| Summary: | 碩士 === 國立成功大學 === 生物多樣性研究所 === 100 === Differences in soil physicochemical properties, microbial physiological variables and community structure were investigated in organic and conventional agroecosystems located in Nantou County, central Taiwan. Two series of soil samples from below the tea shrub canopy (TI) and between teas shrubs (TII) were collected monthly during 2011 from each study site. Physicochemical and physiological parameters were analyzed using a two-way ANOVA to determine the impact of farming type and sampling position. Assessment of the relationships between those parameters was performed using the Pearson correlation. The microbial community structure and functional diversity were established based on substrate induced respiration (SIR), which indicates the metabolic potential of the microbial community. Farming type, sampling position and their interaction had a significant impact on physicochemical and physiological variables, whereas functional diversity was not affected by sample position and microbial biomass by their interaction. The results of physiological parameters indicate that organic farming could reduce the metabolic quotient (qCO2) and basal respiration and increase the functional diversity and catabolic ability of the microbial community, especially with amino acids and carbohydrates.
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