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生态学杂志 ›› 2011, Vol. 30 ›› Issue (06): 1075-1082.

• 研究报告 • 上一篇    下一篇

臭氧胁迫对冬小麦灌浆期光合日变化的影响

郑有飞1,2**,刘瑞娜2,吴荣军2,赵泽2,胡程达2   

  1. 1江苏省大气环境监测与污染控制高技术研究重点实验室, 南京 210044;2南京信息工程大学环境科学与工程学院, 南京 210044
  • 出版日期:2011-06-08 发布日期:2011-06-08

Effects of ozone stress on diurnal change of winter wheat photosynthesis at milking stage.

ZHENG You-fei1,2**, LIU Rui-na2, WU Rong-jun2, ZHAO Ze2, HU Cheng-da2   

  1. 1Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing 210044, China;2College of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
  • Online:2011-06-08 Published:2011-06-08

摘要: 利用开顶式气室(OTC)开展了大田实验条件下地表臭氧浓度增加对灌浆期冬小麦光合日变化影响的实验研究。结果表明:13:00—15:00大田环境变量(光合有效辐射、温度、水气压差)对冬小麦光合作用产生了胁迫;与对照组相比,100和150 nl·L-1臭氧熏气下净光合速率平均下降了6.3%和11.1%(P<0.05);100 nl·L-1臭氧熏气下气孔限制值、蒸腾速率、气孔导度、水分利用率变化趋势与对照组基本一致,但在150 nl·L-1臭氧熏气下,11:00之前蒸腾速率和气孔导度均显著增加,水分利用率显著下降,13:00—15:00,水分利用率显著增高;在无环境胁迫条件下,100和150 nl·L-1臭氧熏气分别对冬小麦光合作用产生了气孔限制和非气孔限制,导致光合速率下降。环境变量胁迫下,100和150 nl·L-1臭氧熏气均显著提高了冬小麦的水分利用率,且150 nl·L-1臭氧熏气显著提高了进入气孔用于光合作用的二氧化碳比例。

关键词: 长江上游, 暗针叶林, 土壤水分, 渗透

Abstract: By using open top chamber, a field experiment was conducted to study the effects of elevated ozone concentration on the diurnal change of winter wheat photosynthesis at milking stage. At 13:00-15:00, the field environmental variables (photosynthetic active radiation, chamber temperature, and vapor pressure difference) were the menace to the winter wheat photosynthesis. Comparing with the control, fumigation with 100 and 150 nl·L-1 of ozone led to the decrease of net photosynthetic rate by 6.3% and 11.1%, respectively (P<0.05). In treatment 100 nl·L-1 of ozone, the stoma limit value, transpiration rate, stomatal conductance, and water use efficiency had a change trend basically in accordance with that in control; whereas in treatment 150 nl·L-1 of ozone, the transpiration rate and stomatal conductance increased significantly before 11:00, but the water use efficiency was in adverse. At 13:00-15:00, the water use efficiency increased significantly in both cases. The above evidences indicated that under no environmental stress, the decrease of net photosynthetic rate could be attributed to the stomatal and non-stomatal limitation in treatments 100 and 150 nl·L-1 of ozone, respectively. Under stressed environment, both 100 and 150 nl·L-1 of ozone improved the winter wheat water use efficiency significantly, moreover, 150 nl·L-1 of ozone induced a significant increase of intercellular CO2 use efficiency.

Key words: Upper reaches of Yangtze River, Dark coniferous forest, Soil water, Infiltration