Interactive Effects of Elevated CO2 Concentration and Irrigation on Photosynthetic Parameters and Yield of Maize in Northeast China
- 作者：Fanchao MengJiahua ZhangFengmei YaoCui Hao
- 会议时间：2014-11-03
- 关键词：Elevated [CO2] ; Open Top Chambers (OTCs) ; Increasing precipitation ; Maize ; Photosynthetic parameters ; Yield ; Irrigation
- 作者单位：Fanchao Meng(Institute of Eco-environment and Agro-meteorology, Chinese Academy of Meteorological Sciences, Beijing, 100081, China; College of Atmospheric Science, Nanjing University of Information Science & Technology, Nanjing, 210044, China)Jiahua Zhang(Key Lab.of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, 100094, China; Institute of Eco-environment and Agro-meteorology, Chinese Academy of Meteorological Sciences, Beijing, 100081,China)Fengmei Yao(Key Lab.of Computational Geodynamics, Chinese Academy of Sciences,Beijing, 100049, China)Cui Hao(Institute of Eco-environment and Agro-meteorology, Chinese Academy of Meteorological Sciences, Beijing, 100081, China)
- 会议名称：第31届中国气象学会年会
- 会议地点：北京
- 主办单位：中国气象学会
- 语种：chi
摘要
Maize is one of the major cultivated crops of China, having a central role in ensuring the food security of the country.There has been a significant increase in studies of maize under interactive effects of elevated CO2 concentration ([CO2]) and other factors, yet the interactive effects of elevated [CO2] and increasing precipitation on maize has remained unclear.In this study, a manipulative experiment in Jinzhou, Liaoning province, Northeast China was performed so as to obtain reliable results concerning the later effects.The Open Top Chambers (OTCs) experiment was designed to control contrasting [CO2] i.e., 390, 450 and 550 μtmol·mo1-1, and the experiment with 15% increasing precipitation levels was also set based on the average monthly precipitation of 5-9 month from 1981 to 2010 and controlled by irrigation.Thus, six treatments, i.e.C550W+15%, C550W0, C450W+15%, C450W0, C390W+15% and C390W0 were included in this study.The results showed that the irrigation under elevated [CO2] levels increased the leaf net photosynthetic rate (Pn) and intercellular CO2 concentration (Ci) of maize.Similarly, the stomatal conductance (Gs) and transpiration rate (Tr) decreased with elevated [CO2], but irrigation have a positive effect on increased of them at each [CO2] level, resulting in the water use efficiency (WUE) higher in natural precipitation treatment than irrigation treatment at elevated [CO2] levels.Irradiance-response parameters, e.g., maximum net photosynthetic rate (Pnmax) and light saturation points (LSP) were increased under elevated [CO2] and irrigation, and dark respiration (Rd) was increased as well.The growth characteristics, e.g., plant height, leaf area and aboveground biomass were enhanced, resulting in an improved of yield and ear characteristics except axle diameter.The study concluded by reporting that, future elevated [CO2] may favor to maize when coupled with increasing amount of precipitation in Northeast China.