春夏季长江口及其邻近海域表层和底层环境因素、氮分布分析
发布时间:2018-01-21 11:12
本文关键词: 长江口 无机氮 温度 盐度 分布趋势 结构分析 出处:《生态环境学报》2016年02期 论文类型:期刊论文
【摘要】:以2007─2013年连续7年长江口及邻近海域(包括长江口、杭州湾和舟山渔场)春、夏两季的调查资料为依据,研究了长江口及其邻近海域表层和底层温度和盐度的空间分布特征、无机氮(DIN)含量的分布趋势及DIN含量的结构特征。研究结果表明:长江口、杭州湾和舟山渔场3个区域春、夏两季表层和底层温度分布均呈现西高东低。表层东西向相差3℃左右,底层东西向相差2.2℃左右,表层和底层温度无显著性差异。3个区域盐度分布不同,长江口盐度分布呈现西低东高,梯度明显,杭州湾盐度变化不明显,舟山渔场东部和南部盐度较高;3个区域表层和底层盐度无明显差别。长江口表层和底层DIN含量有差别,表层含量大于底层;在杭州湾和舟山渔场表层和底层DIN含量变化不明显。长江口、杭州湾和舟山渔场表层和底层的DIN结构均以NO_3~--N(硝酸盐)为主,其次是NH_4~+-N(氨氮),含量最低的为NO_2~--N(亚硝酸盐)。表层和底层的温度和盐度无显著性差异,可能是表层和底层DIN含量结构一致的主要因素。2007─2013年春、夏季表层和底层DIN结构比例变化一致,DIN的结构分布受水深的影响不大。表层和底层的NO_3~--N所占DIN百分比基本在60%以上,NH_4~+-N所占DIN百分比在3%~41%,NO_2~--N所占DIN的百分比均低于5%。因此,DIN含量的变化主要受NO_3~--N和NH_4~+-N的变化影响。
[Abstract]:Based on the survey data from the Yangtze Estuary and its adjacent waters (including the Yangtze Estuary, Hangzhou Bay and Zhoushan fishing grounds) for seven consecutive years on 2013, 2007, spring and summer. The spatial distribution characteristics of surface and bottom temperature and salinity, the distribution trend of inorganic nitrogen (tin) content and the structural characteristics of DIN content in the Changjiang Estuary and its adjacent waters were studied. The temperature distributions of surface and bottom layers in spring and summer in Hangzhou Bay and Zhoushan fishing ground were all high in west, high in east and low in bottom, the difference of surface east to west was about 3 鈩,
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