Size-fractionated phytoplankton biomass in autumn of the Changjiang(Yangtze) River Estuary and its adjacent waters after the Three Gorges Dam construction

IOCAS-IR

	Size-fractionated phytoplankton biomass in autumn of the Changjiang(Yangtze) River Estuary and its adjacent waters after the Three Gorges Dam construction
	Song SQ(宋书群); Sun J(孙军); Luan QS(栾青杉); Shen ZL(沈志良)
发表期刊	Chinese Journal of Oceanology and Limnology
ISSN	0254-4059
	2008-08-15
出版年	2008
卷号	v.26 期号:03 页码:38-45
文献类型	CNKI期刊论文
摘要	A cruise was undertaken from 3rd to 8th November 2004 in Changjiang(Yangtze) River Estuary and its adjacent waters to investigate the spatial biomass distribution and size composition of phytoplankton.Chlorophyll-a(Chl-a) concentration ranged 0.42-1.17 μg L-1 and 0.41-10.43 μg L-1 inside and outside the river mouth,with the mean value 0.73 μg L-1 and 1.86 μg L-1,respectively.Compared with the Chl-a concentration in summer of 2004,the mean value was much lower inside,and a little higher outside the river mouth.The maximal Chl-a was 10.43 μg L-1 at station 18(122.67°E,31.25°N),and the region of high Chl-a concentration was observed in the central survey area between 122.5°E and 123.0°E.In the stations located east of 122.5°E,Chl-a concentration was generally high in the upper layers above 5 m due to water stratification.In the survey area,the average Chl-a in sizes of >20 μm and <20 μm was 0.28 μg L-1 and 1.40 μg L-1,respectively.High Chl-a concentration of <20 μm size-fraction indicated that the nanophytoplankton and picophytoplankton contributed the most to the biomass of phytoplankton.Skeletonema costatum,Prorocentrum micans and Scrippsiella trochoidea were the dominant species in surface water.The spatial distribution of cell abundance of phytoplankton was patchy and did not agree well with that of Chl-a,as the cell abundance could not distinguish the differences in shape and size of phytoplankton cells.Nitrate and silicate behaved conservatively,but the former could probably be the limitation factor to algal biomass at offshore stations.The distribution of phosphate scattered considerably,and its relation to the phytoplankton biomass was complicated.
关键词	size-fractionated phytoplankton chlorophyll-a Changjiang(Yangtze) River Estuary Skeletonema costatum Prorocentrum micans environmental factor
CNKI专辑号	A;D;
CNKI专辑名称	基础科学;农业科技;
CNKI专题号	D052;
CNKI专题名称	水产和渔业;
分类号	S932.8
收录类别	中科院核心
语种	英文;
资助项目(基金）	Supported by the National Natural Sciences Foundation (No. 50339040) ; Knowledge Innovation Program of Chinese Academy of Sciences (KZCX2-YW-213 and KZCX3-SW-232)
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/192895
专题	中国科学院海洋研究所
作者单位	1.KeyLaboratoryofMarineEcologyandEnvironmentalSciences,InstituteofOceanology,ChineseAcademyofSciences,Qingdao266071,China 2.GraduateSchooloftheChineseAcademyofSciences,Beijing100039,China
推荐引用方式 GB/T 7714	Song SQ,Sun J,Luan QS,et al. Size-fractionated phytoplankton biomass in autumn of the Changjiang(Yangtze) River Estuary and its adjacent waters after the Three Gorges Dam construction. 2008.