北京城区夏、秋季节短期增温对月季暗呼吸及光合参数的影响  

Ecological effects of short-time increased air temperature in Summer and Autumn periods on dark respirations and typical photosynthetic characteristics for Rosa chinensis in Beijing urban areas

作　　者：张富华[1,2] 胡聃[2] 孙凡[1] 郭振[2] 李元征[2] 王晓琳[2] 马生丽[1] 

机构地区：[1]西南大学资源环境学院,重庆400715 [2]中国科学院生态环境研究中心城市与区域生态国家重点实验室,北京100085

出　　处：《生态学报》2014年第24期7385-7392,共8页Acta Ecologica Sinica

基　　金：国家自然科学基金(41171442,70873121);城市与区域生态国家重点实验室(SKLURE2012-1-01);中国科学院“一三五”计划(YSW2013-B04)

摘　　要：与光呼吸不同,光对植物叶片暗呼吸具有明显抑制作用。目前,植物叶片这一生理生态现象很少受到关注,但光抑制呼吸会导致叶片日间碳损失,对植物碳平衡有重要影响。利用Li-6400(Li-Cor,USA)光合仪模拟北京城区夏、秋季增温对月季(Rosa chinensis)叶片暗呼吸及光合参数的影响。结果表明:(1)短期增温处理显著提高了蒸腾速率(Tr),降低了胞间CO2浓度(Ci),夏季增温时气孔导度(Gs)降低而秋季增温明显升高。(2)夏季增温5℃,有光暗呼吸(RL)显著高于增温2℃(P<0.05),而增温2℃对RL影响不显著(P>0.05);秋季增温5℃,RL显著高于增温3℃(P<0.05)。4个不同短期增温处理都对无光暗呼吸(RD)影响显著(P<0.05)。(3)秋季增温5℃对光抑制呼吸影响显著(P<0.05);其它3个短期增温影响不显著(P>0.05)。(4)秋季增温5℃,月季暗呼吸对增温敏感性显著高于增温3℃的值(P<0.05)。目的为分析城市白昼气温上升导致植物叶片碳损失估计提供实验案例,是提高城市植物碳汇生态服务功能可能途径的基础。Leaf dark respiration plays an important role in plant carbon balance, but the characteristic ecological physiological effects of air temperature variations on leaf R in urban areas is not well known up to now. Leaf dark respiration during illumination varies between 16% and 77% of the respiratory activity in darkness,and the light inhibition of dark respiration seems to depend on the photosynthetic processes,and to lead to daytime carbon loss of plant leaves,which has important ecological effects on plant carbon balance. In this research,we used Li-6400（ Li-Cor,USA） to make four different treatments of urban short-time air temperature raising（ USATR） to examine its ecological physiological effects on leaf dark respiration（ R） and typical photosynthetic characteristics in Beijing urban areas. We examined the ecological results of these four types of daytime USATR for affecting leaf dark respiration and photosynthetic characteristics of Rosachinensis. The results show that：（ 1） Daytime USATR observably improved Transpiration rate（ Tr）,while it decreased intercellular concentration of CO2. Stomatal conductance（ Gs） in daytime USATR decreased in Summer,but in Autumn observably improved.（ 2） In daytime USATR of 5℃ in Summer for RLwas significantly higher than that in daytime USATR of 2℃（ P〈0.05）,but daytime USATR of 2℃ had not obvious significances（ P〉0.05）; In daytime USATR in Autumn of5℃ for RLwas also significantly higher than that in daytime USATR of 3℃（ P〈0.05）,but daytime USATR of 3℃ had not obvious significances（ P〉0.05）. Four different types of daytime USATR in Summer and Autumn had obvious significances（ P〈0.05） on daytime R measured by shading leaves（ RD）.（ 3） Daytime USATR of 5℃ in Autumn had obvious significant effects（ P〈0.05） on light-inhibited leaf R,but the other three types of daytime USATR were not significant（ P 〉 0.05）.（ 4） In Autumn,the sensitivity of RLand RDto temperature variations is higher durin

关 键 词：城市短期增温 有光暗呼吸(RL) 无光暗呼吸(RD) 光抑制呼吸 光合参数 月季 北京城区 

分 类 号：S685.12[农业科学—观赏园艺]