Effects of water-logging stress on net photosynthetic rate changes of winter wheat
Xiao Menghua1, Hu Xiujun2, Fang Kai3, Miao Zimei1
1.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Institute of Hydraulic & Environmental Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou, Zhejiang 310018, China; 3.Water Conservancy Bureau of Suqian, Suqian, Jiangsu 223800, China
Abstract：Based on the water level control technology, a field experiment was conducted to study the water level regulation and control on variation of net photosynthetic rate, at different growth stages, water depth and deep groundwater of winter wheat farmland. The experimental results showed that: floo-ding depth shallow and moderate duration on winter wheat had minimal impact on photosynthetic rate, with the same water level and water-logging duration, the faster water felled the larger net photosynthe-tic rate increased; under different water control conditions, variation curves of each growth stage of winter wheat in net photosynthetic rate was appeared "M" shape. With the increase of photosynthetic active radiation enhancement and temperature increases rapidly in the morning, with the effect of radiation attenuation and temperature decreased greatly decreased at afternoon, but the change was slow at noon. The net photosynthesis rate peak value appeared in 11:00 and 13:00, decreased significantly in 12:00, namely "noon break" phenomenon; lastly, wheat net photosynthetic rate had a certain correlation with photosynthetic active radiation, solar radiation, air temperature, air relative humidity and wind speed. The net photosynthetic rate had strong correlation between total solar radiation and photosynthetic active radiation, but weak correlation between air temperature, air humidity and wind speed.
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