Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
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Comparison of Soil Microbial Communities to Different Practice for Strawberry Cultivation in Controlled Horticultural Land

시설 딸기의 재배방법에 따른 토양 미생물군집 비교

  • Min, Se-Gyu (Goseong-Gun Agricultural Development Technology Center) ;
  • Park, Su-Seon (Rural Development Administration) ;
  • Lee, Young-Han (Gyeongsangnam-do Agricultural Research and Extension Services)
  • Received : 2011.05.13
  • Accepted : 2011.06.09
  • Published : 2011.06.30
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Abstract

Fatty acid methyl ester (FAME) profiles were used to describe differences in soil microbial communities influenced by conventional farming system (CFS), conventional farming system without pesticides (CFSWP), and organic farming system (OFS) for strawberry cultivation in controlled horticultural land. In comparison to the CFS soils, the average soil microbial biomasses of in the OFS soils were approximately 1.2 times for total FAMEs ($195nmol\;g^{-1}$), 1.4 times for total bacteria ($58nmol\;g^{-1}$), 1.5 times for Gram-negative bacteria ($27.3nmol\;g^{-1}$), 1.2 times for Gram-positive bacteria ($26.1nmol\;g^{-1}$), and 1.5 times for actinomycetes ($2.8nmol\;g^{-1}$). The microbial communities of total bacteria (p<0.05) and Gram-negative bacteria (p<0.05) in the OFS and CFSWP soils were significantly higher larger than those in the CFS soils. However, fungal structure was significantly greater in CFS than in OFS and CFSWP (p<0.05). In principal component analyses of soil microbial communities, our findings suggest that actinomycetes should be considered as potential factor responsible for the clear microbial community differentiation observed between OFS and CFS in controlled horticultural land.

시설 딸기 유기재배, 무농약재배 그리고 관행재배 방법이 토양 미생물 생태계의 변화에 미치는 영향을 FAME 분석으로 검토하였다. 유기재배는 관행재배에 비해 총 FAME 함량은 1.2배, 총 세균 함량은 1.4배, 그람음성 세균은 1.5배, 그람양성 세균은 1.2배, 방선균 함량은 1.5배 높았다 (p<0.05). 미생물 군집은 유기재배와 무농약재배가 관행재배에 비해 총 세균 및 그람음성 세균의 군집비율이 높은 반면, 곰팡이 군집비율은 낮았다 (p<0.05). 주성분 분석결과 주성분 PC1은 50.9%, 주성분 PC2는 30.5%로 관행재배, 무농약재배 및 관행재배의 미생물 군집에 대한 유의적인 차이를 보였으며 방선균 군집비율은 유기재배에 대한 지표로서 나타났다. 무농약재배는 토양 염류가 높아 cy19:0과 18:$1{\omega}7c$ 비율은 1.27로 높았으며 불포화지방산과 포화지방산의 비율은 0.56로 낮게 나타났다 (p<0.05). 따라서 미생물의 다양성을 유지하고 스트레스를 경감시킬 수 있는 방법으로 토양 양분을 적정수준으로 관리하는 것이 무엇보다 중요한 것으로 판단되었다.

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