RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2012, Vol. 21 >> Issue (05): 578-.

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EFFECTS OF NITROGEN APPLICATION ON GLOBAL WARMING POTENTIALS IN RICEWHEAT ROTATION SYSTEM

LI Xiaoli, WEI Linglin, LI Xiuming, WANG Wei   

  1. (State Key Laboratory of Bioreactor Engineering,East China University of Science and Technology,Shanghai 200237,China
  • Online:2012-05-20

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Abstract:

This paper studied the effects of different nitrogen levels on crop yield and global warming potential through DenitrificationDecomposition Model (DNDC) model and a farm automatic sampling system.The results showed that DNDC model was well applied to simulate the greenhouse gas emissions.There was no significant increase of crop yield with the increase of N fertilizer between the normal usages of 80 percent to 150 percent.There was an optimization unit crop yield Global Warming Potential(GWP),when the nitrogen application rate was reduced to 6298 percent of the normal usages,with crop yield 12 877.5 kg/(hm2〖DK〗·a) and 3670 percent reduction of GWP.This study showed that reducing the amount of nitrogen reasonably can bring down the greenhouse gas emissions of wheat rotation system at the Lower Reaches of the Yangtze River,and reduce the global warming potentials per kilogram crop yield

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