• Title/Summary/Keyword: Denitrification-Decomposition (DNDC) model

Search Result 2, Processing Time 0.016 seconds

Simulation of GHG Emission from Paddy Field using DNDC Model (DNDC를 이용한 논의 온실가스 배출량 모의)

  • Shin, Min Hwan;Jang, Jeong Ryeol;Won, Chul Hee;Jung, Young Hun;Lee, Su In;Lim, Kyoung;Choi, Joong Dae
    • Journal of The Korean Society of Agricultural Engineers
    • /
    • v.56 no.2
    • /
    • pp.47-57
    • /
    • 2014
  • This study was conducted to predict greenhouse gas (GHG) emission from paddy by future climate change scenario in Korea. Chuncheon city in Kangwon province were selected as study area. A1B Special Report on Emission Scenario (SRES) of the IPCC (Intergovernmental panel on climate change) was used to assess the future potential climate change. The rainfall and temperature was projected to increase by 8.4 % and 1.9 % (2040s), 35.9 % and 27.0 % (2060s), 19.2 % and 30.8 % (2090s), respectively, compare to the 2010s value. Under the climate change, Denitrification-Decomposition (DNDC) predicted an increase in $N_2O$, $CO_2$ and $CH_4$ emissions from paddy. The simulations resulted in annual net emissions of 0.4~2.4, 500.5~734.5 and 29.4~160.4 kg/ha/year of $N_2O-N$, $CH_4-C$ and $CO_2-C$, respectively, with a cumulated global warming potential (GWP) of $14.5{\sim}21.7t{\cdot}CO_2/ha/year$ were affected by rainfall, temperature, manure amendment and fertilizer amount. The simulation results suggested that implementation of manure amendment or reduction of water consumption instead of increased fertilizer application rates would more efficiently mitigate GHG emissions.

DNDC Modeling for Greenhouse Gases Emission in Rice Paddy of South Korea and the Effect of Flooding Management Change and RCP 8.5 Scenario (RCP 8.5 시나리오와 관수 기법의 변화에 따른 논에서의 온실가스 배출 변화의 DNDC 모델을 통한 모의)

  • Min, Hyungi;Kim, Min-Suk;Kim, Jeong-Gyu;Hwang, Wonjae
    • Ecology and Resilient Infrastructure
    • /
    • v.5 no.3
    • /
    • pp.189-198
    • /
    • 2018
  • In 21th century, climate change is one of the fundamental issue. Greenhouses gases are pointed as the main cause of climate change. Soil play a vital role of carbon sink and also can be a huge source of greenhouse gases defense on the management. Flux of greenhouse gases is not the only factor can be changed by climate change. Climate change can alter proper management. Temperature change will modify crop planting and harvesting date. Other management skills like fertilizer, manure, irrigation, tillage can also be changed with climate change. In this study, greenhouse gases emission in rice paddy in South Korea is simulated with DNDC model from 2011 - 2100 years. Climate for future is simulated with RCP 8.5 scenario for understanding the effect of climate change to greenhouse gases emission. Various rice paddy flooding techniques were applied to find proper management for future management. With conventional flooding technique, climate change increase greenhouse gases emission highly. Marginal flooding can decrease large amount of greenhouse gases emission and even it still increases with climate change, it has the smallest increasing ratio. If we suppose the flooding technique will change for best grain yield, dominant flooding technique will be different from conventional flooding to marginal flooding. The management change will reduce greenhouse gases emission. The result of study shows the possibility to increase greenhouse gases emission with climate change and climate change adaptation can show apposite result compared without the adaptation.