城市化对城乡梯度森林土壤微生物数量变化的影响（英文）

选取南昌市＂农村-郊区-城市＂3块人工湿地松林典型样地作为研究对象,测定其土壤养分含量,分析了森林土壤微生物数量年均值和季节性变化。结果表明：土壤容重、全P、pH值表现为增加的趋势,有机C、全N呈下降的趋势;在不同的生态界面年均值都表现为放线菌数量〉细菌数量〉真菌数量,微生物总数为城市〉郊区〉农村,细菌与真菌数量为城市〉郊区〉农村,放线菌数量为郊区〉城市〉农村;生态界面、季节与微生物放线菌和真菌显著性均达到极显著水平（P〈0.001）,在不同生态界面土壤中细菌具有显著作用,但季节对细菌无显著影响;生态界面和季节对放线菌、真菌具有极明显的交互作用（P〈0.001）,而对细菌无显著交互作用（P〉0.05）;生态界面与放线菌、真菌呈极显著正相关关系（P〈0.001）,但季节与微生物无显著相关。总体看来,城市化进程既引起了森林土壤理化特性的变化,又使土壤微生物数量受到明显的影响。

Effects of Urbanization on the Quantity Changes of Microbes in Urban-to-rural Gradient Forest Soil

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.