基于MSPA-InVEST模型的陇南市生态安全格局时空演变

doi:10.13866/j.azr.2025.06.13

Abstract

Abstract:

Accurate identification for ecological restoration is essential for promoting sustainable ecological development. Longnan City, as a crucial water source conservation area and ecological security barrier in the upper reaches of the Yangtze River, plays a critical role in maintaining the regional ecological balance. This study used the InVEST model to evaluate ecosystem services and combined the morphological spatial pattern analysis (MSPA) method with circuit theory to construct the ecological security pattern of Longnan City, then analyze its evolution. The results showed: (1) From 2000 to 2022, the number of ecological source areas increased, primarily distributed in the Kang County, Hui County, and Cheng County. The spatial distribution exhibited a pattern of higher density in the south and lower in the north. (2) The average resistance value first decreased then increased, while the length of ecological corridors initially increased and later decreased, during the study period with a net reduction of approximately 508.94 km. Spatially, the corridors shifted from central to southeastern regions. (3) Ecological bottleneck areas, primarily dominated by forests, croplands, and grasslands, were concentrated in low-resistance zones. Their total area decreased annually, with a net reduction of about 144.84 km² over the study period. Ecological obstacles also decreased in both number and area, mainly clustered in Wudu County, Li County, and Tanchang District. Thus, the research results provide a scientific foundation for the formulation of ecological restoration plans and promotion of high-quality regional economic development in Longnan City. The findings provide scientific support for formulating ecological restoration plans and promoting high-quality economic development in Longnan City.

Key words: ecosystem service, ecological security pattern, InVEST model, MSPA method, Longnan City

LI Zhiming, ZHANG Guofei, XING Jie, YANG Lei, WANG Weidong, CAO Juan. Spatiotemporal evolution of the ecological security pattern in Longnan City based on the MSPA-InVEST model[J].Arid Zone Research, 2025, 42(6): 1103-1113.

Figures/Tables 9

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References 30

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数据名称	分辨率	数据用途	数据来源
土地覆盖类型	30 m	量化生态系统服务、识别潜在生态源地	武汉大学中国土地覆盖数据集（CLCD）（https://zenodo.org/records/12779975）
高程（DEM）	30 m	计算坡度、地形起伏度等地形因子	地理空间数据云网站（http://www.gscloud.cn/）
Landsat 7 TM+、Landsat 8 OLI遥感影像	30 m	计算植被覆盖度（NDVI）	地理空间数据云网站（http://www.gscloud.cn/）
降水量	1 km	计算平均的年降水量、降雨侵蚀力因子等	国家地球系统科学数据中心（http://www.geodata.cn/index.html）
潜在蒸散发量	1 km	计算平均的潜在蒸散发量	国家地球系统科学数据中心（http://www.geodata.cn/index.html）
土壤数据	1 km	计算土壤侵蚀因子、土壤最大根系埋藏深度等	世界土壤数据库（http://www.fao.org/soils-portal/soil-survey/soil-maps-and-databases/harmonized-world-soil-database-v12/en/）
交通道路	-	构建综合阻力面	开放街道地图（OSM）开源数据（https://www.openstreetmap.org）
河流	-	构建综合阻力面	开放街道地图（OSM）开源数据（https://www.openstreetmap.org）
居民点	-	构建综合阻力面
自然保护区边界	-	后续结果分析

区县	2000年		2005年		2010年		2015年		2020年		2022年		面积变化/km²
区县	面积/km²	占比/%	面积/km²	占比/%	面积/km²	占比/%	面积/km²	占比/%	面积/km²	占比/%	面积/km²	占比/%	面积变化/km²
武都区	1041.47	12.04	1063.70	12.02	1093.48	12.01	1058.38	11.64	1350.36	13.05	1190.7	11.59	149.23
成县	422.60	4.89	519.49	5.87	538.66	5.91	495.01	5.44	664.96	6.43	713.30	6.94	290.70
文县	2849.99	32.96	2838.50	32.07	2860.18	31.40	2846.87	31.30	3011.10	29.11	3000.56	29.20	150.57
宕昌县	599.12	6.93	619.09	6.99	631.06	6.93	658.59	7.24	670.13	6.48	690.84	6.72	91.72
康县	1303.71	15.08	1365.79	15.43	1433.83	15.74	1453.08	15.97	1811.91	17.52	1792.16	17.44	488.45
西和县	192.51	2.22	196.98	2.23	203.96	2.24	210.88	2.32	289.76	2.80	257.28	2.50	64.77
礼县	172.86	2.00	176.17	1.99	181.71	1.99	186.61	2.05	76.99	0.74	77.28	0.75	-95.58
徽县	1156.97	13.38	1160.63	13.11	1238.55	13.60	1248.12	13.72	1510.17	14.60	1540.43	14.99	383.46
两当县	907.56	10.50	910.58	10.29	927.04	10.18	938.29	10.32	959.17	9.27	1014.57	9.87	107.01
合计	8646.79	100	8850.94	100	9108.48	100	9095.82	100	10344.55	100	10277.10	100	1630.31

区县	生态障碍点面积/km
区县	2000年	2005年	2010年	2015年	2020年	2022年
武都区	16.49	-	14.65	25.86	11.97	3.76
成县	-	-	-	-	-	2.38
文县	-	1.17	-	-	3.56	-
宕昌县	35.16	-	24.14	27.04	-	-
康县	-	-	-	-	3.44	1.15
西和县	3.54	-	4.92	-	-	-
礼县	8.03	1.46	5.56	-	-	1.01
徽县	-	-	-	-	-	-
两当县	-	-	-	-	-	-
合计	63.21	2.62	49.27	52.90	18.98	8.30

Spatiotemporal evolution of the ecological security pattern in Longnan City based on the MSPA-InVEST model

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