초록

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산림, 밭, 초지, 논 토양의 두 깊이(0~2cm, $50{\pm}1cm$)에서 계절별로 채취한 토양 시료로부터 서로 다른 방선균주를 분리, 동정하여 계절별 토양 방선균의 속 다양성을 조사하였다. 토양 표층에 분포하는 Streptomyces속 방선균주의 계절별 변동율은 논(18%)과 산림(18%) 토양에 비해 초지(41%)와 밭(39%) 토양에서 더 높게 나타났으며 $50{\pm}1cm$깊이에서는 논(36%), 밭(28%), 초지(26%), 산림(16%) 토양 순으로 높게 나타났다. 한편 희소 방선균의 계절별 분포 변동율을 토양 표층의 경우 논 토양(26%)을 제외하고는 모두 45%이상이었으나 $50{\pm}1cm$깊이에서는 산림(79%), 논(36%), 밭(24%), 초지(10%) 토양 순으로 높게 나타났다. 따라서, 토양 중에 분포하는 방선균의 속 다양성은 계절 변화에 의지하며 또한 이는 방선균군의 종류, 토양의 유형, 그리고 토양 깊이에 의해서 영향을 받을 것으로 고려된다.

Abstract ▼ AI-Helper

From soils seasonally collected at two depths (0~2 cm, $50{\pm}1cm$) of forest, field, grass land, or paddy field, distinct strains of actinomycetes were isolated and identified to the genus level. The genus-diversity of soil actinomycetes was revealed to be considerably different by seas...

From soils seasonally collected at two depths (0~2 cm, $50{\pm}1cm$) of forest, field, grass land, or paddy field, distinct strains of actinomycetes were isolated and identified to the genus level. The genus-diversity of soil actinomycetes was revealed to be considerably different by seasonal change. It was also affected by soil depths, soil types, or actinomycete groups. At the soil depth of 0~2 cm, the seasonal distribution fluctuation (%) of streptomycete strains was higher in grass land (41%), field (39%) soil than paddy field (18%), or forest (18%), whereas that of streptomycete strains at the soil depth of $50{\pm}1cm$ was high in order of paddy field (36%), field (28%), grass land (26%), and forest (16%). On the other hand, the seasonal distribution fluctuation ratio of rare actinomycete strains at the soil depth of 0~2 cm was above 45% except for paddy field (26%). At the soil depth of $50{\pm}1cm$, the seasonal distribution of rare actinomycete strains exhibited high fluctuation (%) in order of forest (79%), paddy field (36%), field (24%), and grass land (10%).

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