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在不同的氮源(硝酸钠、氯化铵、尿素)、不同的磷源(磷酸二氢钠、甘油磷酸钠、三磷酸腺苷二钠)和不同的营养盐输入方式(一次性输入、每2d输入、每5d 输入)下，对三角褐指藻、小新月菱形藻、杜氏盐藻、青岛大扁藻、米氏凯伦藻和前沟藻进行混合培养实验，研究营养盐形态及输入方式对6种海洋微藻群落演替的影响。实验结果表明，以硝酸钠和氯化铵为氮源时，硅藻为优势种，分别占总细胞密度的56.0%和58.4%，而以尿素为氮源时，绿藻有一定的优势，占总细胞密度的56.5%；以磷酸二氢钠和甘油磷酸钠为磷源时硅藻具有竞争优势，分别占总细胞密度的56.0%和59.6%，但以三磷酸腺苷二钠为磷源时，绿藻为优势种，占总细胞密度的80.0%；不同的营养盐输入方式下，硅藻都能保持一定的竞争优势，一次性输入、每2d输入、每5d输入方式下，硅藻分别占总细胞密度的63.2%、85.6%和60.4%，其中每2d输入方式下，硅藻竞争优势最大。在所有的处理组中，甲藻都受到严重的抑制，只能占有很小的比例。“,”In this paper,six marine microalgal species(Phaeodactylum tricornutum,Nitzschia closterium f.minutissima,Dunaliella salina,Platymonas helgolandica var.tsingtaoensi,Karenia mikimotoi and Amphidinium carterae)were mixed cultured under different nitrogen sources (NaNO3,NH4Cl,CO (NH2)2),different phosphorous sources (NaH2PO4,glycerophosphate,adenosine triphosphate diso-dium)and different nutrient input modes (input one time,input every 2 days,input every 5 days)in order to study the effects of nutrient sources and input modes on the community succession of six mi-croalgal species.The results showed that when NaNO3 and NH4Cl were nitrogen sources,diatoms were the dominant algae and accounted for 56.0% and 58.4% of the total cell densities,respectively, while green algae had competitive advantage when urea was nitrogen source and accounted for 56.5% of the total cell density.When NaH2PO4 and glycerophosphate were phosphorus sources,diatoms were the competitive species and accounted for 56.0% and 59.6% of the total cell densities,respectively, while green algae were dominants when adenosine triphosphate disodium was phosphorus source,ac-counting for 80.0% of the total cell density.The diatoms were all dominant in different nutrient input modes and accounted for 63.2%,85.6% and 60.4% of the total cell densities,respectively,when the nutrients were input one time,input every 2 days and input every 5 days,with the highest competitive-ness occurred in every 2 days input mode.Dinoflagellates were inhibited and only occupied small per-centages of the total cell densities in all treatments.