基于景观生态安全的神木市生态廊道识别与优化

doi:10.13866/j.azr.2021.04.24

Abstract

Abstract:

In this study, the ecological security of the Shenmu City landscape was evaluated to optimizing its ecological pattern. Principal component analysis, the natural break point method, and the multivariate curve resolution (MCR) model were used to obtain the distribution of the ecological security pattern in Shenmu City, China. Then, the ecological source area was extracted and the MCR model was used to construct the ecological corridor that optimizes the ecological landscape pattern. The results showed that the landscape security of Shenmu City is divided into five levels: The first level area is mostly located in the northwest, with a few areas distributed in the southeast and the northern marginal areas; the secondary and tertiary regions are distributed in fragmented phases throughout the whole region; due to the impact of human activities and natural conditions, the fourth and fifth level regions are concentrated and distributed in the central construction area, with the southeast gully crisscross area of fragmented distribution. Of the 121 ecological corridors in Shenmu City, 19.08% exist independently, and 43.51% are not connected to the main ecological corridor group. Thus, 10 new ecological corridors were designed, with a total length of 76.69 km to improve the ecological corridor network and strengthen the connection between the independent ecological corridors and the ecological source land. The results of this study are of great significance to optimize the landscape ecological environment of Shenmu City and to construct an ecological security pattern.

Key words: ecological corridor, landscape ecological security evaluation, minimum cumulative resistance model, Shenmu City

WU Jinhua,LIU Siyu,BAI Shuai. Identification and optimization of ecological corridors in Shenmu City based on landscape ecological security[J].Arid Zone Research, 2021, 38(4): 1120-1127.

Figures/Tables 7

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References 24

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评价因子		因子分级					权重	权重和
评价因子		1级	2级	3级	4级	5级	权重	权重和
外部条件	坡度/(°)	≤2	2~6	6~15	15~25	>25	0.13	0.53
	距离水体的距离/m	≤500	500~1000	1000~1500	1500~2000	>2000	0.06
	距离道路的距离/m	>5000	3000~5000	2000~3000	1000~2000	≤1000	0.09
	距离居民点的距离/m	>2000	1500~2000	1000~1500	500~1000	≤500	0.13
	土地利用类型	林地、河流水面、湖泊水面、水库水面	园地、天然草地、人工草地	耕地、设施农用地、农村道路、坑塘水面、沟渠、田坎、沿海滩涂、内部滩涂、沼泽地		城市、建制镇、村庄、街巷用地、风景名胜及特殊用地、采矿用地、铁路用地、公路用地、机场用地、港口码头用地、管道运输用地、水工建筑用地、其他草地、沙地、裸地、盐碱地、冰川及永久积雪	0.12
内部条件	斑块密度	<10.98	10.98~17.50	17.50~23.29	23.29~31.30	≥31.30	0.07	0.47
	景观散布与并列指数	<38.62	38.62~45.73	45.73~52.57	52.57~61.38	≥61.38	0.06
	景观蔓延度指数	≥74.25	65.56~74.25	60.94~65.56	54.84~60.94	<54.84	0.13
	景观丰度	≥10	8.00~10.00	7.00~8.00	6.00~7.00	<6.00	0.09
	景观均匀度指数	≥0.69	0.60~0.69	0.53~0.60	0.41~0.53	<0.41	0.12

生态廊道级别	编号	廊道长度/km	位置
二级廊道	1	6.74	尔林兔镇
	2	11.16	锦界镇、麻家塔办事处交界
	3	10.09	高家堡镇、大保当镇交界
	4	9.59	高家堡镇
	5	7.39	太和寨、花石崖镇交界
	6	6.59	栏杆堡镇
	8	8.04	店塔镇
	10	7.87	大柳塔镇
三级廊道	7	4.69	麻家塔办事处、神木镇交界
三级廊道	9	4.53	孙家岔镇、大柳塔镇交界

Identification and optimization of ecological corridors in Shenmu City based on landscape ecological security

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