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南海东北部浮游植物对氮、磷加富的响应及与不同水团的关系

DOI: 10.3969/j.issn.0253-4193.2015.10.009

Keywords: 南海东北部 浮游植物 营养盐加富 水团

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Abstract:

2014年5月搭载"实验3"号科考船对南海东北部海区进行氮、磷营养盐现场加富培养实验。水团分析的结果表明,南海东北部海区的环境参数随着空间的变化大体可以分成3个区域:近岸海区、陆架海区和陆坡、海盆海区。加富培养过程中近岸海区和陆坡、海盆海区浮游植物未发生显著变化。陆架海区浮游植物出现显著增长,该海区浮游植物加富氮、磷以后在48 h出现反应,同时添加氮、磷显著促进了浮游植物的生长。各培养站位均检测到大量束毛藻,加富培养后迅速减少。营养盐的添加改变了海区浮游植物原有的硅甲藻比例与各粒级叶绿素比例,陆架海区培养后的改变最为明显,同时添加氮磷培养72 h后,由甲藻为主的优势种如卡氏前沟藻(Amphidinium carterae)、光亮鳍藻(Dinophysis argus)、原甲藻(Prorocentrum sp.)转变成了以硅藻为主如绕孢角毛藻(Chaetoceros cinctus)、旋链角毛藻(Chaetoceros curvisetus)、放射角毛藻(Chaetoceros radicans)和丹麦细柱藻(Leptocylindrus danicus)。同时,加富实验表明磷酸盐的添加促进了陆架海区微微型浮游植物聚球藻的生长

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