【摘要】 本研究根据2020年夏季SOPHI航次21个站位水体中6项营养盐(NH₄⁺-N、NO₂^--N、NO₃^--N、溶解无机氮（DIN）、PO₄^3--P、SiO₃^2--Si)的调查数据，解析了调查区域营养盐的分布特征，并结合悬浮物（TSM）等环境参数，探究其主要影响因素.结果表明，NH₄⁺-N、NO₂^--N、NO3--N、溶解无机氮（DIN）、PO₄^3--P、SiO₃^2--Si及悬浮物（TSM）的平均浓度（mg·L-1）分别为0.0246、0.00764、0.135、0.167、0.0256、0.576及16.8.其中低于第四类海水水质标准的样品数量较低（<10%），表明该区域整体水质良好. NO₃^--N、DIN及SiO₃^2--Si的平面分布具有保守性，其中NO₃^--N与SiO₃^2--Si的平面分布由近岸到远洋呈逐渐降低趋势.其原因是地处近岸区域受长江径流输入的影响所致.而PO₄^3--P和NO₂^--N的平面分布则显示为非保守性，其主要受所在区域海洋上升流及黑潮次表层水涌升影响.尽管NH₄⁺-N的分布呈现一定的保守性，且其平面分布趋势与NO₃^--N与SiO32--Si接近，但其高值点分析结果显示，除长江径流输入影响之外，人类活动亦对NH₄⁺-N的分布具有明显影响.更多还原

【Abstract】 Based on survey data of six nutrients including NH₄⁺-N, NO₂^--N, NO₃^--N, dissolved inorganic nitrogen（DIN）, PO43--P and SiO32--Si, and the related environmental parameters including total suspended matter（TSM） conducted in Summer, 2020, during the SPOHI Cruise, the distribution characteristics of nutrients were analyzed and the main influencing factors was discussed. The obtained results showed that the average concentrations（mg·L-1） of NH₄⁺-N, NO₂^--N, NO₃^--N, DIN,PO₄^3--P, SiO₃^2--Si and TSM were 0.0246, 0.00764, 0.135, 0.167, 0.0256, 0.576 and 16.8,respectively. Among them, the number of samples which were below the fourth-class seawater quality was low（less than 10.0%）. It indicated that the overall water quality in this investigated area was good. The planar distributions of NO₃^--N, DIN and SiO₃^2--Si were conservative, and were gradually decreasing from the near shore area to the open ocean. The reason was that the investigated area was mainly affected by the input of the runoffs from the Yangtze River. However, the plane distributions of PO₄^3--P and NO₂^--N were non-conservative, which were mainly affected by the upwellings in the area and the upwellings of the Kuroshio subsurface seawater. Additionally, the plane distribution of NH4+-N was conservative to a certain extent, and was close to those of NO₃^--N and SiO₃^2--Si. However, based on the high value point measurement, it showed that the human activities also demonstrated an obvious effect on the its distribution, in addition to the impact of the Yangtze River runoff input.更多还原