CAJ | 학술논문

通过2012年夏季第五次北极科学考察期间在楚科奇海及其邻近海域现场调查所获得的数据分析研究了海域的粒度分级叶绿素 a 浓度和初级生产力。结果表明，叶绿素 a 浓度和初级生产力的高值均出现在楚科奇海陆架区，并且远高于深海区。去程时调查海域水层平均叶绿素 a 浓度的变化范围为0．32～15．66 mg/m3，平均（2．77±3．96）mg/m3，高值区出现在南部邻近白令海峡海域、北部阿拉斯加巴罗近岸和冰缘区；初级生产力的范围为50．11～943．28 mg/（m2d），高值出现在冰缘水华区。返程时水层平均叶绿素 a 浓度的变化范围为0．07～1．52 mg/m3，平均（0．41±0．40）mg/m3，高值仍出现在陆架区，但比去程时低了一个数量级；初级生产力的分布范围为12．31～41．35 mg/（m2d），高值出现在陆架区。浮游植物粒度分级测定结果表明，在生物量较低的深海区，叶绿素 a 浓度和初级生产力的粒级结构以微微型浮游生物（Pico 级份）占优势（其贡献率分别为46．1％和56．9％），小型（Net级份）和微型（Nano 级份）对总叶绿素 a 浓度的贡献差异极小，分别为26．6％和27．3％，对总初级生产力的贡献分别为23．8％和19．3％；而在生物量较高的水深小于200 m 的陆架区，Net 级份叶绿素 a 浓度所占百分比最高，Pico 级份次之，Nano 级份最低，分别为59．8％、27．9％和12．3％，初级生产力的粒级结构中叶绿素 a 浓度所占百分比由高到低同样是 Net、Pico 和 Nano，所占百分比分别为60．6％，32．2％和7．2％。
통과2012년하계제오차북겁과학고찰기간재초과기해급기린근해역현장조사소획득적수거분석연구료해역적립도분급협록소 a 농도화초급생산력。결과표명，협록소 a 농도화초급생산력적고치균출현재초과기해륙가구，병차원고우심해구。거정시조사해역수층평균협록소 a 농도적변화범위위0．32～15．66 mg/m3，평균（2．77±3．96）mg/m3，고치구출현재남부린근백령해협해역、북부아랍사가파라근안화빙연구；초급생산력적범위위50．11～943．28 mg/（m2d），고치출현재빙연수화구。반정시수층평균협록소 a 농도적변화범위위0．07～1．52 mg/m3，평균（0．41±0．40）mg/m3，고치잉출현재륙가구，단비거정시저료일개수량급；초급생산력적분포범위위12．31～41．35 mg/（m2d），고치출현재륙가구。부유식물립도분급측정결과표명，재생물량교저적심해구，협록소 a 농도화초급생산력적립급결구이미미형부유생물（Pico 급빈）점우세（기공헌솔분별위46．1％화56．9％），소형（Net급빈）화미형（Nano 급빈）대총협록소 a 농도적공헌차이겁소，분별위26．6％화27．3％，대총초급생산력적공헌분별위23．8％화19．3％；이재생물량교고적수심소우200 m 적륙가구，Net 급빈협록소 a 농도소점백분비최고，Pico 급빈차지，Nano 급빈최저，분별위59．8％、27．9％화12．3％，초급생산력적립급결구중협록소 a 농도소점백분비유고도저동양시 Net、Pico 화 Nano，소점백분비분별위60．6％，32．2％화7．2％。
Size fractionated standing stock and primary production of phytoplankton in the Chukchi Sea and the adja-cent sea area were studied during the 5th Chinese National Arctic Research Expedition in the summer of 2012.The results clearly showed that there was marked feature of spatial zonation in the sea areas investigated.In the shelf region,the standing stock and primary production were much higher than those of deep-sea area.The water col-umn integrated average values of Chl a concentration varied from 0.32 to 15.66 mg/m3 [on average (2.77±3.96) mg/m3 ]during the outward voyage.The high values appeared in the southern Chukchi Sea,coast areas near Point Barrow of Alaska and northern ice edge area.The lowest and highest value of primary production (PP)were 50.11 mg/(m2 ·d)and 943.28 mg/(m2 ·d),and the high value was encountered in the ice edge where phytoplankton bloom happened.During the return voyage,the water column integrated average value of Chl a concentration was an order of magnitude lower than the outward voyage.The values of PP were 12.31~41.35 mg/(m2 ·d),with the high value appearing in the shelf region.The results of size-fractionated Chl a and PP showed that photosyn-thetic picoplankton was the greatest contributor to phytoplankton stocks and production in deep-sea area (46.1%and 56.9% respectively),and the differences between contributions of microplankton and nanoplankton to Chl a and PP were very small.But in the shelf region,microplankton took the dominant position of Chl a(59.8%)and PP (60.6%),picoplankton second and nanoplankton the minimum.