海洋学报(中文版)
海洋學報(中文版)
해양학보(중문판)
Acta Oceanologica Sinica
2015年
10期
88-99
,共12页
李佳俊%沈萍萍%谭烨辉%姜歆%周林滨
李佳俊%瀋萍萍%譚燁輝%薑歆%週林濱
리가준%침평평%담엽휘%강흠%주림빈
南海东北部%浮游植物%营养盐加富%水团
南海東北部%浮遊植物%營養鹽加富%水糰
남해동북부%부유식물%영양염가부%수단
northeastern South China Sea%phytoplankton%nutrient enrichment%water masses
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(Di-nophysis 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。
2014年5月搭載“實驗3”號科攷船對南海東北部海區進行氮、燐營養鹽現場加富培養實驗。水糰分析的結果錶明,南海東北部海區的環境參數隨著空間的變化大體可以分成3箇區域:近岸海區、陸架海區和陸坡、海盆海區。加富培養過程中近岸海區和陸坡、海盆海區浮遊植物未髮生顯著變化。陸架海區浮遊植物齣現顯著增長,該海區浮遊植物加富氮、燐以後在48 h 齣現反應,同時添加氮、燐顯著促進瞭浮遊植物的生長。各培養站位均檢測到大量束毛藻,加富培養後迅速減少。營養鹽的添加改變瞭海區浮遊植物原有的硅甲藻比例與各粒級葉綠素比例,陸架海區培養後的改變最為明顯,同時添加氮燐培養72 h 後,由甲藻為主的優勢種如卡氏前溝藻(Amphidinium carterae )、光亮鰭藻(Di-nophysis argus )、原甲藻(Prorocentrum sp.)轉變成瞭以硅藻為主如繞孢角毛藻(Chaetoceros cinctus )、鏇鏈角毛藻(Chaetoceros curvisetus )、放射角毛藻(Chaetoceros radicans )和丹麥細柱藻(Leptocylindrus danicus )。同時,加富實驗錶明燐痠鹽的添加促進瞭陸架海區微微型浮遊植物聚毬藻的生長。
2014년5월탑재“실험3”호과고선대남해동북부해구진행담、린영양염현장가부배양실험。수단분석적결과표명,남해동북부해구적배경삼수수착공간적변화대체가이분성3개구역:근안해구、륙가해구화륙파、해분해구。가부배양과정중근안해구화륙파、해분해구부유식물미발생현저변화。륙가해구부유식물출현현저증장,해해구부유식물가부담、린이후재48 h 출현반응,동시첨가담、린현저촉진료부유식물적생장。각배양참위균검측도대량속모조,가부배양후신속감소。영양염적첨가개변료해구부유식물원유적규갑조비례여각립급협록소비례,륙가해구배양후적개변최위명현,동시첨가담린배양72 h 후,유갑조위주적우세충여잡씨전구조(Amphidinium carterae )、광량기조(Di-nophysis argus )、원갑조(Prorocentrum sp.)전변성료이규조위주여요포각모조(Chaetoceros cinctus )、선련각모조(Chaetoceros curvisetus )、방사각모조(Chaetoceros radicans )화단맥세주조(Leptocylindrus danicus )。동시,가부실험표명린산염적첨가촉진료륙가해구미미형부유식물취구조적생장。
In situ survey of northeastern South China Sea (20°~24°N,114°~121°E),combined with nutrient (Ni-trogen and Phosphorus)enrichment experiments were conducted during a cruise of Shiyan Ⅲ in May 2014.Based on the analysis of environmental variables and water masses,the northeastern South China Sea were divided into three areas:near shore regions,continental shelf regions and deep sea basins.The incubation results showed that phytoplankton did not response significantly to enrichment during incubation in near shore and sea basin stations, whereas increased after 48 h in the area of continental shelf,especially in the group which added both nitrite and phosphate.Trichodesmium were abundant in all experiment stations,while died away quickly during incubation. The phytoplankton species composition and proportion of size fractioned Chl a also changed notably with nutrient enrichment,and the variation was more significant in shelf regions.The results of shelf regions showed that the dominant species shifted from dinoflagellates such as Amphidinium carterae ,Dinophysis argus ,Prorocentrum sp. to diatoms such as Chaetoceros cinctus ,C.curvisetus,C.radicans and Leptocylindrus danicus after incubation.Be-sides,the results also revealed that phosphate stimulated the growth of picophytoplankton synechococcus in the area of continental shelf significantly.