| 摘要: |
| 1855年以来黄河河口已经历了10余次大型改道,1950年以后改道3次。由于黄河口多次改道,尾闾往复摆动,黄河泥沙在河口大面积淤积(占总来沙量的20%),形成了现代黄河三角洲。黄河口的演变对河口海区的理化和生物环境均产生了一定影响。本文主要根据1959年农业部黄海水产研究所等单位1)和1984年中国科学院海洋研究所的调查资料(沈志良等,1989;李全生等,1986;任广法,1987),对黄河口1964年和1976年两次改道给河口海区水化学环境及生物生产力造成的影响作初步讨论。 |
| 关键词: 黄河囗演变、河口水化学环境 |
| DOI： |
| 分类号: |
| 基金项目:中国科学院海洋研究所调查研究报告第2141号 |
|
| EFFECTS OF THE YELLOW RIVER ESTUARY LOCATION CHANGES ON ITS HYDROCHEMICAL ENVIRONMENT |
|
Shen Zhiliang, Le Kentang
|
|
Institute of Oceanology, Academia Sinica
|
| Abstract: |
| Based on the surface distributions of the hydrochemical elements(S, O2, PO4 -P, SiO3-Si，NO3 -N, NO2 -N, NH4-N) in the flood and dry seasons in 1959 and 1984. this research on the effects of location changes of the Yellow River estuary in 1964 and 1976 on its hydrochemical environment and biological productivity showed that after the changes, the water tongues of the low salinity and high concentration nutrients moved from their positions near the original Yellow River estuary to the vicinity of the present Yellow River estuary; that the main influential area of the Yellow River brackish water moved to Laizhou Bay; and that the concentrations of all the elements changed. Before the change of river mouth position, NO3-N and NO2-N were exhausted by phytoplankton in many waters, the average of the atomic ratio between total inorganic N and PO4-P was only 4.5, and NO3-N was the main limiting factor for phytoplankton growth in the estuary area. After the change NO3-N concentration increased by 3.7 tinies,the atomic ratio between total inorganic N and PO4-P had reached 36 in the water affected by the Yellow River water. The large increase of inorganic N in the relocated (present) estuary is the main reason for the increase of phytoplankton in that area, Where the Yellow River freshwater and nutrients are now used to full advantage to enhance the biologcal productivity there. |
| Key words: hydrochemical elements,Yellow River estuary |
