본 연구는 상승온도가 벼재배나 볏짚 및 요소 투입과의 복합작용을 통해 토양미생물에 미치는 영향에 대한 평가를 하였다. 상승온도에 의해 토양이화학성이 부분적으로 영향을 받았으며, 이러한 환경변화는 토양미생물에 간접적인 영향을 줄것으로 판단된다. 온도가 전체 토양미생물 밀도에 미치는 효과는 크지 않았으며, 방선균만 온도의 증가로 감소하였기 때문에 미생물 군집구성이 온도변화에 의해 부분적으로만 영향을 받았다는 것을 보여준다. 또한, 벼 재배에 의해 전체PLFA 수치가 1.3배 증가하였다는 것은 식물이 토양미생물에 크게 영향을 미칠 수 있는 인자라는 것을 의미한다. 따라서 이러한 미생물 밀도 및 군집 변화가 물질순환이나 토양의 기능성에 미치는 영향에 대한 추가적인 검토가 필요할 것으로 생각된다.

BACKGROUND: Our study aims to investigate the impact of temperature on the abundance and structure of soil microbial community in a temperature gradient tunnel. METHODS AND RESULTS: To investigate the interaction between temperature and input of C and N, rice straw and urea were applied to the study plots, respectively. We also studied the impact of plants by comparing plots cultivated with rice and unplanted plots. Soil microbial response was measured using the phospholipid fatty acid (PLFA) analysis. Soil chemical properties, including pH and ammonia and phosphate concentrations were influenced by warming and material addition. Microbial PLFA was partially influenced by material inputs, and actinomycetes PLFA was decreased by warming. In cultivated rice plots, an increase in the carbon to nitrogen ratio illustrated the effect of plant on microbiota caused by carbon addition through the root residues. Results from the principal component analysis of PLFA data showed that warmed and control plots applied with rice straw could be separated by principal component analysis. CONCLUSION: Our results suggest that plant influence both the microbial community structure and abundance, and temperature change has a minimal impact on soil microorganisms in flooded soil.