Effects of human activities on soil properties and bacterial community in Yaoquanshan of the Wudalianchi Scenic area, China

摘要

Traditional microbial culture was used to qualitatively and quantitatively analyze the bacterial community which was sampled from the active, buffer and background regions of the top, side and foot of the Yaoquanshan mountain to investigate the effects of human activities on the soil properties and bacterial community structure, response of bacterial community structure to the soil chemical properties and enzyme activity. The results showed that altitude was the main reason in differential bacterial population distribution in Yaoquanshan soil, followed by human activity disturbance. The bacterial community structure showed little difference at the same altitude. The isolation frequencies of Bacillus, Micrococcus and Proteus decreased with increased human activities, while those of the Enterobacter, Lactobacillus, Aeromonas and Azotobacter presented an elevating trend. Bacillus was the dominant genera in the soil from all the sampling points, having an isolation frequency of 17.78 - 68.97%. Activities of total phosphorus and catalase had relatively greater effect on the bacterial community distribution, followed by sucrase, cellulase and organic matter. The Proteus was positively correlated with the total phosphorus content when it was in the range of 1.49 ± 0.39 ~ 1.80 ± 0.26 g/kg. The Kluyvera in the soil from active area of mountain-top was positively correlated with the sucrase. This study demonstrates that massive human activities to some extent might have effects on soil properties, bacterial population and bacterial community structure in Yaoquanshan mountain, China.