海洋学报（中文版）
海洋學報（中文版）
해양학보（중문판）
ACTA OCEANOLOGICA SINICA
2013年
6期
170-177
,共8页
王磊%钟超%柳欣%黄邦钦
王磊%鐘超%柳訢%黃邦欽
왕뢰%종초%류흔%황방흠
浮游植物%昼夜变化%群落结构%南海东北部%东海
浮遊植物%晝夜變化%群落結構%南海東北部%東海
부유식물%주야변화%군락결구%남해동북부%동해
phytoplankton%diurnal variation%community structure%the northeastern South China Sea%the East China Sea
于2008年和2009年夏季分别对南海东北部和东海陆架区浮游植物生物量和群落结构的昼夜变化进行了24 h时间序列连续观测和研究。通过高效液相色谱法分析浮游植物特征光合色素可以看出3个测站的叶绿素a浓度均呈现出明显的昼夜变化，最高值出现在夜间，而在中午至午后达到最低值，而这种昼夜变化主要是由于光照和潮汐作用所导致。各站均以硅藻为最主要的优势类群，受上升流影响的S702站硅藻生物量超过80％，S305和D H04站硅藻也占据了35％～50％，且3个测站硅藻生物量昼夜变化与叶绿素a一致，但所占生物量百分比却在叶绿素 a高值的时间段较低，表明高生物量对应着更为丰富的浮游植物类群组成多样性。除硅藻外，S305站青绿藻也表现出与叶绿素a同步的昼夜变化规律。而在东海DH04站，由于存在明显层化特征，聚球藻是上混合层的主要优势类群，且表现出与叶绿素a一致的变化。黎明前后，甲藻出现了暴发式的生物量升高，所占生物量超过30％，由于其昼夜变化并不明显，分析可能由于水团的侧向输送所致。
于2008年和2009年夏季分彆對南海東北部和東海陸架區浮遊植物生物量和群落結構的晝夜變化進行瞭24 h時間序列連續觀測和研究。通過高效液相色譜法分析浮遊植物特徵光閤色素可以看齣3箇測站的葉綠素a濃度均呈現齣明顯的晝夜變化，最高值齣現在夜間，而在中午至午後達到最低值，而這種晝夜變化主要是由于光照和潮汐作用所導緻。各站均以硅藻為最主要的優勢類群，受上升流影響的S702站硅藻生物量超過80％，S305和D H04站硅藻也佔據瞭35％～50％，且3箇測站硅藻生物量晝夜變化與葉綠素a一緻，但所佔生物量百分比卻在葉綠素 a高值的時間段較低，錶明高生物量對應著更為豐富的浮遊植物類群組成多樣性。除硅藻外，S305站青綠藻也錶現齣與葉綠素a同步的晝夜變化規律。而在東海DH04站，由于存在明顯層化特徵，聚毬藻是上混閤層的主要優勢類群，且錶現齣與葉綠素a一緻的變化。黎明前後，甲藻齣現瞭暴髮式的生物量升高，所佔生物量超過30％，由于其晝夜變化併不明顯，分析可能由于水糰的側嚮輸送所緻。
우2008년화2009년하계분별대남해동북부화동해륙가구부유식물생물량화군락결구적주야변화진행료24 h시간서렬련속관측화연구。통과고효액상색보법분석부유식물특정광합색소가이간출3개측참적협록소a농도균정현출명현적주야변화，최고치출현재야간，이재중오지오후체도최저치，이저충주야변화주요시유우광조화조석작용소도치。각참균이규조위최주요적우세류군，수상승류영향적S702참규조생물량초과80％，S305화D H04참규조야점거료35％～50％，차3개측참규조생물량주야변화여협록소a일치，단소점생물량백분비각재협록소 a고치적시간단교저，표명고생물량대응착경위봉부적부유식물류군조성다양성。제규조외，S305참청록조야표현출여협록소a동보적주야변화규률。이재동해DH04참，유우존재명현층화특정，취구조시상혼합층적주요우세류군，차표현출여협록소a일치적변화。려명전후，갑조출현료폭발식적생물량승고，소점생물량초과30％，유우기주야변화병불명현，분석가능유우수단적측향수송소치。
Three time-series stations were assigned to the survey of the diurnal variations of phytoplankton biomass and community by the means of photosynthetic pigments at two stations in the northeastern South China Sea ,sum-mer 2008 and one station in the East China Sea in summer 2009 ,respectively .Remarkable diurnal variations of Chl a biomass (fluctuation between 34% ~81% ) ,with the maximum in the nighttime and minimum under daylight was the generality at the three stations under the effects of the tidal mixing and light .Diatoms were more preponderant at Sta .S702 (> 80% ) than Sta .S305 and DH04 (35% ~50% ) ,at which the former was influenced by the coast-al upwelling .The biomass of diatoms varied with total Chl a biomass synchronously ,but the percentage of diatoms changed inversely .It implied the diversity of phytoplankton composition were also improved during the nighttime under the effect of tidal mixing .Prasinophytes was the second dominate group at Sta .S305 ,and also exhibited the same diurnal variation as total Chl a biomass .And the similar response of Synechococcus at Sta .DH04 ,the stratifi-cation status at the East China Sea ,dominated at the upper mixed layer ,also had the diurnal variation pattern with the total Chl a .But the dinoflagellates had a outburst at 03:30 as no indication of any diurnal variation .So the dis-tribution might be the results of lateral transport of other water mass .
