苏格兰阿伯丁城市土壤的微生物特性研究

STUDY ON MICROBIAL PROPERTIES OF URBAN SOILS IN ABERDEEN CITY, SCOTLAND, UK

在重金属的胁迫下，阿伯丁市城市土壤中微生物特征发生了显著的变化，与农村土相比，微生物基底呼吸作用明显增强，但微生物生物量却显著降低，微生物生理参数C-mic/C-org、qCO-2值明显升高，Biolog数据显示城市土壤对能源碳的消耗量和速度显著升高，而且对能源碳的利用方式发生了改变，但利用效率却明显降低，反映出微生物特性可作为城市土壤环境质量变异的有效指标。

Urban soil research has aroused great attention in recent year s. Previous studies were mainly focused on urban soil physics and chemistry, soi l geography to constrain the source, distribution, transport and deposition of p ollutants such as heavy metals, hazard organic matter, but little work is relate d with soil microbiology. In this paper, the authors report the variation of mic robial features in urban soils as compared with adjacent rural areas. The result s show significant changes in basal respiration rate, microbial biomass and ecop hysiological parameter in the urban environment because of the anthropogenic str ess. Rural soils are obviously large in size of microbial community than urban s oils, as indicated by microbial biomass, but apparently lower in microbial respi ration strength expressed by respiration rates, and also have lower C-mic/C -org and metabolic quotient (qCO-2) values, which gave lower level and sta ble microbial activity in rural soils, thus activating the microorganisms to con sume much more energy carbon but in lower utilization efficiency. So microbial b iosensors can effectively indicate the environmental transition from rural area to urban condition under stress of heavy metal pollution.