Diurnal Variation of Instantaneous CO_2 and H_2O Gas-exchange over Canopy and Leaf level of Spring Maize in Arid Area
文献类型： 会议论文
第一作者： Jiaxuan Guo
作者： Jiaxuan Guo 1 ; Xurong Mei 2 ; Yuzhong Li 2 ;
作者机构： 1.Beijing Key Laboratory of new technology in agricultural application, College of Plant and Technology, Beijing University of Agriculture
2.Water Resources and Dryland Farming Laboratory, Institute of Agricultural Environment and Sustainable Development, Chinese Academy of Agricultural Sciences
关键词： Canopy level;Leaf level;Gas-exchange;Water use efficiency
会议名称： International Conference on Advances in Energy and Environmental Science
主办单位：
页码： 1806-1815
摘要： Information on the relationship between crop photosynthetic rate and water use efficiency at the leaf level and these at the canopy level is important on the study of theory and practice of high efficiency and water-saving agriculture. We simultaneous made instantaneous CO_2 and H_2O exchange rate, and instantaneous water use efficiency measurement at both leaf and canopy level in a rain-fed cropping system with spring corn during filling stage by Li-6400 infrared gas analysis meter and eddy correlation system. The results showed that in arid area water stress was the mainly factor influencing the net photosynthesis rate and water use efficiency. At the diurnal course, when soil relative moisture was about 40% at 0-100 cm soil layer, the maximum of net photosynthetic rate at leaf level occurred at about 10:00 under soil water stress, and at about 12:00 at canopy level on sunny days, the maximum leaf photosynthetic rate reached 1.3 mg·m~(-2)s~(-1), almost close to those of irrigation corn at similar latitude area, and the maximum canopy assimilation rate were 0.9 mg·m~(-2)s~(-1), reached 54.5% of those of irrigation corn at similar latitude area during filling stage, respectively; The maximum values of instantaneous water use efficiency at leaf and canopy level were 0.16 g (CO_2)/g (H_2O) and 0.06 g (CO_2)/g (H_2O), and ranged between 0.0055g (CO_2)/g (H_2O) and 0.0123 g (CO_2)/g (H_2O), 0.0113 g(CO_2)/g (H_2O) and 0.0197 g(CO_2)/g (H_2O) around noon, respectively. Instantaneous net photosynthetic rate and water use efficiency at leaf level were higher than those at canopy level after 10:00.
分类号： x37-53
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