CAJ | 학술논문

为探讨夏季南沙海域氮（ N）、磷（ P）加富对浮游植物群落结构的影响，2013年夏季在南沙海域西南大陆架S1站（9°30′N，109°30′E）和曾母暗沙附近S2站（4°30′N，109°30′E）进行了多组添加N、P营养盐的现场加富实验。通过实验和数据分析对2个站位的浮游植物种类组成、丰度、多样性指数变化和群落更替情况进行了研究。结果表明：1）营养加富后浮游植物种类数增加；2）各加富组随着添加浓度增高，Shannon-Wiener多样性指数下降；3）从添加单一营养盐到复合营养盐组，浮游植物群落的优势类群出现了从甲藻到硅藻的演替；4）营养盐加富在短期内会使浮游植物丰度快速增加，但超过一定水平后，其促进作用减弱甚至抑制甲藻的生长；5）随着各组营养盐添加浓度的增高，加N、加P组的种群总丰度和甲藻门、硅藻门丰度变化不大，加N+P组的总丰度和硅藻门丰度显著上升，甲藻门丰度显著下降，说明N和P共同限制了浮游植物生长。
위탐토하계남사해역담（ N）、린（ P）가부대부유식물군락결구적영향，2013년하계재남사해역서남대륙가S1참（9°30′N，109°30′E）화증모암사부근S2참（4°30′N，109°30′E）진행료다조첨가N、P영양염적현장가부실험。통과실험화수거분석대2개참위적부유식물충류조성、봉도、다양성지수변화화군락경체정황진행료연구。결과표명：1）영양가부후부유식물충류수증가；2）각가부조수착첨가농도증고，Shannon-Wiener다양성지수하강；3）종첨가단일영양염도복합영양염조，부유식물군락적우세류군출현료종갑조도규조적연체；4）영양염가부재단기내회사부유식물봉도쾌속증가，단초과일정수평후，기촉진작용감약심지억제갑조적생장；5）수착각조영양염첨가농도적증고，가N、가P조적충군총봉도화갑조문、규조문봉도변화불대，가N+P조적총봉도화규조문봉도현저상승，갑조문봉도현저하강，설명N화P공동한제료부유식물생장。
To investigate the potential influence of nitrogen and phosphate on phytoplankton community structure,we conducted field experi-ments and enrichment incubation experiments in Nansha area[the southwest continental shelf and near the James shoal area:S1(9°30′N, 109°30′E)and S2(4°30′N,109°30′E)]in summer of 2013. The results show that:1)The number of phytoplankton species increased after enrichment;2)Shannon-Wiener diversity index declined with increasing nutrient concentration;3)Pyrrophyta and Bacillariophyta were the dominant species before and after the enrichment incubation,respectively. Pyrrophyta had more competitive advantages than Bacillariophyta in the oligotrophic region,leading to the shift from Pyrrophyta to Bacillariophyta;4)Nutrient enrichment caused rapid growth of phytoplank-ton in a short time,but it inhibited phytoplankton growth when exceeding a certain level and the inhibition was associated with the phyto-plankton species;5)With increasing nutrients concentration in each group,the abundance of Pyrrophyta and Bacillariophyta in single N and singlePgroupshadlittlechange,buttheabundanceofPyrrophytainmixedNandPgroupsdecreasedsignificantly,andtheabundanceof Bacillariophyta increased significantly. Mixed N and P limited the phytoplankton growth.