典型高原湖泊流域生态安全格局构建——以杞麓湖流域为例

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Abstract

With the goal of "source" and environment protection, the minimum accumulated resistance model (MCR) was used to quantitatively study the ecological security pattern in the Qilu lake basin. The results showed that:The average eco-safety index of the Qilu Basin was 2.59 and the ecological safety was mainly dominated by a lower degree of safety,accounting for 36.33% of the total area of the basin; Then it is followed by the levels of moderate safety and insecurity, accounting for 23.36% and 22.53% of the total basin area, respectively; the safest area was the smallest, accounting for only 17.77% of the total basin area; the lower safety zones were mainly distributed in the northwest, southeast and southwest, and ecological protection construction in these areas should be strengthened; Regarding as the ecological source, the slope, elevation, vegetation coverage, land cover type, distance from water body, distance from construction land, distance from residential area, distance from road were selected as indexes. The ecological source which was the area of the natural forest land, important reservoir and lake buffer within 100m. These factors combined with the MCR model and the cost-distance analysis module of GIS, generated the minimum cumulative distance of consumption surface and it was divided into five levels; based on the characteristics of the frequency of cumulative resistance changes, five ecological functional zones were identified:ecological buffer zone, ecological transition zone, ecological marginal zone, agricultural cultivation zone and human activity zone. The total area of ecological resources in the Qilu Lake basin was 126.87km², accounting for 35.74% of the total area of the basin. Ecological sources have large differences in area, number, and spatial distribution. The spatial distribution pattern of ecological sources was concentrated around the corners but scattered in the middle. The ecological corridor is continuous and compact, with a scattered and fragmented space in the middle. There was a big difference in the spatial resistance values of ecological nodes, and some ecological nodes have a relatively large accumulated resistance. Those nodes are located in the area which had the largest basin's landscape cumulative resistance value and have a great influence on the flow security of ecological flows. Based on the minimum cumulative resistance surface, combined with the Hydrology module of GIS, a structured watershed landscape ecological security pattern was constructed with an ecological source, 19ecological nodes, and 23ecological corridors. Moreover corresponding suggestions were put forward. It has a certain reference value for the study of plateau lake basins and ecological environment protection.

Key words： ecological security ecological security pattern minimum cumulative resistance model ecological environment Qilu lake basin

Received: 03 July 2018

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X524

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	Articles by authors
	ZHAO Xiao-qing
	TAN Kun
	YI Qi
	LI Si-nan
	MIAO Pei-pei
	PU Jun-wei

Cite this article:

ZHAO Xiao-qing,TAN Kun,YI Qi等. Construction of ecological security pattern in typical plateau lake basin——A case of the Qilu Lake basin[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(2): 768-777.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I2/768

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