CAJ | 학술논문

利用2008年夏季中国第三次北极科学考察获得的营养盐、叶绿素 a、温度和盐度等数据资料，结合现场营养盐添加实验的结果讨论西北冰洋加拿大海盆北部营养盐对浮游植物生长的限制作用。结果表明：由于融冰水稀释作用，加拿大海盆 B80站约20 m 深度存在较强的盐跃层，阻碍了水体上下混合。较低浓度的溶解无机氮（DIN）和硅酸盐（分别为0．31μmol／L 和0．94μmol／L）以及严重偏离Redfield 比值的 N／P、N／Si 比值（分别为0．42和0．32）表明加拿大海盆表层水体存在 N 和 Si 限制。根据现场营养盐加富实验各培养组叶绿素 a 浓度变化、营养盐吸收总量差异和浮游植物种群结构，进一步表明氮是北冰洋海盆首要限制营养盐，而 Si 则抑制了硅质生物的生长。同时，较小的硝酸盐半饱和常数（K s ）证明即使在营养盐充足的情况下北冰洋海盆浮游植物生长速率也处于较低水平。计算得到各培养组营养盐吸收比例（N／P 比值）均大于 Redfield 比值，可能是培养实验过程中以微型、微微型浮游植物为主，硅藻等小型浮游植物为辅造成的。
이용2008년하계중국제삼차북겁과학고찰획득적영양염、협록소 a、온도화염도등수거자료，결합현장영양염첨가실험적결과토론서북빙양가나대해분북부영양염대부유식물생장적한제작용。결과표명：유우융빙수희석작용，가나대해분 B80참약20 m 심도존재교강적염약층，조애료수체상하혼합。교저농도적용해무궤담（DIN）화규산염（분별위0．31μmol／L 화0．94μmol／L）이급엄중편리Redfield 비치적 N／P、N／Si 비치（분별위0．42화0．32）표명가나대해분표층수체존재 N 화 Si 한제。근거현장영양염가부실험각배양조협록소 a 농도변화、영양염흡수총량차이화부유식물충군결구，진일보표명담시북빙양해분수요한제영양염，이 Si 칙억제료규질생물적생장。동시，교소적초산염반포화상수（K s ）증명즉사재영양염충족적정황하북빙양해분부유식물생장속솔야처우교저수평。계산득도각배양조영양염흡수비례（N／P 비치）균대우 Redfield 비치，가능시배양실험과정중이미형、미미형부유식물위주，규조등소형부유식물위보조성적。
The concentrations of nitrate,phosphate,silicate,Chl a were analyzed and in situ nutrients enrichment ex-periment was conducted in the summer of 2008 to discuss the impact of macronutrient limitation on phytoplankton biomass and community structure in the western Arctic Canada Basin.The results showed that there was a strong stratification in the upper 20 m at B80 station.Lower concentrations of dissolved inorganic nitrogen (DIN)and sili-cate (0.31 and 0.94 μmol/L,respectively)and serious deviation from the Redfield ratio of the N/P,N/Si (0.42 and 0.32,respectively)indicated N and Si limited in the upper layer of the Canada Basin.According to the trend of Chl a,nutrients uptake and phytoplankton community structure during the experiment deduced that nitrogen was the primary limited nutrient,while silicate inhibited the growth of siliceous phytoplankton in the upper layer of the Canada Basin.Meanwhile,the smaller half saturation constant (K s )of nitrate can also prove that the phytoplank-ton growth rates were at a low level even the absence of nutrient limitation in the Arctic Basin.The phytoplankton species were dominated by nano-or pico-phytoplankton rather than diatom,which would be responsible for the higher nutrient assimilation ratios of N/P compared to the Redfield ratio.