近海养殖水体中NO_3^--N、NH_4^+-N和环境因子的关系

The Relationship between NO_3^--N,NH_4^+-N and Environmental Factors in Coastal Aquaculture Water

对福建近海养殖水体的NO-3-N、NH+4-N及氧化还原电位、化学需氧量COD、叶绿素a、浊度等进行测定,分析NO-3-N、NH+4-N与环境因子的相关关系,并计算不同环境因子和水体中NH+4-N相对含量的灰色关联度值.结果表明:氧化还原电位及COD值均与NH+4-N的浓度呈负相关,与NO-3的浓度呈正相关;叶绿素a浓度及浊度均和NH+4-N的浓度呈正相关,与NO-3-N的浓度呈负相关.各环境因子与NH+4-N的相对含量的灰色关联度值无明显差异.COD和氧化还原电位在丰水期的灰色关联度值比枯水期高,叶绿素a和浊度在丰水期的灰色关联度值则比枯水期低.

NO3^--N, NH/-N, oxidation-reduction potential, COD, chlorophyll-a and turbidity of Fujian coastal aquaculture water were analyzed to explore the relationship between NOT-N,NH4^＋-N and environmental factors.The results indicate that oxidation-reduction potential and COD are on a negative correlation with NH4^＋-N, but on a positive correlation with NO3^--N.The linearity between chlorophylla and turbidity is on the opposite side.The gray relevancy of these environmental factors is unanimous. For COD and oxidation-reduction potential, the gray relevancy is higher in the wet season than in the dry season.And for chlorophyll-a and turbidity,the gray relevancy is lower in the wet season than the dry season.