Concentrations of particulate phosphorus in different size fractions and dissolved organic and inorganic phosphorus in surface seawater of the Southeast Atlantic

Variations in concentration of total phosphorus in surface waters of dif¬ferent trophicity are discussed. Forms distinguished were: total particulate phosphorus in particles of size >150 ?m, and <20 ?m; dissolved organic phosphorus and dissolved phosphate. Even in hypertrophic waters, the dominant form is still dissolved phosphate (>65%). Concentrations of particulate phosphorus in different size fractions are additional indicators of the level of productivity of waters.本研究探讨了不同营养状态（trophicity）地表水中总磷（total phosphorus）浓度的变化规律。研究中划分的磷形态包括：粒径大于150μm的总颗粒态磷（total particulate phosphorus）、粒径小于20μm的总颗粒态磷，以及溶解有机磷（dissolved organic phosphorus）与溶解态正磷酸盐（dissolved phosphate）。即便在超富营养水体（hypertrophic waters）中，溶解态正磷酸盐仍为优势形态，占比超过65%。不同粒径分级的颗粒态磷浓度，可作为水体生产力水平的辅助评价指标。