ConcentrationandDistributionofInorganicNutrientSaltsofNitrogenandPhosphorusinSurfaceWaterofChineseGreatWallBayandItsAdjacentSeaArea,Antarctica,duringAustralSummerof1993/1994
摘要
The concentrations and distributions of four species of inorganic nutrient salts in surfacesea water of Chinese Great Wall Bay and its adjacent sea area, Antarctica were surveyed during austrasummers of 1993~1994 The results obtained are as follows; The general concentrations of NH<sup>4sup>-N, NO<sup>3sup>-N, NO<sup>2sup>-N and PO<sup>4sup>-P are 2.13, 7.07, 0.74 and 1.12μg. dm<sub>-3sub>,respectively.Generally speaking, the concentrations are higher inside the Bay than those out-side and the higher values of those inorganic salts often appear in December. The time for the stationwhere their higher and lower concentrations appear are not completely the same. The descending orderof the magnitudes of EN/P value according to the arrangement monthly is:Dec. Feb.Jan.The varia-tions of water temperature are mostly consist with the concentrations of NH<sup>4sup>-N, PO<sup>4sup>-P and EN/P, butnot often with NO<sup>2sup>-N. The low concentrations of nutrient salts as shown in some satations may be relat-ed with absorption by phytoplankton,perhaps including autotrophic bacteria. The results suggest that the area surveyed has a typical characteristic of an inner shallow waterbay, sub-Antarctica.The nutrients needed for phytoplankton are sufficien, and the Bay surveyed isstill in a normal condition.