摘要
根据１９９６ 年对舟山渔场近岸海域的三期调查结果，讨论了海水中营养盐的含量及分布特征。结果表明，调查海区海水中营养盐含量较高，超标严重；营养物质的浓度一般在长江和钱塘江河口最高，由岸向外渐低，且表层高于底层，呈现与盐度负相关的规律性；由于受化学和生物过程的影响，活性磷酸盐在空间分布上表现出明显的特殊性，８ 月和１１ 月磷酸盐含量在长江口没有形成峰值区，５ 月和８ 月大部分外侧站位磷酸盐含量底层明显高于表层；不同营养盐表现出了不同的年内变化特点，硝酸盐氮含量５ 月＞ ８ 月＞ １１ 月，磷酸盐含量１１ 月＞ ８ 月＞ ５ 月，硅酸盐含量８ 月＞ １１ 月＞ ５ 月；营养物质的含量一般在高潮位较低。
According to the three environmental surveying results in 1996, the concentrations and distribution characteristics of the nutrient in seawater are discussed in this paper. The results show that the nutrient concentrations in this area were rather high, and most of them exceed the seawater standard remarkably. The nutrient concentrations at Changjiang Estuary and Qiantang River Estuary were the highest, and farther and lower off the shore. It was higher in the surface than the bottom and displays the negative correlation with salinity. Because of offect of chemical and biological processes, the spatial distribution of DIP a outstanding peculiarity, the concentration peak in August and November in Changjiang Estuary did not occur. The bottom concentration of DIP of the most outside stations were obviously higher than that of surface in May and August. Different kinds of nutrient displays the different temporal variation annually. Concentration of NO - 3-N is as follows: May>August>November, DIP: November>August>May, SiO 2- 3 Si: August>November>May. Concentrations of nutrient are generally rather lower at high tide, and higher at low tide.
出处
《海洋环境科学》
CAS
CSCD
北大核心
1999年第2期43-48,共6页
Marine Environmental Science
关键词
营养盐
含量
变化
舟山渔场
海洋监测
nutrient, concentration, distribution and variation
