1999/2000年夏季南极普里兹湾及湾口区叶绿素a和初级生产力

PRIMARY PRODUCTIVITY AND STANDING STOCK OF PHYTOPLANKTON IN THE PRYDZ BAY AND THE ADJACENT NORTHERN SEA AREA DURING THE AUSTRAL SUMMER OF 1999/2000

20 0 0年 1月 1 9日至 2 7日在 70°3 0′E- 75°3 0′E,6 2°S以南的南极普里兹湾近岸陆架区的陆隆向深海区设三条纵断面进行浮游生物现存量、真光层深度和光合作用速率的现场观测。并在冰间湖站 - 1 2进行连续昼夜观测。结果表明 ,观测海区叶绿素 a浓度高值位于近岸海湾、冰间湖和测区中部的陆坡区 ;陆坡中部站 - 6和 - 8,0 - 5 0 m的浅水层为叶绿素 a高值区 (2 .1 6- 5 .0 8μg/dm3 )。各测站平均叶绿素 a浓度 2 5 m次表层 (1 .49± 1 .6 1 μg/dm3 )高于表层 (1 .1 4±1 .1 9μg/dm3 ) ,5 0 m以下更深层的浓度随深度的增加而降低 ,2 0 0 m层叶绿素 a浓度仅 0 .0 3±0 .0 2μg/dm3 。昼夜观测结果表明表层叶绿素 a浓度在南极夏季的午后出现最大值 ,晨间出现最小值 ;2 5 m以浅水层的叶绿素 a浓度明显高于深层水 ,与封冰消融冰藻的释放有关。测区真光层潜在初级生产力为 0 .76 - 1 2 .5 9mg C/(m3· h) ,平均值为 4.0 1± 4.0 7mg C/(m3· h) ;海湾和陆架区现场生产力均超过 1 .5 g C/(m2 · d) ,陆坡、深海区约 0 .5 g C/(m2 · d)。高生产力位于高生物量的近岸海湾、陆架冰间湖区。光合作用同化数在 0 .88- 3 .1 0 mg C/(mg Chla· h)。表层叶绿素a浓度与海水中溶解氧浓度呈紧密相关 (Y=0 .0 5

In the 19th to 27th, January, 2000, the primary productivity, standing stock of phytoplankton, euphotic layer were surveyed in the Plydz Bay and the adjacent northern sea area, (62°N-68°N, 70°30′E-75°30′E), Antarctica. The result showed that the high chlorophyll a concentration was in the coastal bay, the polynya and the slope of the middle surveyed area. The higher area of chlorophyll a concentration (2.16-5.08μg/dm 3) were in the supper layer (0-50m) of the stations Ⅲ 6, Ⅲ 8. The average concentration in the subsurface (1.49±1.61μg/dm 3) is higher than that in the surface water(1.14±1.19μg/dm 3), then the concentration descended with water depth increased, the average chlorophyll a concentration is 0.03±0.02μg/dm 3 in the layer 200m. In the anchor station (Ⅲ 12), the maximum chlorophyll a concentration was in the afternoon of the austral summer, the concentrations in the surface water (0-25m) were higher than that deep layer which concerning continental border ice dissolved and ice algal released in the sea water. The potential primary productivity were 0.76-12.59μgC/(m 3·h), the average value was 4.01±4.07 mgC/(m 3·h) in the surveyed area;The in situ productivity more than 1.5gC/(m 2·d) was in the bay and continental area, and about 0.5gC/(m 2·d) appeared in the slope and deep sea area .The higher productivity was located on the coastal bay and the polynya of the continental shelf. The administration number was 0.88-3.10mgC/(mg Chla·h). The surface chlorophyll a concentration was related to the dissolved oxygen intently ( Y =0.059 X -41.02, r 2=0.931), and discussed the surface chlorophyll a concentration was interrelated ΔpCO 2 in the surface sea water.