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Changes of methane flux and methanotroph and methanogen abundances in a temperate mono rice paddy soil : 온대 논토양에서 메탄생성 및 산화균의 량과 메탄 배출의 변화 원문보기

  • 저자

    권효숙

  • 학위수여기관

    경상대학교 대학원

  • 학위구분

    국내석사

  • 학과

    응용생명과학부

  • 지도교수

  • 발행년도

    2014

  • 총페이지

    iv, 29 p.

  • 키워드

    methane paddy soil fallow season cover crop methanogens methanotrophs;

  • 언어

    eng

  • 원문 URL

    http://www.riss.kr/link?id=T13534180&outLink=K  

  • 초록

    우리나라 논 토양의 일반적인 관리유형인 건답 휴경기와 습답 벼 재배기의 온실가스 메탄의 산화 및 배출특성을 평가하고 이와 관련 있는 메탄산화균(methanotrophs)과 메탄생성균(methanogens)의 활성과 다양성 변화를 조사하여 다음과 같은 결과를 얻었다. 1. 휴경기 건답에서 본격적 강우가 시작되기 이전인 4월말까지는 평균 4.1 kg ha-1의 메탄이 산화되어 소멸되었으며, 피복작물 보리와 헤어리베치 재배를 통해 메탄 산화량을 약 1.8배 증진시킬 수 있었다. 강우량이 많아지는 5월 이후부터는 건답조건에서도 토양 관리유형과 관계없이 메탄이 배출되기 시작하였다. 2. 하절기 담수상태에서 화학비료(NPK)를 사용하여 벼를 재배하는 과정 중 64.8 kg ha-1의 메탄이 배출되었으며, 피복작물 보리와 헤어리베치를 녹비로 활용하여 화학비료를 대체하였을 때 메탄 배출량이 약 6.9-8.8 배 이상 증가하였다. 휴경기 피복작물 재배를 통해 증가된 토양의 메탄 산화력은 벼논의 메탄 배출량 저감에 미치는 영향성은 대단히 미미하였다. 3. 휴경기 건답 토양에서의 메탄산화균 및 메탄생성균 활성은 상대적으로 대단히 미미하였으며, 습답에서 벼를 재배하는 과정 중 메탄의 배출양상과 유사하게 두 미생물의 활성이 크게 증가하였다. 화학비료 처리구에 비해 녹비환원 처리구에서 두 미생물의 활성이 크게 증가하였다. 건답과 습답 토양조건과 관계없이 메탄산화균 중 Type II Methylomicrobium와 Type I Methylobacter가 우점하였으며, 벼 재배기간 중 메탄배출량이 가장 많았던 유수형성기 Methylomicrobium가 메탄산화균의 80%까지 우점하였다.


    The temperate mono rice paddy fields are typically flooded for less than 100 days a year during rice cropping season, and kept under the dried soil condition during the fallow season over 200 days a year. The methane (CH4) uptake is expected by methanotrophs during the dried fallow season, but CH4 flux from paddy soil is generally evaluated only during rice cultivation without considering oxidized CH4 flux during the fallow season. In this study, the fluxes of CH4 emission and oxidation, along with methanotrophs and methanogens properties, were investigated in a typical rice paddy soil during two seasons. Mean -8.42 kg ha-1 day-1 of CH4 was oxidized to April, before the raining season, in the dried soil during the fallow season, and cover cropping like barley and hairy vetch significantly increased soil CH4 uptake by 1.3-2.2 times over the control. Thereafter, CH4 emission was significantly increased even in the dried soils, mainly due to more frequent raining, and temperature rising. Seasonal CH4 flux was 64.9 kg ha-1 in the NPK during rice cultivation, and cover crop biomass incorporation as a green manure significantly increased CH4 flux 6.9-8.8 times over the NPK. However, the improved CH4 uptakes by cover cropping during the fallow season covered less than 1% of seasonal CH4 flux during rice cultivation and did not deplete annual CH4 flux. The abundances of methantrophs and methanogens were comparatively very low during the fallow season and then significantly increased with rice cultivation. Higher abundances of methantrophs and methanogens were observed in higher CH4 emission plots during rice cultivation. Irrespective with the dried and flooded soil conditions, type II Methylomicrobium were dominant among methanotrophs ranged 20-80% of total community. In particular, relative abundance of type II Methylomicrobium increased to 80% at the peak CH4 emission stage during rice cultivation. In conclusion, the CH4 uptakes of the dried soils during the fallow season were negligible levels against CH4 emission during the flooded rice cultivation. Therefore, proper soil management strategy needs to develop for decreasing CH4 emission during the flooded rice cultivation season, not to increase soil CH4 uptake potential during the fallow season in mono-rice paddy fields.


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