【作者】 李培培； 史文； 刘其根； 余元龙； 何光喜； 陈来生； 任丽萍； 洪荣华；

【Author】 Li Pei-pei1,Shi Wen1,Liu Qi-gen1,Yu Yuan-long1,He Guang-xi2, Chen Lai-sheng2,Ren Li-ping2,Hong Rong-hua2 (1:Key Laboratory of Aquatic Genetic Resources and Utilization,Ministry of Agriculture,Shanghai 201306,P.R.China ) (2:Hangzhou Qiandaohu Development Co.,ltd.,Chun’an 311700,P.R.China)

【机构】 上海海洋大学农业部水产种质资源与利用重点开放实验室； 浙江杭州千岛湖发展有限公司；

【摘要】 根据2007年1月-2009年12月对千岛湖河流区、过渡区和湖泊区5个采样点叶绿素a及其他10个理化水质指标进行每月定期采样及监测,分析了叶绿素a的时空分布格局及其与主要环境因子的相关性。结果表明,全湖叶绿素a年均含量以2008年最高,2009年次之,2007年最低。上游河流区和过渡区叶绿素a含量存在明显的季节变化,其共同特点是每年会形成春季和夏末秋初的双高峰。河流区叶绿素a含量明显高于中下游区(过渡区和湖泊区)。从垂直分布情况来看,叶绿素a含量的最高峰通常出现在4-12 m,最深出现在20 m,春夏季出现明显分层。千岛湖叶绿素a与总氮(TN)、水温(WT)和硅酸盐(SiO32-)呈低度相关,与其他环境因子特别是总磷(TP)无显著相关性。多元逐步回归分析结果显示,千岛湖叶绿素a(Chla)与筛选出的几个关键的环境因子之间的回归方程为:Chla=0.1 14 WT+2.120 CODMn+17.157 SiO3 2--37.39 NO2-N-1.946(R2=0.445,P<0.05)。更多还原

【Abstract】 The temporal and spatial distribution patterns of chlorophyll a and its correlation with the main environmental factors were analyzed according to the monthly investigation from January,2007 to December,2009 in Lake Qiandaohu.Results showed that the annual average concentration of chlorophyll a reached the highest in 2008,and the lowest in 2007. The concentration of chlorophyll a in sampling stations located in the riverine and transitional zone of the reservoir showed a significant seasonal variations with two peak concentrations occurred in spring and late summer or early fall,respectively.The concentrations of chlorophyll a in upstream sites(in the riverine and transitional zones) were significantly higher than those of downstream sites.The chlorophyll a during the warm season usually stratified with peak concentration occurring at depths of 4 m to 12 m,and occasionally at a depth of 20 m.The result of correlation analysis showed a weak correlation between chlorophyll a and TN, water temperature(WT) and silicate(Si032～),while no significant correlations were found between the chlorophyll a and other environmental factors,especially the TP in the water.更多还原