Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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$N_2O$ Emissions on the Soil of Alpine Wetland by Temperature Change

온도 변화에 따른 산지습지 토양의 $N_2O$ 배출 양상

  • Kim, Sang-Hun (Department of Life Science, Kyungpook National University) ;
  • Lim, Sung-Hwan (Department of Life Science, Kyungpook National University) ;
  • Choo, Yeon-Sik (Department of Life Science, Kyungpook National University)
  • Received : 2013.07.31
  • Accepted : 2013.09.10
  • Published : 2013.09.30
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Abstract

Global warming due to climate change is a problem facing the entire world. Several factors, such as $CO_2O$ concentration, level of warming, soil temperature, precipitation, water content of soil and denitrification by denitrifying bacteria influence the emission of nitrous oxide ($N_2O$) from soil. In this study, we investigated nitrous oxide emissions from the soil of two wetlands, Jilmoineup in Mt. Odae and Moojechineup in Mt. Jungjok, according to temperature change. Soil collected in Jilmoineup in July showed increasing $N_2O$ emissions as temperature increases, but did not show any significant differences at $10^{\circ}C$ (p<0.05). Soil of $15^{\circ}C$ and $20^{\circ}C$ showed increasing pattern of $N_2O$ emissions until 24 h. After that, however, there was no difference in temperature. Overall, $N_2O$ emissions showed significant differences according to temperature (p<0.05). Soil collected from Moojechineup in July showed increasing $N_2O$ emissions according to temperature increase, but did not show any significant differences at $10^{\circ}C$ (p<0.05) as was the case for Jilmoineup soil. On the other hand, two wetland soils showed a slight increase of $N_2O$ emissions by additional nitrogen supply, but did not show any significant differences in the presence of nitrogen or between nitrogen sources. In conclusion, increasing temperature the wetland soil increased the emission of $N_2O$, which is a known greenhouse gas. In order to more clearly identify $N_2O$ emissions, various subsequent studies such as the influence and correlation of several factors are required.

최근 기후변화에 따른 지구온난화는 전세계적으로 매우 큰 문제로 인식되고 있다. 이산화탄소의 농도, 온난화정도, 토양 온도, 강우량, 토양수분함량, 탈질작용 등과 같은 요인들은 토양으로부터 아산화질소 ($N_2O$)의 방출에 영향을 미치는 것으로 알려져 있다. 본 연구에서는 산지습지인 오대산 질뫼늪과 정족산 무체치늪 토양으로부터 온도변화에 따른 $N_2O$ 발생을 조사하였다. 7월 채취한 질뫼늪 토양은 온도가 증가함에 따라 $N_2O$ 발생이 증가하였으나 $10^{\circ}C$에서는 유의한 차이를 보이지 않았다. $15^{\circ}C$와 $20^{\circ}C$ 토양은 24시간까지는 증가하는 $N_2O$ 발생양상을 보였으나 그 이후 발생량의 뚜렷한 차이를 보이지 않았다, 전반적으로 온도처리에 따른 유의한 차이만을 보였다. 무제치늪 토양 또한 질뫼늪 토양과 유사한 경향을 보였다. 부가적인 질소원 처리에 대해 두 습지 토양은 다소 증가하는 양상을 보였으나 질소부가나 질소원에 따른 유의한 차이를 보이지 않았다. 결론적으로 이탄토양으로부터 배출하는 $N_2O$의 양은 온도가 상승함에 따라 증가되는 양상을 보였으나 질소원의 종류와 부가량은 $N_2O$ 배출 양상에 큰 차이를 보이지 않은 것으로 조사되었다. 향후 산지 이탄습지 토양의 $N_2O$ 배출양상을 보다 명확히 규명하기 위해서는 질소원의 차이, 질소의 시비, 토양효소 활성이나 질화세균의 활동성을 포함하여 다양한 요인에 대한 복합적인 연구가 진행될 필요가 있을 것이다.

Keywords

References

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