摘要
测定了武汉东湖污染负荷不同的3个点位(污染负荷为3号>2号>1号)柱状沉积物中异化性硝酸还原酶(dNaR)活性以及硝酸盐还原菌数量、TOC、TN、NO3--N的垂向变化,分析了dNaR活性与硝酸盐还原菌数量、TOC、TN、NO3--N的相关性.结果表明,不同点位沉积物中dNaR活性不同,污染负荷最高的3号点位dNaR活性最高,污染负荷最低的1号点活性最低.不同点位沉积物中dNaR活性在垂向分布上具有相似特征:0～15cm沉积物中活性较大,15cm以下随着深度的增加,酶活性迅速降低.硝酸盐还原菌数量在垂向分布上随着深度的增加而减小.dNaR活性与TOC、TN不具有相关性,而与NO3--N呈正相关(P<0.05);dNaR活性与硝酸盐还原菌数量呈显著性相关(P<0.01).
Sediment cores in 3 different sites in Lake Donghu were sampled.And the vertical variation of dissimilatory nitrate reductase（dNaR） activity,nitrate reducer populations,as well as the contents of TOC,TN and NO3--N in sediments were determined.The results showed that the activity of dNaR varied with different sites.The highest activity of dNaR occurred at site III where the pollution load was the highest,and the lowest activity occurred at site I with lowest pollution load.However,the vertical variation patterns of dNaR activity in 3 sites were similar：the top layer of 0cm～15cm showed higher activity,then the activity decreased acutely with the increase of depth below the layer of 15cm.As to Nitrate reducer populations,the quantity kept decreasing with the depth in all 3 sites.Furthermore,the results of statistic analysis revealed that the activity of dNaR was positive correlated to the contents of NO3--N and nitrate reducer（P0.01） populations（P0.05）,but not correlated to the contents of TOC and TN.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2010年第2期228-232,共5页
China Environmental Science
基金
国家"973"项目(2009CB118705)
关键词
异化性硝酸还原酶
硝酸盐还原菌
垂向分布
沉积物
东湖
dissimilatory nitrate reductase
nitrate reducer
vertical variation
sediment
Lake Donghu
