Waterlogging effects on winter wheat carbon flux at jointing stage
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Abstract:
In order to explore the relationship between carbon balance of farmland ecosystem under waterlogging stress, a typical test area was set up in Wudaogou experimental station, and the winter wheat jointing stage was used as the research period to carry out the control experiments. The surface/ subsurface waterlogging test and the normal test were set to measure and analyze the changing trend of the carbon flux under different conditions. T he results show that: under normal conditions, the carbon flux of winter wheat in the jointing stage is carbon sink, with the lowest carbon flux is at 13 o’clock, the carbon flux on a sunny day is lower than that on a rainy day, the carbon flux o n a sunny day after continuous rainy days is reduced, the waterlogging co ndition can reduce the carbon flux of winter wheat in the jointing stage, the influence of the surface waterlogging condition is more obvious, and the effect of the water logging condition on the winter wheat carbon flux after the third day is significantly weakened. Moreover, the temperature is another important factor affecting the carbon flux of winter wheat in the jointing stage.T he carbon flux changes with the temperature in cubic curves. Under normal and waterlogging scenarios, the carbon flux of winter wheat reaches the highest point around 7 ℃ . In the case of surface waterlogging , it reaches the highest point around 5 ℃ . T he results of the research can provide scientific evidence for keeping the carbon balance of farmland ecosystems and constructing the ecological irrigated areas.
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