摘要
1996～1997年对长江口水城进行调查,结果表明,其水体中氮、磷的含量为:硝酸盐,未检出～1.61 mg/L;亚硝酸盐,未检出～0.035 mg/L;氨氮,未检出～0.267 mg/L;磷酸盐。未检出～0.081 mg/L。氮、磷的平面分布由河口内向外呈逐渐降低趋势。该水域氮、磷含量历年来有升高趋势,1997年硝酸盐最高含量比1963年最高值高7.2倍;磷酸盐也有升高趋势,1997年最高值比1959年高2.9倍。长江口水域中氮、磷含量已超过海水评价标准,并导致了长江口水体的富营养化,这是引发该水域赤潮的重要因素之一。
Through the investigations in recent years,the concentrations of N and P in the Changjiang estuary were obtained.The concentration range of NO_3^--N was from below the limit of detection to 1.61 mg/L.The concentration range of NO_2^--N was from below the limit of detection to 0.035 mg/L.The concentration range of ammonia-N was from below the limit of detection to 0.267 mg/L.The concentration range of PO_4~)(3-)-P was from below the limit of detection to 0.081 mg/L.The distributions of N and P showed declination from in- ner estuary to the out waters.The concentritions of N and P in the Changjiang estuary was increasing gradually year by year.The maximal concentration of NO_3^--N in 1997 is about 8 times more than that in 1963,and PO_4^(3-)-P also increasing gradually.The maximal concentration of PO_4^(3-)--P in 1997 is about 2 times more than that in 1959.The bio-nutrients in the estuary have exceeded the standards of quality estimation for seawater (inorganic N 0.10 mg/L,inorganic P 0.015 mg/L),thus results in eutrophication in the Changjiang estuary, which is an important factor that leads to the happenning of red tide.
出处
《中国水产科学》
CAS
CSCD
1999年第5期6-9,共4页
Journal of Fishery Sciences of China
基金
农业部重点科研项目(渔95-B-96-10-01-0)
