中国南极长城湾及附近海区1993/1994年夏季表层水样无机氮、磷酸盐的浓度及其分布状况

CONCENTRATIONS AND DISTRIBUTIONS OF INORGANIC NUTRIENT SALTS AND PHOSPHORS IN THE SURFACE SEA WATER OF CHINESE GREAT WALL BAY AND ITS ADJACENT SEA AREA OF ANTARCTICA DURING AUSTRAL SUMMERS OF 1993-1994

1993／1994年南极夏季对中国南极长城湾及附近海区表层海水四种营养盐浓度及其分布状况作了调查。结果表明，NH4－N、NO3－N、NO2－N及PO4－P的大致浓度分别是2．13、7．07、0．74和1．12μg·dm-3。一般来说，湾内高于湾外氮盐于12月份常出现高值。四种形态的无机盐类之最高、最低浓度出现的时间和站位不尽一致。∑N／P递减次序大致是12月，2月，1月。水温变化与NH4－N、PO4－P浓度和∑N／P的变化常较一致，而与NO2－N则常不一，一些站位上营养盐浓度偏低可能与浮游植物摄取有关。结果显示了调研海区的浅水内湾特征。浮游植物所需营养充分。该湾仍维持正常状态。

The concentrations and distributions of four species of inorganic nutrient salts in the surface water of the Chinese Great Wall Bay and its adjacent sea area of Antarctica were surveyed during the austral summers of 1993-1994. The results obtained are as follows. The general concentrations of NH4-N, NO3-N, NO2-N and PO4-P are 2.13, 7.07, 0.74 and 1. 12μg·dm-3, respectively. Generally speaking, the concentrations are higher inside the Bay than those outside, and the higher values of those inorganic nitrogenous salts of ten appear in December. The time when or the place wherc their highest and lowest concentrations appear are not completely the same. The descending order of the magnitudes of ∑N/P as arranged in their corresponding months is December, February and January. The variations of water temperature are mostly consistent with the concentrations of NH4-N, PO4-P or ∑N/P, but not of ten with NO2-N. The low concentrations of nutrient salts as shown at some stations may be related with the absorption by phytoplankton, perhaps including autotrophic bacteria. The results suggest that the area surveyed has a typical characteristic of an inner shallow water bay in sub-Antarctica. The nutri ents needed for phytoplankton are sufficient, and the Bay suryeyed is still in a normal condition.