Nutrients in the Changjiang River

	Nutrients in the Changjiang River
	Shen, Zhi-Liang; Liu, Qun
	2009
发表期刊	ENVIRONMENTAL MONITORING AND ASSESSMENT
ISSN	0167-6369
卷号	153 期号:40182 页码:27-44
摘要	N, P and SiO3-Si in the Changjiang mainstream and its major tributaries and lakes were investigated in the dry season from November to December, 1997, and in the flood season in August and October, 1998. An even distribution of SiO3-Si was found along the Changjiang River. However, the concentrations of total nitrogen, total dissolved nitrogen, dissolved inorganic nitrogen, nitrate and total phosphorus, total particulate phosphorus increased notably in the upper reaches, which reflected an increasing impact from human activities. Those concentrations in the middle and lower reaches of the Changjiang River were relatively constant. Dissolved N was the major form of N and the particulate P was the major form of P in the Changjiang River. The molar ratio of dissolved N to dissolved P was extremely high (192.5-317.5), while that of the particulate form was low (5.6-37.7). High N/P ratio reflected a significant input of anthropogenic N such as N from precipitation and N lost from water and soil etc. Dissolved N and P was in a quasi-equilibrium state in the process from precipitate to the river. In the turbid river water, light limitation, rather than P limitation, seemed more likely to be a controlling factor for the growth of phytoplankton. A positive linear correlationship between the concentration of dissolved N and the river's runoff was found, mainly in the upper reaches, which was related to the non-point sources of N. Over the past decades, N concentration has greatly increased, but the change of P concentration was not as significant as N. The nutrient fluxes of the Changjiang mainstream and tributaries were estimated, and the result showed that the nutrient fluxes were mainly controlled by the runoff, of which more than a half came from the tributaries. These investigations carried out before water storage of the Three Gorges Dam will supply a scientific base for studying the influences of the Three Gorges Dam on the ecology and environment of the Changjiang River and its estuary.
关键词	East China Sea Coastal Eutrophication Chesapeake Bay Water-quality World Rivers Long-term Nitrogen Phytoplankton Phosphorus Pollution
学科领域	Environmental Sciences
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收录类别	sci
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/2632
专题	海洋生态与环境科学重点实验室
推荐引用方式 GB/T 7714	Shen, Zhi-Liang,Liu, Qun. Nutrients in the Changjiang River[J]. ENVIRONMENTAL MONITORING AND ASSESSMENT,2009,153(40182):27-44.
APA	Shen, Zhi-Liang,&Liu, Qun.(2009).Nutrients in the Changjiang River.ENVIRONMENTAL MONITORING AND ASSESSMENT,153(40182),27-44.
MLA	Shen, Zhi-Liang,et al."Nutrients in the Changjiang River".ENVIRONMENTAL MONITORING AND ASSESSMENT 153.40182(2009):27-44.

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