Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
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Impacts of Topography on Microbial Community from Upland Soils in Gyeongnam Province

경남지역 밭 토양 지형이 미생물 군집에 미치는 영향

  • Received : 2011.05.16
  • Accepted : 2011.06.10
  • Published : 2011.06.30
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Abstract

The present study evaluated the soil microbial communities by fatty acid methyl ester (FAME) in upland soils at 25 sites in Gyeongnam Province. The total bacteria content was $143nmol\;g^{-1}$ for in inclined piedmont, $75nmol\;g^{-1}$ for fan and valley, $49nmol\;g^{-1}$ for hill areas, and $44nmol\;g^{-1}$ for riversider plain. The fungi content was 2.4 times higher in sandy loam than $21nmol\;g^{-1}$ in silt loam (p<0.01). In addition, inclined piedmont soils had a significantly higher ratio of monounsaturated fatty acids to saturated fatty acids compared with fan and valley soils (p<0.05). The communities of total bacteria and arbuscular mycorrhizal fungi in the inclined piedmont soils were significantly higher than those in the fan and valley soils and in the riversider plain soils (p<0.05), whereas the community of fungi was significantly lower (p<0.05). In principal component analyses of soil microbial communities, our findings showed that inclined piedmont was positive relationship with total bacteria and actinomycetes in upland soils.

경남지역 밭 토양 25개소를 대상으로 2009년에 미생물 세포벽 지방산 함량을 분석하여 미생물 다양성을 지형, 토성 및 작물별 주요 변동요인을 주성분분석으로 해석하였다. 총 세균 함량은 산록경사지가 $143nmol\;g^{-1}$으로 곡간 및 선상지 $75nmol\;g^{-1}$에 비해 1.9배, 구릉지 $49nmol\;g^{-1}$와 하성평탄지 $44nmol\;g^{-1}$ 보다 3배 정도 높았다 (p<0.05). 토성에 따른 곰팡이 함량은 사양토에서 51$nmol\;g^{-1}$으로 미사질양토 $21nmol\;g^{-1}$에 비해 유의적으로 높았다 (p<0.05). 불포화지방산과 포화지방산의 비율은 산록경사지에서 0.85로 곡간 및 선상지 0.66 보다 유의적으로 높았으며 (p<0.05) 하성평탄지가 0.79, 구릉지가 0.68을 나타냈다. 밭 토양 평균 미생물 군집은 총 세균이 30.3%, 곰팡이 17.4%, 그람음성 세균은 13.7%, 그람양성 세균은 13.8%, 내생균근균 2.7%, 방선균 1.9%의 비율이었다. 산록경사지에서 총 세균 군집은 32.8%로 가장 높았으며 곡간 및 선상지 29.8% 및 하성 평탄지 29.5%에 비해 유의적인 차이가 있었으며 (p<0.05) 내생균근균 군집도 5.3%로 하성평탄지 3.0%, 구릉지 2.5%, 곡간 및 선상지 2.1%에 비해 유의적으로 높았다 (p<0.05). 그러나 곰팡이 군집은 13.4%로 하성평탄지 18.6%, 곡간 및 선상지 18.2%, 구릉지 16.9%에 비해 유의적으로 낮았다 (p<0.05). 미사질양토는 방선균 군집이 2.2%로 사양토 1.8%에 비해 유의적으로 높았으며 (p<0.05) 곰팡이 군집은 사양토에서 20.4%로 양토 16.4%와 미사질양토 15.4%에 비해 유의적으로 높았다 (p<0.05). 작물에 따라 방선균 군집은 콩에서 2.2%로 감자 1.6%에 비해 유의적으로 높았으나 (p<0.05) 다른 미생물 군집은 유의적인 차이가 없었다. 주성분 분석결과 제1주성분이 42.1%, 제2주성분이 23.5%로서 전체 65.6%의 자료를 설명할 수 있는 것으로 나타났다. 제1주성분은 그람음성 세균 군집이 가장 크게 기여하였으며 내생균근균, 그람음성 세균과 그람양성 세균 비율 순으로 정의 기여를 하는것으로 나타났다.

Keywords

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