CAJ | 학술논문

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鼍、TOC、TN、NO_3~- -N的垂向变化,分析了dNaR活性与硝酸盐还原菌数量、TOC、TN、NO_3~- -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NO_3~- -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).
측정료무한동호오염부하불동적3개점위(오염부하위3호>2호>1호)주상침적물중이화성초산환원매(dNaR)활성이급초산염환원균수타、TOC、TN、NO_3~- -N적수향변화,분석료dNaR활성여초산염환원균수량、TOC、TN、NO_3~- -N적상관성.결과표명,불동점위침적물중dNaR활성불동,오염부하최고적3호점위dNaR활성최고,오염부하최저적1호점활성최저.불동점위침적물중dNaR활성재수향분포상구유상사특정:0～15cm침적물중활성교대,15cm이하수착심도적증가,매활성신속강저.초산염환원균수량재수향분포상수착심도적증가이감소.dNaR활성여TOC、TN불구유상관성,이여NO_3~- -N정정상관(P<0.05);dNaR활성여초산염환원균수량정현저성상관(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 NO_3~- -N in sediments were determined. The results showed that the activity of diNaR 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 1 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 NO_3 ~- -N and nitrate reducer (P<0.01) populations (P<0.05), but not correlated to the contents of TOC and TN.