Influence of Different Rice Varieties on Emission of Methane in Soil and Exudation of Carbohydrates in Rhizosphere

벼 품종별 Methane 배출과 뿌리의 탄수화물 분비 특성

  • Lee, Kyeong-Bo (National Honam Agricultural Experiment Station RDA) ;
  • Lee, Deog-Bae (National Honam Agricultural Experiment Station RDA) ;
  • Uhm, Taik-Yong (Hanil University, Faculty of Life and Environmental Science) ;
  • Kim, Jong-Gu (National Honam Agricultural Experiment Station RDA) ;
  • Yoo, Chul-Hyun (National Honam Agricultural Experiment Station RDA) ;
  • Kim, Yong-Woong (Chonnam National University, College of Agriculture)
  • Published : 1997.09.30

Abstract

To find out the influence of different rice varieties on the emission of methane in the soil and the exudation of carbohydrates from root, the experiment was conducted on a fine silty, mesic family of Aeric Fluventinc Haplaquepts (Jeonbug series). The varities of rise involved one early maturing variety of Japonica type(namweon) and three mid-to-late maturing varieties of Japonica type and one mid-to-late variety of Indica${\times}$Japonica crossed. The methane flux over the rice canopy was measured according to the closed chamber method modified by Shin and the methane concentration in the soil was measured using porous cup installed in the soil. The carbohydrate exudates from root were measured under nutrient solution culture. It was found that the methane flux tended to be lower in early maturing varieties than in the mid-to-late maturing varieties, lower in indica${\times}$Japonica crossed variety than in Japonica type varieties. There was positive correlation between the number of tillers and the weight of roots of rice plant and methane flux. The correlation, however, tended to be greater between the weight of roots and methane flux. There was no significant difference in the concentration of methane in the soil under different varieties of rice, excepting one variety, Kehwa under which methane concentration was highest. In case of carbohydrate exudation, early maturing variety tended to be higher than other varieties, although the opposite was the case in methane flux.

Keywords

Methane flux;Rice varieties;Carbohydrate exudation