乌鲁木齐市土地生态安全综合评价

doi:10.12118/j.issn.1000–6060.2021.02.14

Abstract

Abstract:

For this study, we select the city of Urumqi, which is located in an arid region of China, as the research area and take 2017 as the time node. Then, we select 20 indicators in three aspects of nature, society, and economy to comprehensively characterize the level of LES in Urumqi. Combined with ecosystem services and landscape perspectives, spatial characteristics are described. The results show the following: (1) In 2017, the ESV in Urumqi was 22.07 billion yuan and 97.48% of its area was in the low-to-medium ESV domain. The most important source of ESV contribution were forest-grasslands, and the main contributing area was Urumqi County and Dabancheng District. Obvious differences were observed in the regional ESVs. (2) Urumqi has urban landscape characteristics that are typical of arid areas, and the overall distribution of its landscape is relatively coordinated. However, the landscape distribution having ecological advantages is currently small. The LES is spatially expressed as “west low and east high”, and the overall level is relatively low. Meanwhile, the LESs in various regions exhibit certain classification features. High-value areas are concentrated in edge areas such as Dabancheng District, Urumqi County, and Midong District. In the marginal areas, the LES in the central urban area is generally poor and is deeply affected by human activities. (3) The land ecological security of the various regions of Urumqi City is mainly distributed between the sensitive and relative security levels. Overall ecological security of the city is at a medium level; the edge areas generally exhibited a higher level of ecological security than that exhibited by the central areas. Urumqi County has the highest land ecological security level in the edge area, and high-tech zones have the highest level of land ecological security. With urban expansion and population growth, land encroachment and resource consumption and other similar parameters have intensified. Moreover, the land ecological security in some regions has been destroyed to a certain extent; and it can maintain the current level mainly relying on the natural background (state) of each region in Urumqi. The adverse effects (stress) and positive improvement (response) of human activities are not yet obvious. At present, there is much room for improving the level of land ecological security in Urumqi. Areas with low levels of land ecological security are still concentrated in areas with frequent human activities. Unused land occupies a large proportion in the study area. The desertification situation of Urumqi is still very serious. Forest-grasslands and land covered by water are important to maintain the ecological safety of the land in this area. However, the landscape conditions are relatively poor. In the future, we must pay attention to the land use and environmental protection planning in the study area, especially the protection of forest-grassland and land covered by water. Simultaneously, to avoid the continued deterioration of the land ecological security level, a long-term dynamic monitoring mechanism for the land ecological environment should be established to strengthen the control of land development.

Key words: PSR model, ecosystem service value, landscape ecological security, land ecological security assessment, Urumqi City

WANG Yishan,ZHANG Fei,CHEN Rui,QI Yaxiao,LIU Changjiang. Comprehensive ecological security assessment: A case study of Urumqi City[J].Arid Land Geography, 2021, 44(2): 427-440.

Figures/Tables 12

Fig. 1

Tab. 1

Types and sources of data"

数据类型	时间	数据精度	数据来源	用途
土地利用类型	2017年7月	30 m×30 m	Landsat 8 OLI影像;地理空间数据云平台(http://www.gscloud.cn)和Google Earth影像的人工目视解译成果	生态系统服务价值（ESV）、景观格局分析基础数据
数字高程数据	2017年	30 m×30 m	地理空间数据云平台(http://www.gscloud.cn)	高程、坡度计算
中国年度植被覆盖数据	2017年	250 m×250 m	中国科学院资源环境科学数据中心	评价指标核算
气象数据	2017年	-	中国气象科学数据共享服务网中国地面气候资料数据集（包含降雨量、气温、蒸散发等）来源于中国气象科学数据共享服务网（http://data.cma.cn/）	评价指标核算
土壤数据	第二次全国土地调查	1 $∶$ 1000000	全球土壤属性数据库中的中国土壤数据集来源于“黑河计划数据管理中心”(http://westdc.westgis.ac.cn)	评价指标核算
水系、交通路网数据	2017年7月	-	公开街道地图（https://www.openstreetmap.org）	评价指标核算
人口、经济等数据	2017年	-	《2017年乌鲁木齐市统计年鉴》	评价指标核算

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Fig. 2

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Tab. 8

Fig. 3

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服务类型		建设用地	水体	耕地	林草地	裸地
一级类型	二级类型	建设用地	水体	耕地	林草地	裸地
调节服务	气体调节	0.00	1538.54	1185.54	2877.25	0.00
	气候调节	0.00	4575.63	619.41	8152.21	0.00
	水文调节	0.00	299907.30	2923.59	7167.20	0.00
	净化环境	151.02	11089.40	179.83	2470.97	15.31
支持服务	土壤保持	0.00	162.89	60.72	307.08	30.80
	生物多样性保护	0.00	5095.13	226.55	3183.63	523.39
	营养物循环	0.00	139.86	206.47	266.41	0.00
供给服务	食物供应	143.73	1598.48	1471.93	459.56	15.31
	原材料	0.00	459.56	326.36	845.86	0.00
	水资源供给	452.91	24317.61	-2552.03	664.90	46.11
文化服务	娱乐文化	143.73	3776.39	99.91	1398.57	15.31
	总计	891.39	352660.80	4748.25	27793.64	646.24

