四川巴中地区生态源地识别及生态安全格局构建

doi:10.11707/j.1001-7488.LYKX20250321

Abstract

Abstract:

Objective: Through a comprehensive analysis of multiple ecological indicators, this study constructed a regional ecological security pattern in Bazhong, Sichuan Province by identifying key ecological sources and optimizing ecological corridors. The findings offer a scientific foundation for facilitating biological movement and sustaining biodiversity and ecological equilibrium in the Daba Mountains. Method: Those indicators, such as theimportance of regional ecosystem services, ecological sensitivity, and landscape connectivity, were chosen for determining the ecological source areas in Bazhong. Based on methods such as Linkage Pathways, Pinchpoint Mapper, and Barrier Mapper, the ecological niche resistance surface was calculated, the regional ecological corridors and nodes were identified, and the ecological security pattern of Bazhong was constructed. Result: The overall level of ecosystem services in Bazhong was relatively high, with higher levels in the north than in the south. The areas of high and extremely important ecosystem services were 2 147.13 and 2 607.24 km², respectively, mainly distributed in Nanjiang county, Tongjiang county, and Pingchang county. A total of 23 ecological source areas were identified in the entire region, with a total area of 2 484 km², accounting for 20% of the total area, mainly concentrated in the northern region. A total of 61 ecological corridors were identified, with a total length of 2 459 km, including 23 critical corridors and 38 general corridors. A total of 7 742 hm² of extremely important ecological protection areas were identified and determined, with 5 029 hm² of first level ecological barrier restoration areas, and 65 ecological fault points in the ecological network, which are key areas that need to be protected and restored in Bazhong ecosystem. Conclusion: The key conservation and restoration areas in Bazhong’s ecological network, which span four ecosystem types “forestland & mountains, cropland, high-density built-up areas, and rivers & lakes” are explicitly delineated. The proposed “One Screen, Two Belts, Three Zones” strategy for constructing the ecological security pattern presents a well-defined framework that clearly highlights these conservation and restoration priorities.

Key words: ecological security pattern, ecological source area, ecosystem services, ecological sensitivity, ecological corridors

CLC Number:

S718

Jienan Ye,Yizhou Huang,Shuhao Jia,Ting Zhang. Identification of Ecological Sources and Construction of an Ecological Security Pattern in Bazhong, Sichuan Province[J]. Scientia Silvae Sinicae, 2025, 61(11): 56-69.

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指标Index	因子Factor	敏感性等级赋值 Sensitivity level assignment
指标Index	因子Factor	1：一般敏感 Generally sensitive	2：较敏感 Fairly sensitive	3：中度敏感 Moderately sensitive	4：高度敏感 Highly sensitive	5：极度敏感 Extremely sensitive
地质敏感性 Geological sensitivity	坡度Slope/（°）	0~9.85	9.86~17.44	17.45~25.26	25.27~34.63	34.64~74.50
	坡向 Aspect	平地或正南 Flat or south	东南或西南 Southeast or southwest	正东或正西 East or west	东北或西北 Northeast or northwest	正北 North
	高程 Elevation/m	0~578	579~833	834~1 135	1 136~1 522	1 523~2 490
	地形起伏度 Topographic relief	0~94	95~149	150~207	208~282	283~659

自然资源敏感性 Natural resource sensitivity	距河流的距离 Distance from river/m	≥1 001	801~1 000	601~800	401~600	200~400
	距湖泊的距离 Distance from lake/m	≥8 001	6 001~8 000	4 001~6 000	2 001~4 000	0~2 000
	土地利用类型 Land use type	建设用地 Built-up land	未利用地 Unused land	耕地 Cropland	水域和草地 Water and grassland	林地 Forest land
	植被覆盖度 Vegetation coverage	0~0.30	0.31~0.47	0.48~0.57	0.58~0.64	0.65~0.89

人活动敏感性 Sensitivity to human activities	人口密度 Population density/km^?2	5 641~18 748	1 902~5 640	525~1 901	146~524	0~145
	夜间灯光指数 Nighttime light index	15.23~23.52	9.88~15.22	5.91~9.87	2.77~5.90	0~2.76
	距道路的距离 Distance from road/m	0~100	101~200	201~300	301~400	≥401

阻力因子 Resistance factor	阻力值Resistance value					权重 Weight	参考文献 References
阻力因子 Resistance factor	1	2	3	4	5	权重 Weight	参考文献 References
土地利用类型 Land use type	林地 Forest land	耕地和草地 Cropland and grassland	水域 Water	未利用地 Unused land	建设用地 Built-up land	0.303 8	Guo et al.，2025
高程Elevation/m	0~578	579~833	834~1 135	1 136~1 522	1 523~2 490	0.145 8	Zhang et al.，2024
坡度Slope/（°）	0~9.85	9.86~17.44	17.45~25.26	25.27~34.64	34.65~74.50	0.145 8	弓灏洁等，2023
距道路的距离 Distance from road/m	401~2 000	301~400	201~300	101~200	0~100	0.072 8	晁云舒等，2023
距河流的距离 Distance from river/m	0~2 000	2 001~4 000	4 001~6 000	6 001~8 000	≥8 001	0.092 1	杨学龙等，2023
植被覆盖度 Vegetation coverage	0.65~0.89	0.58~0.64	0.48~0.57	0.32~0.47	0~0.31	0.239 8	刘瑞宽等，2023

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Identification of Ecological Sources and Construction of an Ecological Security Pattern in Bazhong, Sichuan Province

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