滃江长湖水库沉积物营养元素沉积历史重构及源解析

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Abstract

To investigate the impacts of urbanization processes, water conservancy project and human activities on the evolution trend of river water environment, sediment core (CH1) was collected in the Changhu Reservoir, Wengjiang River basin, in September 2015. Measurements of sediment unsupported ²¹⁰Pb (²¹⁰Pb_ex) activity, TOC, TN, TP content, δ¹³C and particle size were conducted. The results showed that the sedimentary record of CH1 was obtained in about 58years. The average contents of TOC, TN and TP in the sediment core were 1.07% (range:0.65%~1.66%), 0.12% (0.08%~0.20%), 438.00mg/kg (294.74~675.44mg/kg). Vertical distribution characteristics of TOC, TN and TP in the sediment core of the reservoir showed that before 1957, the TN, TP and TOC content of sediment core exhibited a slowly increasing trend, the content initially increased and then decreased in 1957 to 1991, and generally increased from 1991 to 2015. However, the storm flood occurred in 1994 significantly changed the sediment particle composition, thus decreasing TOC, TN and TP content. In combination with characteristics of C/N and δ¹³C, the source of organic matter was mainly identified as the mixture of terrestrial and aquatic sources, and the dam construction mainly resulted in the input of terrigenous organic matter in the reservoir area.

Key words： Changhu Reservoir sediment core chronology biogenic substances source identification

Received: 08 February 2017

PACS:	P597
	X524

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	Articles by authors
	ZENG Hong-ping
	GAO Lei
	CHEN Jian-yao
	ZHANG Kai
	JIANG Tao
	LI Kun

Cite this article:

ZENG Hong-ping,GAO Lei,CHEN Jian-yao等. Historical reconstruction and source identification of sediment nutrient elements in the Changhu Reservoir, Wengjiang River[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(10): 3910-3918.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2017/V37/I10/3910

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