武汉大莲花湖异味化合物日变化及其相关因子分析  

STUDIES ON THE DIURNAL VARIATION OF THE ODOROUS COMPOUNDS AND CORRELATED FACTORS IN LAKE DALIANHUA,WUHAN

作　　者：李林[1] 万能[1] 甘南琴[1] 宋立荣[1] 

机构地区：[1]中国科学院水生生物研究所淡水生态与生物技术国家重点实验室

出　　处：《水生生物学报》2007年第1期112-118,共7页Acta Hydrobiologica Sinica

基　　金：国家"十五"重大科技专项项目(2002AA601021);国家重点基础研究发展规划项目(2002CB41230);中国科学院知识创新工程重要方向性项目(kscx2-1-10)资助

摘　　要：大莲花湖位于武汉市汉阳区莲花湖公园内,是以休闲娱乐为主的景观水体,面积约为64000m2。近年来,该湖不断出现蓝藻水华,每到夏季湖区臭不可闻,损害了莲花湖旅游度假景区的景观生态价值和经济收入。本文对大莲花湖藻类及其异味化合物与环境因子的日变化进行了研究。结果表明,夏季大莲花湖藻类以微囊藻占优势。据GC-MS鉴定,该湖水中存在着2-MIB、-βCyclocitral和-βIonone等3种异味化合物。水中溶解性2-MIB、-βCyclocitral和-βIonone日最高浓度分别可达69.1ng/L3、2.6 ng/L和453.9ng/L,与各自的嗅觉异味阈值浓度比较可知,2-MIB和β-Ionone对该湖异味的类型和强度均有较大影响,分别产生强烈土霉味和腐臭味,而-βCyclocitral对该湖异味的贡献则较小。水中日平均颗粒态的2-MIB、-βCyclocitral和-βIonone分别占各自总含量的70.9%、74.4%和81.4%,说明这3种异味化合物在水中均主要以颗粒态存在。这3种异味化合物的日变化与总藻、微囊藻、鱼腥藻及水面光强日变化相关性分析显示,溶解性、颗粒态、总-βCyclocitral均与总藻、微囊藻日变化显著相关,颗粒态-βCyclocitral和颗粒态-βIonone与总藻及水面光强显著相关,大莲花湖水中颗粒态2-MIB的浓度与鱼腥藻数量有显著相关性。Located in the Park Lianhuahu, Hanyang District, Wuhan, Lake Dalianhua mainly serves as a public recreation landscape and covers an area of about 64000m^2. In recent years, the great damage to the scenic value and economic revenue of Lianhuahu Park have been caused by the frequent outbreak of cyanobacterial bloom and thereby the diffusion of strong off-flavour in the lake. In the paper, the diurnal variation of environmental parameters, algae and odorous compounds in Lake Dalianhua were investigated. The Microcystis was found to be a dominant genus in the lake. The trend of the diurnal variation of biomass of the total algae is the same as that of the dominant algae. Three odorous compounds 2-Methylisoborneol, β-Cyclocitral and β-Ionone in the lake were identified by using a GC-MS. The diurnal highest concentration of soluble 2-Methylisoborneol, β-Cyclocitral and β-Ionone reached 69. lng/L, 32.6ng/L and 453.9ng/L, respectively. Compared the above concentrations with their odor threshold concentrations, it could be concluded that 2-Methylisoborneol and β-Ionone were mainly responsible for the strong off-flavours in the lake. Aaveragely, particulate 2-Methylisoborneol,β-Cyclocitral and β-Ionone accounted for 70.9 % , 74.4% and 81.4 % of its total content, respectively, showing that these particulate odorous compounds were the major components among the odorous components in the lake. All the soluble, particulate and totalβ-Cyclocitral correlated significantly with the biomass of total algae and Microcystis, particulateβ-Cyclocitral and β-Ionone correlated significantly with the biomass of total algae and light intensity, and particulate 2-MIB had a significant correlation with the biomass of Anabaena.

关 键 词：蓝藻 异味 异味化合物 日变化 相关性 

分 类 号：X131.2[环境科学与工程—环境科学]