CAJ | 학술논문

2010年10月至2011年9月对长江口北支水域的浮游植物进行周年调查，共采集到183种（包括变种和变型），隶属于7门60属，其中硅藻门种类最多，有35属137种，占浮游植物总种类数的75％。周年优势种为具槽直链藻、中肋骨条藻、条纹小环藻、两栖颤藻、小伪菱形藻双楔变种、颗粒直链藻和小环藻未定种。本次调查中，季节间浮游植物的丰度差异不显著（P＞0.05），但各月间浮游植物丰度差异显著（P＜0.05），全年丰度在2.83×103～6.18×104cells/L之间，其中6月的丰度最高，1月的丰度最低，全年的平均丰度为1.73×104cells/L。 Pearson相关性分析显示，浮游植物丰度与硝酸盐浓度显著正相关（P＜0.05），与氨氮浓度极显著正相关（P＜0.01），含氮营养盐对浮游植物的影响明显。
2010년10월지2011년9월대장강구북지수역적부유식물진행주년조사，공채집도183충（포괄변충화변형），대속우7문60속，기중규조문충류최다，유35속137충，점부유식물총충류수적75％。주년우세충위구조직련조、중륵골조조、조문소배조、량서전조、소위릉형조쌍설변충、과립직련조화소배조미정충。본차조사중，계절간부유식물적봉도차이불현저（P＞0.05），단각월간부유식물봉도차이현저（P＜0.05），전년봉도재2.83×103～6.18×104cells/L지간，기중6월적봉도최고，1월적봉도최저，전년적평균봉도위1.73×104cells/L。 Pearson상관성분석현시，부유식물봉도여초산염농도현저정상관（P＜0.05），여안담농도겁현저정상관（P＜0.01），함담영양염대부유식물적영향명현。
An annual survey was conducted on the community structure of phytoplankton from October 2010 to September 2011 at 5 sta-tions in the north branch of the Yangtze River estuary .A total of 183 phytoplankton species were identified , which belonged to 60 gene-ra of 7 phyla.Diatom was the major phytoplankton group which was 137 species of 35 genera and its species number accounted for 75%of all species .Melosira sulcata, Skeletonema costatum, Cyclotella striata, Oscillatoria amphibia, Pseudo-Nitzschia sicula v.Bicu-neata, Cyclotella sp.and Melosira granulata were the dominant species .Phytoplankton abundance difference was not significant among seasons ( p>0.05 ) , but monthly difference was significant ( p<0.05 ) .Phytoplankton density ranged from 2.83 ×10 3 to 6.18 ×10 4 cells/L with the nighest density in June and the lowest density in January .The annual average abundance was 1.73 10 4 cells/L.Corre-lation analysis found that the density of phytoplankton was significantly positively correlated to nitrate and ammonia .The impact of ni-trogenous nutrients for phytoplankton was significantly .