Effects of urbanization on the quantity changes of microbes in urban-to-rural gradient forest soil | 城市化对城乡梯度森林土壤微生物数量变化的影响
2010
Zhao Zhexia, Nanchang University, Nanchang (China), College of Life Sciences and Food Engineering | Guo Huicai, Nanchang University, Nanchang (China), College of Life Sciences and Food Engineering
Three typical rural-suburban-urban artificial wetlands Pinus elliottii forest in Nanchang City were selected as research objects to mensurate the soil nutrient content. And the annual average values and seasonal changes of microbes in forest soil were analyzed. The results showed that soil bulk density, total phosphorus (TP) and pH increased, while soil organic carbon (SOC), total nitrogen (TN) declined with rural-to-urban gradient. At different eco-boundary, annual average values showed that actinomycetes quantity bacteria quantity fungi quantity. Total microbe number was urban suburb rural areas. The number of bacteria and fungi was urban suburbs rural areas, but the number of actinomycetes was suburb urban rural areas. Eco-boundary, season and microbes actinomycetes and fungi reached an extreme significant level (P 0.001). Bacteria in soil at different eco-boundary had significant effects, but season had no significant effect on bacteria. Eco-boundary and season had a very significant interaction on actinomycetes and fungi (P 0.001), but they had no significant interaction on bacteria (P 0.05). Eco-boundary showed significantly positive correlation with actinomycetes and fungi (P 0.001), but season had no significant corelation with microbes. In conclusion, urbanization process caused the physical-chemical properties changes of forest soil and affected the amount of soil microbes obviously.
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