Impacts of the tropospheric ozone on rice and winter wheat in the Yangtze River delta region

摘要

The impacts of different of O_3 concentration on the yield of rice and winter wheat were studied by using open-top chambers (OTCs). The results showed: Compared to the control treatment, 200ppb, 100ppb, 50ppb, NF treatments caused a -80.4%, -58.6%, -10.5%, +4.7% decrease in grain yield per winter wheat plant and a -49.1%, -26.1%, -8.2%, -7.3% decrease in grain yield per rice plant, respectively. According to the dose-response relation educed from field experiment and the monitored data of O_3 concentrations in spots, it was estimated that the yield losses of rice and water wheat resulted by O_3 pollution in the Yangtze River delta region in 1999 were 0.599 million ton and 0.669 million ton, economic losses were 0.539 billions RMB and 0.936 billions RMB, respectively.