Response of Microbial Distribution to Soil Properties of Orchard Fields in Jeonbuk Area
2011
Ahn, B.K., Jeollabuk-do Agricultural Research and Extension Services, Iksan, Republic of Korea | Kim, H.J., Wonkwang University, Iksan, Republic of Korea | Han, S.S., Wonkwang University, Iksan, Republic of Korea | Lee, Y.H., Gyeongsangnam-do Agricultural Research and Extension Services, Jinju, Republic of Korea | Lee, J.H., Chonbuk National University, Jeonju, Republic of Korea
This study was conducted to investigate impacts of soil properties on microbial distribution in Jeonbuk orchard fields. Soil samples were collected from 110 sites cultivated with different fruit plants. The population of aerobic bacteria and fungi and the content of soil microbial biomass carbon (C) were found to increase with increasing silt content in the soils. Different activity of dehydrogenase was not observed among the different textures of soil. Microbial distribution, amount of microbial biomass C, and dehydrogenase activity in the soils were not significantly different among the topographic sites. However, in pear and grape fruit plant fields, coliform group of bacteria was found in relatively higher population, 133.0x10³ CFU g-¹ and 107.4x10³ CFU g-¹, respectively. Microbial groups were simplified and their density was reduced with increasing the cultivation periods of fruit plants. The soil microbial distribution was proportionally correlated with some of soil properties such as soil pH, soil organic matter (SOM) content, and exchangeable Mg content; in particular, the population of Bacillus sp. was proportionally correlated with soil pH and exchangeable Mg content. The amounts of microbial biomass C and the dehydrogenase activity in the soils were significantly correlated with the contents of SOM and exchangeable Ca ion (p less than 0.01).
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