Effects of elevated CO_2 and O_3 on modular growth of Ginkgo biloba

采用开顶箱模拟试验,探讨了大气CO2和O3浓度升高对银杏构件生长的影响。结果表明:高浓度O3抑制银杏主枝和侧枝生长(P<0.01);高浓度CO2对银杏粗生长影响不显著(P>0.05),但在高浓度O3和CO2、O3复合气体条件,银杏粗生长受到严重抑制(P<0.01);高浓度CO2可促进银杏叶片面积和干物质的增加,并能提高叶片含水量和抗干旱能力,但在高浓度CO2、O3复合气体条件下,叶片面积增加不显著(P>0.05),而干物质增加极显著(P<0.01);O3对银杏叶片构件生长有明显抑制作用,叶面积大小和干物质量明显低于对照株(P<0.05)。

The study on the effects of elevated CO2 and O3 on the modular growth ot Ginkgo biloba showed that elevated O3 inhibited the growth of axial and lateral shoots significantly （P 〈 0.01 ） , while elevated CO2 had no significant effects on the diameter growth of G. biloba （ P 〉 O. 05）. The diameter growth of G. biloba was inhibited significantly by elevated O3 and its combination with CO2 （P 〈 0.01 ）. Elevated CO2 increased the leaf area, dry matter accumulation, water content, and drought resistance; while the combination of elevated CO2 and O3 only increased the leaf dry matter accumulation significantly （ P 〈 0.01 ） but had less effects on leaf area. Elevated O3 had significant inhibitory effects on the leaf modular growth of G. biloba, under which, the leaf area and dry matter accumulation decreased significantly （ P 〈 0.05 ）, compared with the control.