喀斯特地区供水水库营养演化历史重建

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Abstract Based on ²¹⁰Pb-¹³⁷Cs dating and historical flood event records, we established an accurate chronology of a lake sediment core taken from the center of South Lake, the south part of Lake Hongfeng. On the basis of this chronology, the variations in the trophic status of Lake Hongfeng from 1960 to 2016AD were reconstructed by a comprehensive analysis of geochemical measurements (e.g. loss on ignition (LOI), total organic carbon (TOC), total nitrogen (TN), C/N ratio, stable carbon isotope of organic material (δ¹³C_org), and biological silicon (BSi)), water quality parameters, and reference data. During the analyzed period, several significant changes in primary productivity and trophic status were identified. From 1991 to 1999, the trophic status had gradually evolved to eutrophication and primary productivity had been increasing consistently, this was caused by enhanced anthropogenic nutrients inputs, especially cage fish culture, which might have played an important role in this eutrophication. From 2000 to 2003, due to the implementation of a series of protection and regulation policies, the trophic status had gradually changed to mesotrophic and primary productivity was decreasing gradually. From 2004 to 2008, the trophic status reversed to eutrophication, which corresponds to the increasing of exogenous nutrients input and re-emission of deposited nutrients. Since 2009, Lake Hongfeng had been mesotropher after much stricter water quality control policies had been implemented. Though water quality had been improved significantly, the nutrients content was still on a relatively high level due to the consistent re-emission, which demonstrated that future treatment should not only focus on the reduction of exogenous pollutants, but also the containment of the endogenous sediments.

Key words： eutrophication reservoir sediment paleolimnology human activity

Received: 07 April 2020

PACS:

X524

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	Articles by authors
	SHENG En-guo
	LIU Bin
	ZHANG Zhong-yi
	PENG Hai-jun
	ZHAO Jing-jing
	LAN Jiang-hu

Cite this article:

SHENG En-guo,LIU Bin,ZHANG Zhong-yi等. Reconstruction of trophic state changes in a karst water-supply reservoir[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(12): 5403-5412.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I12/5403

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