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作 者 ：赵天宏*,郭丹,王美玉,徐胜,何兴元

期 刊 ：生态学报 2009年 29卷 3期 页码：1391~1397

关键词：CO2浓度升高；连续两个生长季；银杏；希尔反应活力；Ca2+/Mg2+-ATP酶活性；光合适应现象；

Keywords:elevated CO2 concentration, two consecutive growth seasons, Ginkgo biloba L., Hill’s reaction activity, Ca2+/Mg2+-ATPase activity, photosynthetic acclimation,

摘 要 ：近年来，随着温室气体浓度不断上升，有关CO2浓度升高对植物影响的研究已取得一定进展，但CO2浓度升高对植物光合作用的影响需要从生理生化水平上进一步深入的研究。以沈阳城市森林树种银杏(Ginkgo biloba L.)为研究对象，利用开顶式气室研究连续两个生长季大气CO2浓度升高对银杏光合特性的影响。结果表明，在大气CO2浓度为700μmol·mol-1条件下，与对照相比，第1个生长季CO2处理的银杏叶片净光合速率极显著增加（P<0.01），希尔反应活力极显著增大（P<0.01）、Ca2+/Mg2+-ATP酶活性显著（P<0.05）或极显著增强（P<0.01）、光合产物淀粉的含量极显著增多（P<0.01）；第2生长季CO2处理的银杏叶片净光合速率显著增加（P<0.05），希尔反应活力在通气60d时极显著（P<0.01）增大，Ca2+/Mg2+-ATP酶活性在处理30d时显著降低（P<0.05），淀粉含量增多。与第1个生长季相比，第2个生长季CO2处理的银杏叶片净光合速率降低，希尔反应活力减小，Ca2+/Mg2+-ATP酶活性减弱，叶绿素含量增多，淀粉含量减少。试验中出现了光合适应现象。

Abstract:As the greenhouse gas has been increasing continually in recent years, the studies on effects of elevated CO2 concentration on plants have already obtained some results, while the effects of plant photosynthesis on physiological and biochemical level should be investigated further. The main photo-physiological characteristics of urban forest species Ginkgo biloba L. in Shenyang were analyzed in open-top chambers under elevated CO2 concentration in two consecutive growth seasons. The results indicated that in the first growth season the leaf net photosynthetic rates(P<0.01), Hill′s reaction activity(P<0.01), Ca2+/Mg2+-ATPase activity(P<0.05 or P<0.01) and starch contents(P<0.01)all increased under elevated CO2 concentration((700±20)μmol·mol-1)compared with the control. In the second growth season the leaf net photosynthetic rates(P<0.05)and starch contents(P<0.01)both increased compared with the control, Hill′s reaction activity(P<0.01)increased on the 60th day of exposure, Ca2+/Mg2+-ATPase activity(P<0.05)decreased on 30th day of exposure. Compared with the first season, the leaf net photosynthetic rates, Hill′s reaction activity, Ca2+/Mg2+-ATPase activity, starch contents all decreased under elevated CO2 concentration,but chlorophyll contents increased. There was photosynthetic acclimation to elevated CO2 concentration under two consecutive growth seasons in this experimentation.

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