氮形态组成对海洋浮游植物群落结构的影响与动力学研究  

The Study of Effects of Nitrogen Forms on Marine Phytoplankton Community Structure and Related Dynamics

作　　者：郜培怡 李克强[1] 陈衎 梁生康[1] 王修林[1] GAO Pei-Yi;LI Ke-Qiang;CHEN Kan;LIANG Sheng-Kang;WANG Xiu-Lin(Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China)

机构地区：[1]中国海洋大学海洋化学理论与工程技术教育部重点实验室,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2021年第5期57-71,共15页Periodical of Ocean University of China

基　　金：国家重点研究发展项目(2018YFC1407600);山东省重大科技创新工程项目(2019JZZY020705);中央高校基本科研业务费专项项目(201962008);国家自然科学基金项目(U1706215,41676062,NORC2018-01)资助。

摘　　要：海洋浮游植物群落结构的改变与营养盐结构有关,不同形态氮可能会影响优势种生长从而改变浮游植物群落结构。本文针对莱州湾硅藻向甲藻潜在的种群演替问题,通过船基围隔生态系现场氮加富培养实验,研究NO3-N、NH4-N、陆源有机氮(DONts)和藻源有机氮(DONss)对海洋浮游植物群落结构的影响。结果表明,在NO3-N、NH4-N和DONts加富培养条件下,舟形藻(Navicula spp.,优势度60.4%)、丹麦细柱藻(Leptocylindrus danicusm,56.6%)和密连角毛藻(Chaetoceros densus,57.4%)等硅藻是优势种,在DONss加富培养条件下,春膝沟藻(Gonyaulax verior,60.2%)等甲藻为优势种,说明硅藻主要吸收无机态营养盐成为优势种,而甲藻能够吸收DON成为优势藻。动力学过程分析发现,春膝沟藻(G.verior)等甲藻可以直接吸收利用DONss,而DONts可能是通过矿化转化为无机氮,再被密连角毛藻(C.densus)等硅藻吸收与利用。本文研究成果,有助于对硅藻向甲藻演替的营养盐动力学控制机制的认识。The change of marine phytoplankton community structure is related to the structure of nutrients.Different forms of nitrogen may affect the growth of dominant species and also change the structure of phytoplankton community.In this paper,in view of the potential population succession of diatoms to dinoflagellates in Laizhou Bay,through the field culture experiment of ship-based enclosure ecosystem,the effects of NO3-N,NH4-N,organic nitrogen(DONts)from off-shore sources and marine autogenic organic nitrogen(DONss)on marine phytoplankton community structure were analizd.The results showed that,under the enrichment culture conditions of NO3-N,NH4-N and DONts,the dominant species were Navicula spp.(60.4%),Leptocylindrus danicus(56.6%)and Chaetoceros densus(57.4%).Under DONss enrichment culture conditions,dinoflagellates such as Gonyaulax verior(60.2%)were the dominant species.The reason is that diatoms mainly absorb inorganic nutrients and therefore become dominant species under NO3-N,NH4-N and DONts enrichment,and dinoflagellate can absorb DON and consequently become the dominant algae under DONss enrichment.Through dynamic process analysis,it was found that G.verior and other dinoflagellates can directly absorb and utilize DONss,while DONts may be converted to inorganic nitrogen through mineralization,and then be absorped and utilized by C.densus and other silicon algae.The research results in this paper can enhance the understanding for the dynamic nutrients control mechanism of succession from diatoms to dinoflagellates.

关 键 词：硅藻 甲藻 溶解有机氮 营养盐动力学 莱州湾 氮营养盐 

分 类 号：P734.4[天文地球—海洋化学]