오리농업재배 소유역내 자연습지가 오리농업시 유출되는 영양염류 부하량 저감에 미치는 영향

Effects of Natural Wetland in Reducing Nutrient Loadings from Rice Culture - Free-Range Ducks (RCFD) Paddy fields in Korea

  • 고지연 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 이재생 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 정기열 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 최영대 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 윤을수 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 우관식 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 서명철 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 남민희 (농촌진흥청 국립식량과학원 기능성작물부)
  • Ko, Jee-Yeon (Department of Functional Crops, National Institute of Crop Science, Rural Development Administration) ;
  • Lee, Jae-Saeng (Department of Functional Crops, National Institute of Crop Science, Rural Development Administration) ;
  • Jung, Ki-Youl (Department of Functional Crops, National Institute of Crop Science, Rural Development Administration) ;
  • Choi, Young-Dae (Department of Functional Crops, National Institute of Crop Science, Rural Development Administration) ;
  • Yun, Eul-Soo (Department of Functional Crops, National Institute of Crop Science, Rural Development Administration) ;
  • Woo, Koan-Sik (Department of Functional Crops, National Institute of Crop Science, Rural Development Administration) ;
  • Seo, Myung-Chul (Department of Functional Crops, National Institute of Crop Science, Rural Development Administration) ;
  • Nam, Min-hee (Department of Functional Crops, National Institute of Crop Science, Rural Development Administration)
  • 투고 : 2009.07.02
  • 심사 : 2009.07.30
  • 발행 : 2009.08.28

초록

오리농업재배가 이뤄지고 있는 소유역 하류에 위치한 자연습지가 오리농업시 유출되는 영양염류 부하량 저감에 미치는 영향을 평가하였다. 오리농업재배가 이뤄지고 있는 소유역은 논면적이 61.9ha로서 총 논면적의 74%에서 오리농업재배가 이뤄지고 있었으며 하류에 위치한 자연습지의 면적은 5.9ha를 차지하고 있었다. 재배기간 중 오리농업이 이뤄지고 있는 논물의 영양염류 함량을 조사한 결과 T-N 13.7, $T-P2.5kg\;ha^{-1}$로 나타났는데, 이는 동일기간 중 관행재배에 비해 1.2~2.5배 높은 결과였다. 하류에 위치한 자연습지의 우점초생은 갈대, 줄, 고마리 등이었으며, 이들 식생이 함유하고 있는 영양염류량은 T-N 761 kg, T-P103 kg으로서 오리재배논으로부터 유출되는 영양염류 부하량의 94%와 79%에 해당되는 양이었다. 이와 같은 연구결과를 볼 때, 오리재배농업단지 하류에 습지를 유지하는 것은 오리농업 재배시 발생할 수 있는 영양염류 부하량을 저감시킬 수 있는 하나의 방법이 될 수 있으리라 생각된다.

The amount of nutrients from the effluents of rice culture - free-range ducks (RCFD) paddy fields and the effects of natural wetlands located at downstream of RCFD on water quality and aquatic plants was evaluated. This was carried out in a 61.9 ha paddy fields in Ulsan, Gyeongnam, where downstream is a 5.9 ha natural wetland, 61% of which was covered with well-developed aquatic plants. The amounts of T-N and T-P in the effluent from paddy field with RCFD were 13.7 and $2.5kg\;ha^{-1}$, respectively, which is 1.2~2.5 times higher than those observed in conventional rice culture practice. The amount of runoff from the RCFD area, calculated using the revised TANK model, was $543mm\;ha^{-1}$ with 808 kg of T-N and 130 kg of T-P during rice cultivation period. The dominant aquatic plants in the wetland includes Phragmites communis, Zizania latifolia, Persicaria thunbergii. etc. The nutrient contents of the aquatic plants which amounted to 761 kg of T-N and 103 kg of T-P were almost equivalent to 94% and 79% of the T-N and T-P in RCFD and CRC effluent. Therefore, the use and maintenance of wetlands in RCFDs area could be a good solution to management the non-point pollution from duck feces in RCFD paddy fields.

키워드

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