南极普里兹湾营养盐消耗及新生产力的估算

研究了ＣＨＩＮＡＲＥ－６和ＣＨＩＮＡＲＥ－９普里兹湾内营养盐的分布及变化，采用化学质量平衡方法估计了该海区新生产力的大小。结果表明在ＣＨＩＮＡＲＥ－６期间，ＮＯ３－Ｎ、ＰＯ４－Ｐ、ＳｉＯ３－Ｓｉ消耗分别为１０６４．８、６９．２、２１９６．９ｍｍｏｌ／ｍ２，ＮＰ、ＳｉＰ吸收比分别为１５．３、３１．７，平均新生产力为９９２．４ｍｇＣ／（ｍ２ｄ）。在ＣＨＩＮＡＲＥ－９期间，ＮＯ３－Ｎ、ＰＯ４－Ｐ消耗分别为５５１．９、４１．２ｍｍｏｌ／ｍ２，ＮＰ吸收比为１３．４，平均新生产力３９０．１ｍｇＣ／（ｍ２ｄ），表现出很大的季节和／或年际变化。估算的新生产力值都大于１４Ｃ测定的初级生产力值，表明普里兹湾海区夏季有很大的新生产力。元素吸收比和外海测定值不同，表明营养盐的吸收和循环在南极海区有很大的区域差异性。

THE DEPLETION OF NUTRIENTS AND THE ESTIMATE OF THE NEW PRODUCTION IN THE ICE EDGE IN PRYDZ BAY,ANTARCTICA

The distributions and changes of nutrients in Prydz Bay were investigated during CHINARE 6 and CHINARE 9, and the new productions were estimated by using mass balance method. The results showed that in CHINARE 6, the consumptions of NO 3 N、PO 4 P、SiO 3 Si were 1064.8、69.2、2196.9mmol/m 2,the uptake ratio of N and Si to P were 15 3, 31.7,respectively, and new production was 992.4 mgC/(m 2·d) ; and that in CHINARE 9, the depletions of NO 3 N、PO 4 P was 551.9、41.2mmol/m 2,respectively,the uptake ratio of N to P was 13.4,and the new production was 390.1 mgC/(m 2·d),indicating significant annual and /or seasonal variation. New productions were both greater than the primary production determined by 14 C trace method,demonstrating there existed rather higher new production in Prydz Bay in austral summer. The uptake ratio of nutrients in Prydz Bay, however, is different from the previous values obtained from the open sea,showing the regional difference of uptake and regeneration of nutrients in Southern Ocean. Finally the annual change of new production and the characteristics of phytoplankton production were discussed.