基于MCR模型和DO指数的九江滨水城市生态安全网络构建

doi:10.11821/dlxb202011014

Abstract

Abstract:

It is of vital importance to construct an ecological security network that considers both the ecological protection and the economic growth to ensure the sustainable development in waterfront cities. Based on the ecological and industrial data of Jiujiang city, we develop a comprehensive ecological security evaluation framework using the minimum cumulative resistance (MCR) model and the Duranton and Overman (DO) index. Specifically, the MCR is applied to examine the ecological landscape pattern while the DO index is introduced to analyze the degree of industrial agglomeration in continuous large areas and economic production zones. Subsequently, the eco-economic strategic nodes and green infrastructure belts are identified based on spatial conflicts between the ecological landscape patterns and economic production zones. The results demonstrate that: (1) Jiujiang city contains 29 important ecological sources with a total area of 7323 km². The areas with high-value of ecological security resistance account for 39.69%, which are distributed in the contiguous areas in the central and eastern parts of the city. In contrast, the low-value areas are on the city's periphery where there were fewer connected transition areas, which exhibit a spatially polarized "center-periphery" ecological landscape pattern. (2) The economic production zone is close to water sources, which presents spatial patterns of small-scale agglomeration and large-scale dispersion. The average length and number of agglomeration intervals are decreasing in heavily polluted, lightly polluted, and moderately polluted industries. (3) By analyzing the ecological sources, the resistance surface as well as the economic production zone, we determined ecological corridors with a length of 685.57 km and 25 eco-economic strategic nodes. As such, 18 important green infrastructure belts with a total length of 424.53 km and 26 regular green infrastructure belts with a total length of 662.46 km are designed to increase connectivity and maintain ecological processes. All of these elements constitute a "honeycomb" pattern of the ecological security network in Jiujiang city. This study expands the agglomeration economy perspective of the traditional ecological security network construction framework, and explores the data fusion of different scales. The study could contribute to scientific references for environmental management and regional sustainable development.

Key words: ecological security network, minimum cumulative resistance model, Duranton and Overman index, Jiujiang city

DAI Lu, LIU Yaobin, HUANG Kaizhong. Construction of an ecological security network for waterfront cities based on MCR model and DO index: A case study of Jiujiang city[J].Acta Geographica Sinica, 2020, 75(11): 2459-2474.

Figures/Tables 8

Fig. 1

Fig. 2

Tab. 1

Fig. 3

Tab. 2

The global agglomeration information of major manufacturing industries in Jiujiang city

行业代码及名称	全局集聚双边距离区间(km)	数量占比 (%)	平均长度($\overline{Δd}$)	$集聚度$ ( $Γ A$ )	污染分级
Code 30非金属矿物制品业	[16.19, 22.81], [23.81, 39.25]	9.90	11.03	0.26	重度
Code 17纺织业	[0, 9.83], [58.40, 63.00]	7.65	7.21	0.18	重度
Code 26化学原料和化学制品制造业	[0, 4.73]	3.16	4.73	0.21	重度
Code 18纺织服装、服饰业	[0, 5.42], [7.43, 13.80], [21.67,24.51], [38.99, 44.35], [50.65, 51.28]	22.20	4.12	1.08	中度
Code 33金属制品业	[0, 3.02], [27.34, 29.48], [44.23, 49.27]	5.24	3.40	0.11	中度
Code 19皮革、毛皮、羽毛及其制品和制鞋业	[0, 1.64], [42.78, 43.34]	3.42	1.10	0.09	中度
Code 38电气机械和器材制造业	[0, 7.81], [58.72, 61.93]	4.38	5.51	1.55	轻度
Code 37铁路、船舶、航空航天和其他运输设备制造业	[0, 3.59], [5.17, 14.93], [17.01, 23.37],[34.90, 36.86]	3.28	5.42	1.36	轻度
Code 34通用设备制造业	[0,15.94], [30.05, 31.50], [40.38, 41.20],[42.27, 46.56]	3.04	5.62	0.66	轻度

Tab. 2

Fig. 4

Fig. 5

Tab. 3

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驱动力	阻力因子
驱动力	自然禀赋		人类开发		环境响应
阻力值	坡度(°)	土地利用类型	景观破碎度	与公路距离(m)	水质分级	NDVI
1	0~4.55	林地	0.30~0.52	> 12563	Ⅰ	0.83~0.92
2	4.55~11.12	耕地	0.52~0.96	7336~12563	Ⅱ	0.71~0.83
3	11.12~18.45	草地和未利用地	0.96~1.38	4126~7336	Ⅲ	0.53~0.71
4	18.45~26.78	水域	1.38~1.99	1650~4126	Ⅳ	0.28~0.53
5	26.78~64.43	建设用地	1.99~2.44	< 1650	Ⅴ	0.00~0.28
权重	0.07	0.20	0.29	0.19	0.14	0.11
参考文献	[43]	[44]	[45]	[38]	[46]	[47]

网络指数	网络闭合度α	网络连接度β	网络连通率γ
布局前	0.09	2.28	0.41
布局后	0.23	2.85	0.49
变化率(%)	147.08	25.31	21.16

Construction of an ecological security network for waterfront cities based on MCR model and DO index: A case study of Jiujiang city

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