洞庭湖生态风险评价及阶段性特征

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Abstract

To protect Dongting Lake more effectively, it is very important to evaluate the ecological risk of Dongting Lake quantitatively. In this paper, the "Pressure-Response" model was adopted to evaluate the ecological risk status of Dongting Lake from the viewpoint of three stages from 1991 to 2015 and identify the main pressure source, stress factors and the main affected ecosystem indicators, ecosystem services of different stages. The results showed that (1) the ecological risk of Dongting Lake increased continuously from 1991 to 2015, and its main pressure source changed greatly. The main stress factors and the main affected ecosystem indicators were also changed obviously, but the main ecosystem services had no significant change. (2) The ecological risk factors of Dongting Lake were different at different stages. From 1991 to 2002, the ecological risk was influenced by both natural and social sources; From 2003 to 2010, the influence of natural sources was weakened, the influence of social sources began to emerge. From 2011 to 2015, the influence of natural sources was relatively small, and the influence of social sources was big. (3)Although the growth trend of ecological risks has slowed down in recent years, but which was still needed to strengthen protection and governance. It was to strengthen the pollution control of social sources continually in the basin, and to pay close attention to the changes of natural sources, especially the increasing of the ecological risk caused by the changes in hydrological conditions.

Key words： Dongting Lake ecological risk assessment stage characteristics

Received: 24 May 2018

PACS:

X524

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	Articles by authors
	WANG Yan-fen
	Ni Zhao-kui
	LI Xiao-xiu
	WANG Sheng-rui

Cite this article:

WANG Yan-fen,Ni Zhao-kui,LI Xiao-xiu等. The ecological risk assessment and stage characteristics of Dongting Lake[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(1): 321-329.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I1/321

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