KSEA's 30th Anniversary International Symposium
284
-OA-06
No-Tillage System can Increase CH4 Emission in Rice Paddy Soil
(벼 논에서 무경운이 메탄 발생 증가에 미치는 영향)
Jessie Gutierrez1* · Sang Yoon Kim1 · Prabhat Pramanik1 · Pil Joo Kim1,2
제시구티어레즈1* · 김상윤1 · 프라밧프라마닉1 · 김필주1,2
1Division of Applied Life Science (BK 21 Program), Gyeongsang National University, Jinju, 2Institute of Agriculture and Life Science, Gyeongsang National University, Jinju
1경상대학교 응용생명과학부 (BK 21 program), 2경상대학교 농업생명과학연구원
The decreasing effect of short-term no tillage practice on methane (CH4) emission has been reported
by many, but CH4 emission increase was found in the long-term no-tillage paddy soil. In this study, we
investigated the effect of a 5-year old no-tillage experimental field on CH4 emission in rice (Oryza sativa L., cultivar Donginbaeyo) paddy using no tillage (NT) and conventional tillage (CT) as control
under same chemical NPK fertilization background. Methane gas samples were collected at the same time twice a week using a closed chamber method. Higher seasonal CH4 flux was observed in NT
treatment at 45.24 gCH4-C m-2 than CT at 17.96 gCH4-C m-2. After investigating the soil chemical and
biological properties that may had stimulated more CH4 emission, we found out organic matter content,
hot water-extractable C (labile C), and total C concentrations in the soil surface (0-15 cm depth), and quantified mcrA genes were significantly and strongly correlated with seasonal CH4 flux, which were
higher in NT compared to CT treatments. No tillage more effectively increased total soil organic carbon (SOC) accumulation by ca. 15% compared with conventional tillage suggesting its effectiveness to sequestrate CO2 from the atmosphere and improve soil physical property but may impact CH4 emission
during rice cultivation. With no tillage system which has the potential to increase SOC in soil, reasonable management strategies to reduce CH4 emission like water control and fertilizer management
could be given due consideration.
Key words : No-tillage, methane, organic matter, hot water-extractable carbon
