CAJ | 학술논문

2010年4、5及10月，在长江口南部及其邻近海域典型赤潮高发区分别进行拖网和水样采集，获得浮游植物样品180个，进行硅藻种类组成与数量分析．3个航次分别鉴定出硅藻43属134种、37属126种及45属155种；3个航次共有的属有29个，分别占各航次硅藻属总数的67.44％、78.38％和64.44％．硅藻种类多样性4、10月高于5月．3个航次的种类最多硅藻均为圆筛藻（Coscinodiscus spp．）．4、5月和10月圆筛藻属的种类数目及其所占比例分别为22种（16.30％）、30种（23.62％）及26种（16.67％）．在这3个航次调查中，圆筛藻种类多样性随季节变化表现出低-高-低的特征，而硅藻种类多样性随季节变化刚好相反，呈现高-低-高的变化，两者具有一定的负相关性．硅藻细胞密度水平分布和垂直分布的的变化趋势为春季4、5月高于秋季10月．骨条藻（Skel-etonema spp．）是4、5月的数量优势种，10月没有明显优势的硅藻．硅藻数量分布的季节性变化和春季藻类赤潮、长江冲淡水通量及其流向的季节性变化有关．长江口南部及其邻近海域硅藻高值区表现出从近岸向外海降低的趋势．
2010년4、5급10월，재장강구남부급기린근해역전형적조고발구분별진행타망화수양채집，획득부유식물양품180개，진행규조충류조성여수량분석．3개항차분별감정출규조43속134충、37속126충급45속155충；3개항차공유적속유29개，분별점각항차규조속총수적67.44％、78.38％화64.44％．규조충류다양성4、10월고우5월．3개항차적충류최다규조균위원사조（Coscinodiscus spp．）．4、5월화10월원사조속적충류수목급기소점비례분별위22충（16.30％）、30충（23.62％）급26충（16.67％）．재저3개항차조사중，원사조충류다양성수계절변화표현출저-고-저적특정，이규조충류다양성수계절변화강호상반，정현고-저-고적변화，량자구유일정적부상관성．규조세포밀도수평분포화수직분포적적변화추세위춘계4、5월고우추계10월．골조조（Skel-etonema spp．）시4、5월적수량우세충，10월몰유명현우세적규조．규조수량분포적계절성변화화춘계조류적조、장강충담수통량급기류향적계절성변화유관．장강구남부급기린근해역규조고치구표현출종근안향외해강저적추세．
Analyses of the diatom composition and abundance were done on 180 net and water samples collected from frequent red-tide occurring waters in the south of Changjiang Estuary and its adjacent waters in April,May and October,2010.The diatoms recorded belong to 43 genus and 134 species,37genus and 126 species and 45 genus and 155 species,from 3 cruises,respectively.There were 29 common species,occupying 67.44%,78.38% and 64.44% of the total species in each cruise.Coscinodiscus was the most diversified group of all 3 cruises.The spe-cies number and percentage of the total diatom species were 22 species in April(16.30%),30 species in May (23.62%)and 26 species in October (16.67%).Coscinodiscus diversity showed a pattern of “low-high-low”with seasonal alterlations while the diversity of diatoms showed the opposite,characterized by a pattern of “High-Low-High”.These 2 indexes showed a negative correlation.The vertical distribution and horizontal distribution of diatom density showed that they were higher in April and May of spring than in October of autumn.Dominate dia-toms in the first and second cruises were skeletonema spp.,while they didn't dominate in the third cruise.Density distribution of diatoms was related to spring's algae bloom,the diluted water flux of Changjiang River and current direction.Diatom density showed a decrease tendency from offshore to open waters in the South of Changjiang Estu-ary and its adjacent waters.