银川市景观生态风险评价与生态安全格局优化构建

doi:10.12118/j.issn.1000-6060.2022.021

Abstract

Abstract:

The ecological environmental protection and high-quality development of Yinchuan City have become important parts of sustainable development in the Yellow River Basin, and the regional ecological security pattern must urgently be optimized. This study draws attention to the spatial and temporal characteristics of landscape ecological risk and constructs an ecological security pattern of Yinchuan City in the Ningxia Hui Autonomous Region, China, by employing land use data from 2000, 2010, and 2020; analyzing the spatial and temporal variation characteristics of landscape ecological risk based on landscape ecological risk assessment; and studying the ecological risk evolution rule of different land use. This study proposes the ecological security pattern and ecological security protection strategies using the landscape ecological risk index (ERI) and the minimal cumulative resistance (MCR) model. Meanwhile, in order to reflect the magnitude of resistance encountered during species migration, the paper used core ecological sources which had areas greater than 10 km² and were mainly distributed in natural protected areas such as Helan Mountain and Baijitan National Nature Reserve. It chose six resistance factors, including landscape ERI, vegetation coverage, elevation, slope, distance from road, and distance from water to calculate the resistance value. Based on ecological sources and resistance, the minimal cumulative resistance value was obtained by MCR and the ecological corridors and ecological nodes were identified preliminarily. Finally, the preliminary ecological security pattern was optimized, combined with land use map of 2020 and the MCR value, and the ecological security strategies were proposed. The results show that: (1) Landscape ecological risk in Yinchuan City shows the distribution characteristics, are high in which the middle and north but low in the south is low. The average ERIs of 2000, 2010, and 2020 are 0.2155, 0.2145, and 0.2130, respectively, which indicates an overall downward trend in the landscape ecological risk has appeared in the past 20 years and an ecological risk level moving from high to low. (2) Twenty-two ecological corridors and 52 ecological nodes are identified. The cumulative length of the ecological corridors is 511.23 km and shows the net distribution in the northwest-southeast direction, which is sparse in the north and dense in the south. Six key ecological corridors are through the north and south. These are distributed along the region that includes the Helan Mountain National Nature Reserve and the Yellow River-Baijitan National Nature Reserve, and form the spatial distribution characteristics of “three vertical”. (3) Yinchuan City has formed an optimized ecological security pattern, which consisted of 819.56 km² ecological sources, 22 ecological corridors, and 52 ecological nodes, and some ecological security protection strategies are proposed on the basis of ecological security pattern, which provides theoretical reference and a basis for landscape ecological risk assessment and promotion of the ecological security level.

Key words: landscape ecological risk, ecological security pattern, minimal cumulative resistance model, Yinchuan City

ZHANG Xiaodong,ZHAO Zhipeng,ZHAO Yinxin,GAO Xuehua,MA Yuxue,LIU Naijing,JI Weibo. Landscape ecological risk assessment and ecological security pattern optimization construction in Yinchuan City[J].Arid Land Geography, 2022, 45(5): 1626-1636.

Figures/Tables 8

Tab. 1

Fig. 1

Tab. 2

Fig. 2

Tab. 3

Tab. 4

Fig. 3

Fig. 4

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数据类型	数据来源	数据说明
土地利用数据	中国科学院资源环境科学数据中心	空间分辨率为30 m,其土地利用一级类型综合评价精度可达到90%以上^[27]。土地利用类型主要依据全国《土地利用现状分类》（GB/T 2010—2017）,并结合研究区生态环境现状将其分为耕地、林地、草地、水域、建设用地及未利用地6类,用于银川市景观生态风险评价。
Landsat 8遥感影像	地理空间数据云	获取植被覆盖度,构造阻力面
数字高程模型（DEM）	地理空间数据云	构建阻力面
社会经济数据	银川市统计年鉴与《全国重要生态系统保护和修复重大工程总体规划(2021—2035)》^[28]	参考资料

土地利用类型	年份	NP	C_i	N_i	K_i	S_i	F_i	R_i
耕地	2000	216	0.0009	0.0255	0.1819	0.0445	0.1905	0.0085
	2010	205	0.0009	0.0266	0.1704	0.0425	0.1905	0.0081
	2020	192	0.0009	0.0257	0.1682	0.0418	0.1905	0.0080
林地	2000	267	0.0058	0.1488	0.0803	0.0636	0.1429	0.0091
	2010	277	0.0055	0.1388	0.0847	0.0614	0.1429	0.0088
	2020	285	0.0060	0.1484	0.0849	0.0645	0.1429	0.0092
草地	2000	445	0.0019	0.0381	0.2228	0.0569	0.0952	0.0054
	2010	471	0.0020	0.0392	0.2279	0.0584	0.0952	0.0056
	2020	555	0.0025	0.0449	0.2380	0.0623	0.0952	0.0059
水域	2000	397	0.0149	0.3114	0.0955	0.1200	0.2381	0.0286
	2010	451	0.0160	0.3147	0.1073	0.1239	0.2381	0.0295
	2020	437	0.0156	0.3115	0.1044	0.1221	0.2381	0.0291
建设用地	2000	1270	0.0549	0.6421	0.2698	0.2741	0.0476	0.0130
	2010	1200	0.0295	0.3548	0.2658	0.1743	0.0476	0.0083
	2020	1241	0.0184	0.2180	0.2894	0.1325	0.0476	0.0063
未利用土地	2000	376	0.0029	0.0631	0.1497	0.0503	0.2857	0.0144
	2010	436	0.0036	0.0719	0.1578	0.0549	0.2857	0.0157
	2020	447	0.0041	0.0812	0.1528	0.0570	0.2857	0.0163

2020年	2000年
2020年	低生态风险区	较低生态风险区	中生态风险区	较高生态风险区	高生态风险区
低生态风险区	28.21	3.34	0.00	0.00	0.00
较低生态风险区	60.44	44.99	20.51	9.86	0.00
中生态风险区	11.36	51.62	59.16	43.86	2.21
较高生态风险区	0.00	0.05	20.14	37.43	69.33
高生态风险区	0.00	0.00	0.20	8.84	28.47

阻力类型	阻力因子	等级/阻力值
景观生态	景观生态风险指数	低风险/1;较低风险/2;中风险/3;较高风险/4;高风险/5
景观生态	植被覆盖度	(0.4, 1.0]/1;(0.3, 0.4]/2;(0.2, 0.3]/3;(0.1, 0.2]/4;(0, 0.1]/5
地形坡度	高程/m	(1000, 1200]/1;(1200, 1500]/2;(1500, 1800]/3;(1800, 2400]/4;(2400, 3500]/5
地形坡度	坡度/(°)	(0, 2]/1;(2, 12]/2;(12, 26]/3;(26, 42]/4;(42, 66]/5
距离因子	距道路距离/m	(4000, 18000]/1;(3000, 4000]/2;(2000, 3000]/3;(1000, 2000]/4;(0, 1000]/5
距离因子	距水域距离/m	(0, 1000]/1;(1000, 2000]/2;(2000, 3000]/3;(3000, 4000]/4;(4000, 18000]/5

Landscape ecological risk assessment and ecological security pattern optimization construction in Yinchuan City

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