摘要
近年来,随着温室气体体积分数不断上升,研究CO2和O3体积分数升高对植物的影响已取得一定进展,但二者对植物的复合作用及生理研究不够深入。文章利用开顶式气室研究了大气CO2和O3体积分数升高对银杏(Ginkgo biloba L.)光合特性的影响。结果表明,在整个生长季内,与对照相比,在大气CO2体积分数为700×10-6条件下,银杏叶片净光合速率显著增加(P<0.05),希尔反应活力增大,Ca2+/Mg2+-ATPase活性增强,光合产物可溶性糖和淀粉含量增多;而在O3体积分数为80×10-9的情况下,银杏叶片净光合速率下降,希尔反应活力减小,Ca2+/Mg2+-ATPase活性减弱,光合产物可溶性糖和淀粉含量减少;在CO2和O3复合作用(700×10-6+80×10-9)条件下,银杏叶片净光合速率、希尔反应活力、可溶性糖和淀粉均有所增加,且淀粉含量增加极显著(P<0.01),而Ca2+-ATPase活性先增强后减弱,Mg2+-ATPase活性先减弱后增强。说明CO2可缓解O3对银杏的负效应,而O3亦对CO2的正效应有削弱作用。
With the greenhouse gas has been increasing in recent years, the studies on effects of elevated CO2 and O3 concentration on plants have already got some definite results, but the interactive effect and plant physiology on plants have seldom reserched.The main photo-physiological charcteristics of Ginkgo biloba L. were analyzed in open-top chambers under elevated CO2 and O3 concentration. The results indicated that the leaves net photosynthetic rates （ P〈0.05 ）, Hill activity, Ca^2＋/Mg^2＋-ATPase activity ,soluble sugar and starch contents all increased under elevated CO2 concentration （700× 10^-6） in whole growing season. While under elevated O3 concentration （80×10^-9）, the leaves net photosynthetic rates ,Hill activity, Ca^2＋/Mg^2＋-ATPase activity, soluble sugar and starch contents all decreased, Under elevated CO2 andO3 concentration （700× 10^-6＋80× 10^-9）, the leaves net photosynthetic rates, Hill activity, soluble sugar and starch contents all increased, and the starch contents reached best significant level（P〈0.01）, but Ca^2＋-ATPase activity increased during the earlier growing season, decreased in later growing season, while Mg^2＋-ATPase activity responded contrarily. The beneficial effects of CO2 are more than compensate the negative effects imposed by O3, and the latter in its turn partly counteracted the positive effects of the former.
出处
《生态环境》
CSCD
北大核心
2007年第5期1406-1410,共5页
Ecology and Environmnet
基金
国家自然科学基金重点项目(90411019)
辽宁省教育厅高校科研项目(2005)
中国科学院陆地生态过程重点实验室基金(2005)
