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

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...

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

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.