目标层	准则层	要素层	指标层	指标来源	指标权重	标准值		标准来源	指标方向
目标层	准则层	要素层		指标来源	指标权重	安全值	不安全值	标准来源	指标方向
	压力	社会压力		人口密度/人·hm^-2	统计年鉴	0.023	-	-	极差标准化	-
乌鲁木齐市土地生态安全	压力			自然增长率/%	统计年鉴	0.027	-	-	极差标准化	-
	经济密度/10⁸元·km^-2		统计年鉴	0.051	-	-	极差标准化	+
	资源压力		人均水资源量/m³·人^-1	统计年鉴	0.075	-	1000	国家标准	+
	资源压力	人均耕地面积 /hm²·人^-1	统计年鉴	0.081	0.08	0.02	国家标准	+
	状态	地形条件	坡度/°	DEM数据	0.069	-	-	极差标准化	-
		植被条件	NDVI	专题数据	0.033	-	-	极差标准化	+
		植被条件	森林覆盖率/%	专题数据	0.037	-	-	极差标准化	+
		水文条件	水网密度/km·km^-2	专题数据	0.024	-	-	极差标准化	+
		土壤条件	土壤质地	专题数据	0.019	-	-	极差标准化	+
		景观条件	LES	遥感数据	0.054	-	-	极差标准化	+
		降水	年均降水/mm	气象数据	0.061	800	-	国家标准	+
	响应	自然响应	ESV/10⁸元	遥感数据	0.074	-	-	极差标准化	+
		人文响应	耕地面积比重/%	遥感数据	0.052	-	-	极差标准化	-
			耕地灌溉比率/%	统计年鉴	0.085	-	-	评分后赋值	+
			路网密度/km·km^-2	专题数据	0.046	-	-	极差标准化	+
			人均GDP/10⁴元	统计年鉴	0.054	2.5	0.5	国家标准	+
		社会响应	第三产业比重/%	统计年鉴	0.034	-	-	极差标准化	+
			城市化水平/%	统计年鉴	0.049	-	-	国家标准	+
			灯光密度	遥感数据	0.053	-	-	国家标准	+

ESI指数	安全等级	安全状态	状态说明
0.00≤ESI≤0.20	Ⅰ	危险级	区域土地生态安全已破坏到难以恢复状态,生态环境不完整,功能缺失,难以满足生态系统发展需要。
0.20<ESI≤0.35	Ⅱ	敏感级	区域生态安全已遭到严重破坏,生态敏感性强,生态功能退化严重,生态压力较大。
0.35<ESI≤0.45	Ⅲ	临界安全级	生态安全受到一定影响,生态结构完整但存在一定生态异常现象,有一定生态压力。
0.45<ESI≤0.75	Ⅳ	相对安全级	区域土地生态安全受自然及人类活动影响轻微,生态结构较为合理,整体生态系统较为健康,有轻微生态压力。
0.75<ESI≤1.00	Ⅴ	安全级	区域土地生态安全几乎未受影响,整体生态功能完善,生态结构完整,适宜区域生态系统可持续发展,无生态压力。

服务类型	合计	天山区	沙依巴克区	高新区	水磨沟区	头屯河区	米东区	达坂城区	乌鲁木齐县
调节服务	175.08	4.23	2.79	3.79	3.09	23.60	3.51	62.85	71.21
支持服务	22.39	0.31	0.31	0.67	0.49	3.40	0.37	6.63	10.21
供给服务	15.87	0.36	0.18	0.36	0.32	2.16	0.31	5.67	6.50
文化服务	7.36	0.12	0.12	0.24	0.16	0.88	0.15	2.05	3.63
合计	220.70	5.03	3.40	5.06	4.07	30.06	4.34	77.20	91.54

土地利用类型	CA/hm²	NP	LPI/%	LSI	ENN_MN	IJL	SPLIT	AI
裸地	778378.86	21237.00	27.03	104.85	124.20	57.12	10.31	96.47
建设用地	76228.74	21599.00	0.76	167.08	157.01	77.72	10677.22	81.93
水域	25889.76	4267.00	0.32	57.62	275.53	83.11	64886.64	89.42
林草地	436582.53	27098.00	16.85	170.34	111.95	74.75	32.29	92.31
耕地	58977.45	14435.00	0.48	119.61	180.66	51.67	25097.90	85.32

Comprehensive ecological security assessment: A case study of Urumqi City

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地区	NP	PAFRAC	CONTAG	IJL	COHESION	SPLIT	SHEI	SHDI
乌鲁木齐市	88636.00	1.35	58.45	69.81	99.79	7.81	0.66	1.06
达坂城区	24672.00	1.34	67.08	52.26	99.85	2.68	0.81	0.50
高新区	5584.00	1.37	38.36	68.58	98.19	23.92	1.36	0.84
米东区	18567.00	1.36	65.99	76.19	99.47	2.64	0.88	0.55
水磨沟区	3636.00	1.36	53.73	69.43	99.06	5.57	1.06	0.66
沙依巴克区	5635.00	1.37	46.62	70.13	98.67	12.71	1.24	0.77
天山区	2752.00	1.34	42.24	73.22	98.75	9.88	1.34	0.84
头屯河区	4622.00	1.35	40.15	75.54	98.21	26.15	1.38	0.86
乌鲁木齐县	24361.00	1.33	62.01	63.15	99.87	3.09	0.97	0.60

地区	景观干扰度指数	景观脆弱度指数	LES指数
达坂城区	1.63	0.39	0.69
米东区	1.40	0.28	0.48
沙依巴克区	0.30	0.03	0.22
水磨沟区	0.32	0.01	0.16
天山区	0.31	0.01	0.11
头屯河区	1.03	0.02	0.20
乌鲁木齐县	1.40	0.25	0.59
高新区	1.01	0.01	0.12

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