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OALib Journal期刊
ISSN: 2333-9721
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长江中下游湖泊沉积物酶活性及其与富营养化的关系
DOI: 10.3724/SP.J.1145.2011.00196, PP. 196-201
Keywords: 湖泊沉积物,酶活性,微生物,富营养化,长江中下游clcx524
Abstract:
为揭示富营养化湖泊沉积物营养物分解合成过程的生物化学机制，研究了长江中下游6个浅水湖泊沉积物氮、磷、有机质和铵氮含量，水解酶、氧化还原酶活性，微生物种类与数量及之间的关系.结果表明：大通湖、珊珀湖、赛城湖和军山湖等养殖型湖泊，污染严重，其沉积物脲酶活性明显高于污染程度轻的大型湖泊鄱阳湖和洞庭湖，且与沉积物总氮（tn）、有机质（om）含量呈极显著正相关（r=885，p<0.01；r=0.900，p<0.01）；沉积物碱性磷酸酶（apa）活性与总磷（tp）含量呈极显著正相关（r=0.986，p<0.01）.湖泊沉积物过氧化氢酶、多酚氧化酶与过氧化物酶活性变化趋势相近，分布状况与湖泊污染程度、人类活动干扰程度等紧密相连.湖泊沉积物微生物以细菌为主，放线菌次之，真菌最少.各湖泊氨化细菌数量差异较小，而反硝化细菌数量差异较大，反硝化细菌可能是导致该区域湖泊沉积物氮素累积的重要生物指示因子，可以作为反映湖泊富营养化程度的生物指示因子.图6表1参35
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