Methane Emission among Rice Ecotypes in Korean Paddy Soil

논 토양에서 벼 기상생태형별 $CH_4$ 배출양상 및 배출량 추정

  • Lee, Kyeong-Bo (National Honam Agricultural Experiment Station RDA) ;
  • Lee, Deog-Bae (National Honam Agricultural Experiment Station RDA) ;
  • Lee, Sang-Bok (National Honam Agricultural Experiment Station RDA) ;
  • Kim, Jong-Gu (National Honam Agricultural Experiment Station RDA) ;
  • Kim, Yong-Woong (Chonnam National University, College of Agriculture)
  • Published : 1999.03.31

Abstract

This study was conducted to investigate methane emission among rice ecotypes in paddy soil (Jeonbug series). The varieties of rice involved early maturing short-grain variety, Samcheonbyeo, middle maturing variety, Hawsungbyeo and late maturing variety, Dongjinbyeo. The seasonal change of methane flux was high from ear formation stage to heading stage. It was found that the methane flux was tended to be lower in early maturing variety than in the mid-to-late maturing variety. The plots without rice straw reduced methane emission as much as 46% relative to rice straw application. The methane emission rate through rice stem was highly correlated with temperature fluctuation. Methane emission on ecotypes by rice straw application was 0.394 g $m^{-2}day^{-1}$ in early maturing variety (Samcheonbyeo), 0.407 g $m^{-2}day^{-1}$ in mid maturing variety(Hawsungbyeo), 0.411 g $m^{-2}day^{-1}$ in late maturing variety(Dongjinbyeo).