摘要
2003年7～9月中国第2次北极科学考察在北太平洋和白令海的BR断面和白令海峡南口门的BS断面的初夏和夏末两航段进行叶绿素-a浓度和初级生产力的现场观测.结果表明,BR断面表层叶绿素-a浓度为0.199～1.170μg/dm^3,平均值为（0.723±0.283）μg/dm63;水深10～30m次表层的叶绿素-a浓度明显高于真光层下的深层水.水柱平均叶绿素-a浓度呈现明显的区域性特征,白令陆架区＞白令陆坡区＞阿留申海盆区＞北太平洋西部海域.BS断面叶绿素-a浓度高于BR断面,夏末的平均浓度（（5.311±5.656）μg/dm^3）是初夏浓度（（1.605±1.194）μg/dm^3）的3.3倍,是BR断面平均浓度的7.5倍.观测站真光层内初级生产力在0.471～19.046mgC/（m^3·h）,陆架海域的初级生产力明显高于陆坡和海盆区,BS断面的平均初级生产力比BR断面高约12倍.观测站光合作用同化数在0.45～2.80mgC/（mgChla·h）.
Investigations of standing stock of phytoplankton （chlorophyll a） and primary productivity were carried out in the Bering Sea along a longitudinal （the BR line, 51°38＇ - 60°40＇N, 168°06＇E - 178°15＇W） and a latitudinal （the BS line, 64°20＇N, 171°30＇W- 167°00＇W） transects during the 2^nd Chinese National Arctic Research Expedition in the summer of 2003. The stations of the BR line were surveyed on 24 - 27 July （early summer） and the survey of the BS line took place on 28 - 29 July （early summer） and on 12 - 13 September （latter summer）, respectively. The results showed that the surface chlorophyll a concentrations were 0. 199 - 1. 170 μg/dm^3, and the average value was （0.723 - 0.283） μg/dm^3 on the BR line. For the BS line, surface chlorophyll a concentrations were 0.519-4.644 μg/dm^3 （average （1.605 ± 1. 194）μg/dm^3） and 0.568 - 14.968 μg/dm^3（average （5.311 ± 5.656） μg/dm^3） during the early and latter summer, respectively. The average value in the latter summer was much higher than that in the early summer. The high values （more than 4.0 μg/dm^3） occurred at stations of the BS line in the southern Bering Channel. Chlorophyll a concentrations in the sub-surface layer were higher than in the surface layer. The potential primary productivities varied between 0.471 and 1. 147 mgC/（m^3 · h） on the BR line, with average rates of （0.728± 0. 315） mgC/（ m^3· h）. The potential primary productivities on the BS line were much higher than that of the BR line, ranging from 1.227 mgC/（ m^3· h） at early summer to 19.046 mgC/（ m^3 · h） at latter summer. The assimilation number of photosynthesis was 0.45 - 2.80 mgC/（mgChla· h）.
出处
《生态学报》
CAS
CSCD
北大核心
2006年第5期1345-1351,共7页
Acta Ecologica Sinica
基金
国家自然科学基金资助项目(40476004
40476003)
中国第2次北极科学考察资助项目~~
