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China’s rice field greenhouse gas emission under climate change based on DNDC model simulation.

TIAN Zhan1,2, NIU Yi-long1,2, SUN Lai-xiang3, LI Chang-sheng4, LIU Chun-jiang4, FAN Dong-li1   

  1. (1Shanghai Institute of Technology, Shanghai 201418, China; 2Shanghai Climate Center, Shanghai 200030, China; 3International Institute of Applied System Analysis, Laxenburg A2361, Austria; 4Shanghai Jiaotong University, Shanghai 200240, China)
  • Online:2015-03-18 Published:2015-03-18

Abstract: In contrast to a large body of literature assessing the impact of agriculture greenhouse gas (GHG) emissions on climate change, there is a lack of research examining the impact of climate change on agricultural GHG emissions. This study employed the DNDC v9.5, a stateofart biogeochemical model, to simulate greenhouse gas emissions in China’s ricegrowing fields during 1971-2010. The results showed that owing to temperature rising (on average 0.49 ℃ higher in the second 20 years than in the first 20 year) and precipitation increase (11 mm more in the second 20 years than in the first 20 years) during the rice growing season, CH4 and N2O emissions in paddy field increased by 0.25 kg C·hm-2 and 0.25 kg N·hm-2, respectively. The rising temperature accelerated CH4 emission and N2O emission increased with precipitation. These results indicated that climate change exerted impact on the mechanism of GHG emissions in paddy field.