【摘要】 微生物在人工湿地污水净化过程中发挥着重要作用,微生物生物量碳是微生物的重要表征之一.为探讨人工湿地土壤微生物量碳与污水净化效果的关系,以表面流人工湿地为研究对象,分别研究了不同植物人工湿地土壤微生物生物量碳和净化效果的时空变化及其相关性.结果显示,4种植物湿地表层(0-5 cm)微生物生物量碳极显著高于深层(15-20 cm)的测量值(P<0.01).人工湿地污染物去除效果与微生物生物量碳具有相同的季节变化规律,都呈单峰型的季节格局,夏秋季较高,冬春季较低.微生物生物量碳与人工湿地COD、BOD5和TN的去除呈显著正相关(P<0.05).水鬼蕉湿地具有较高的微生物生物量碳,而污染物去除率一般较低,这表明不同湿地微生物生物量碳与污染物去除率的相关性呈现不确定性.更多还原

【Abstract】 Soil microorganisms are involved in all the biochemical processes which occur in soils,and they play a vital role in wastewater purification.Microbial biomass carbon is an important indicator of soil fertility,so we guess it is probably closely related to wastewater purification.For understanding whether relationship between nutrient removal rates and microbial biomass carbon existed,monoculture constructed wetlands of four plant species(Phragmites australis Trin.ex Steud.,Hymenocallis littoralis(Jack.) Salisb.,Canna indica Linn.,Cyper u s f labellifor mis Rot tb.) were built,and during a 2-month period,microbial biomass carbon and nutrient removal rates were measured.The results indicated that microbial biomass carbon in surface soil(0-5 cm) was significantly higher(P<0.01) than that in the deeper soil(15-20 cm).Both microbial biomass carbon and nutrient removal rates were higher during summer and autumn and lower during spring and winter.The removal rates of COD,BOD5 and total nitrogen were significantly correlated with microbial biomass carbon(P<0.05).In addition,microbial biomass carbon was generally higher while nutrient removal rates were generally lower in H.littoralis wetland than in the other wetlands,suggesting microbial biomass carbon may not be proposed as a sensitive indicator for evaluating nutrient removal in constructed wetlands.更多还原