Environmental significance of biogenic elements in surface sediments of the Changjiang Estuary and its adjacent areas

IOCAS-IR

	Environmental significance of biogenic elements in surface sediments of the Changjiang Estuary and its adjacent areas
	Yu Yu ; Jinming Song; Xuegang Li ; Huamao Yuan ; Ning Li ; Liqin Duan
发表期刊	Journal of Environmental Sciences
ISSN	1001-0742
	2013-11-01
出版年	2013
卷号	v.25 期号:11 页码:21-31
文献类型	CNKI期刊论文
摘要	Biogenic elements and six phosphorus(P) fractions in surface sediments from the Changjiang Estuary and adjacent waters were determined to investigate the governing factors of these elements, and further to discuss their potential uses as paleo-environment proxies and risks of P release from sediment. Total organic carbon(TOC) and leachable organic P(Lea-OP) showed high concentrations in the estuary, Zhejiang coast and ofshore upwelling area. They came from both the Changjiang River and marine biological input.Biogenic silicon(BSi) exhibited a high concentration band between 123 and 124°E. BSi mainly came from diatom production and its concentration in the inshore area was diluted by river sediment. Total nitrogen(TN) was primarily of marine biogenic origin. Seaward decreasing trends of Fe-bound P and Al-bound P revealed their terrestrial origins. Influenced by old Huanghe sediment delivered by the Jiangsu coastal current, the maximum concentration of detrital P(Det-P) was observed in the area north of the estuary. Similar high concentrations of carbonate fluorapatite(CFA-P) and CaCO3 in the southern study area suggested marine calcium-organism sources of CFA-P. TOC, TN and non-apatite P were enriched in fine sediment, and Det-P partially exhibited coarse-grain enrichment, but BSi had no correlation with sediment grain size. Diferent sources and governing factors made biogenic elements and P species have distinct potential uses in indicating environmental conditions. Transferable P accounted for 14%-46% of total P. In an aerobic environment,there was low risk of P release from sediment, attributed to excess Fe oxides in sediments.
关键词	biogenic elements phosphorus fractions sediment source grain size efect Changjiang Estuary and adjacent waters
CNKI专辑号	B;
CNKI专辑名称	工程科技Ⅰ辑;
CNKI专题号	B027;
CNKI专题名称	环境科学与资源利用;
分类号	X131.2
收录类别	中科院核心 ; 中科院扩展
语种	英文;
资助项目(基金）	supported by the Natural Science Foundation of China for Creative Research Groups(No.41121064) ; the National Basic Research Program (973)of China(No.2011CB403602,2010CB951802) ; the National Natural Science Foundation of China(No.41306070)
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/190699
专题	中国科学院海洋研究所
作者单位	1.KeyLaboratoryofMarineEcologyandEnvironmentalSciences,InstituteofOceanology,ChineseAcademyofSciences 2.MarineScienceandEngineeringCollege,QingdaoAgriculturalUniversity
推荐引用方式 GB/T 7714	Yu Yu,Jinming Song,Xuegang Li,et al. Environmental significance of biogenic elements in surface sediments of the Changjiang Estuary and its adjacent areas. 2013.