城市蒙古栎对近地层臭氧浓度升高的光合生理响应  

Photosynthetic physio-response of urban Quercus mongolica leaves to surface elevated ozone concentration

作　　者：黄爽[1] 赵天宏[1] 金东艳[1] 徐胜 

机构地区：[1]沈阳农业大学农学院,辽宁沈阳110161 [2]中国科学院沈阳应用生态研究所,辽宁沈阳110016

出　　处：《辽宁林业科技》2009年第5期1-4,34,共5页Liaoning Forestry Science and Technology

基　　金：国家自然科学基金重点项目(90411019)

摘　　要：近地层O3浓度的增加已经成为当今环境科学研究的热点问题之一,该文主要模拟沈阳城市森林的常用绿化树种蒙古栎对近地层O3浓度升高的光合生理响应,为沈阳市城市森林树种的选育提供理论依据。本试验利用开顶式气室研究蒙古栎叶片对臭氧浓度升高的光合生理响应。结果表明,蒙古栎叶片在高浓度O3熏蒸下,净光合速率、光合色素、光合产物、光合电子传递和光合磷酸化指标随着熏蒸时间的延长而呈现出先上升后下降的趋势,相对电导率呈上升趋势。在通气30d时,净光合速率、类胡萝卜素含量、ATP酶及淀粉含量均与对照达到差异极显著(p<0.01),而叶绿素含量与对照差异显著(p<0.05);在通气90d时,净光合速率和类胡萝卜素含量与对照差异显著(p<0.05),而叶绿素含量和Mg2+-ATP酶活性与对照差异极显著(p<0.01)。在臭氧浓度升高条件下,蒙古栎叶片光合作用能力下降。Surface layer O3 concentration increases has become one of hot issues of the environment scientific research. This paper simulated the photosynthetic physio-response of Quercus mongolica, a main greening tree species in Shenyang urban forest, under elevated ozone concentration. With the use of open-top chamber device, the photosynthetic physio-respouse of elevated ozone concentration on urban Quercus mongolica leaves for a growing season was studied.The results showed that with the high concentration of ozone fumigation, net photosynthetic rote, photosynthetic pigment, photosynthate, photosynthetic electron transport and photophos-phorylation were as the trend of increasing firstly then decreasing lastly and relative electrical conductivity increased compared with the control. It can be seen that net photosynthetic rate, carotenoid, ATPase and starch of treated leaves were lower than that of the control, which the differences reached best significant level （p〈0.01 ） and chlorophyll reached significant difference （p〈0.05） in the 30d. While the decrease of net photosynthetic rate and reached significant level （p〈0.05）,but the decrease of chlorophyll and Mg^2＋-ATPase reached best significant level （p〈0.01 ） compared with the control in the 90d. The photosynthetic ability of Quercus mongolica leaves has declined under the elevated ozone concentration.

关 键 词：城市森林 蒙古栎 O3浓度升高 光合生理响应 

分 类 号：S718.512.2[农业科学—林学]