1990—2021年内蒙古遥感生态环境质量变化及趋势分析——以呼伦贝尔市陈巴尔虎旗为例

doi:10.13866/j.azr.2023.02.16

Abstract

Abstract:

The ecological civilization construction in Inner Mongolia, an important ecological barrier in northern China, is important for national ecological security, the stability of the border areas, and the sustainable economic and societal development of the minority areas. In this study, we extracted four key indices based on long-term satellite observations to describe the quality of the ecosystem. We constructed the remote sensing ecological index (RSEI) through principal component analysis. Furthermore, we adopted the Mann-Kendall (M-K) trend test for analyzing the changes in ecological quality in the Hulunbuir grassland of Inner Mongolia from 1990 to 2021. The RSEI can comprehensively reflect the quality of the ecological environment, and results revealed that the quality of grassland in Inner Mongolia has improved in the past 30 years, with an increasing trend of 0.0037 every year (P < 0.01; R² = 0.39). The significant increasing trend of RSEI and the improved ecological quality from 2012 to 2021 was further verified through the M-K trend significance test. A single factor cannot fully characterize regional ecological quality so, four factors i.e., greenness, dryness, humidity, and heat were included in RSEI. The space quality showed a gradual improvement from west to east, with lower RSEI for grassland in the west compared with that for forest and farming areas in the east. A similar trend for quality was observed with the variation of the vegetation coverage. This study enriched the assessment methods of grassland ecological quality in Inner Mongolia, which can provide an important reference for the ecological protection, restoration, utilization, and sustainable development of meadow steppe in Inner Mongolia.

Key words: Hulunbuir grassland, Chenbarhu Banner, RSEI, Landsat, spatiotemporal analysis

ZHANG Yusi, BAO Yuhai, HE Zhonghua. Detecting the change and trend of remote sensing ecological quality in Inner Mongolia from 1990-2021： A case study of Chenbarhu Banner of Hulunbuir City[J].Arid Zone Research, 2023, 40(2): 326-336.

Figures/Tables 13

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参数	1990年				2000年
参数	PC1	PC2	PC3	PC4	PC1	PC2	PC3	PC4
NDVI	0.660	-0.601	-0.437	-0.113	0.64	-0.593	-0.488	0.0204
LST	-0.352	-0.775	0.524	0.0357	-0.611	-0.778	0.142	-0.046
NDBSI	-0.588	-0.135	-0.555	-0.573	-0.432	0.205	-0.827	-0.295
WET	0.308	0.145	0.476	-0.811	0.177	-0.039	0.239	-0.954
特征值	0.0201	0.007	0.0028	0.0008	0.0335	0.0112	0.0036	0.0005
特征值贡献率/%	65.50	22.85	9.12	2.52	68.51	22.99	7.41	1.09
参数	2010年				2020年
参数	PC1	PC2	PC3	PC4	PC1	PC2	PC3	PC4
NDVI	0.764	0.517	0.384	-0.0401	0.549	-0.692	-0.468	0.0231
LST	-0.477	0.855	-0.203	0.00253	-0.331	-0.695	0.639	-0.015
NDBSI	-0.302	-0.0324	0.563	-0.703	-0.732	-0.190	-0.593	-0.277
WET	0.313	0.00985	-0.768	-0.639	0.229	0.0488	0.15	-0.961
特征值	0.0309	0.0197	0.00239	0.000525	0.0331	0.0071	0.0035	0.0004
特征值贡献率/%	57.77	36.78	4.47	0.98	75.05	16.05	7.95	0.95

参数	1990年				2000年
参数	最大值	最小值	平均值	标准差	最大值	最小值	平均值	标准差
RSEI	0.992	0.0186	0.463	0.164	0.992	0.0240	0.412	0.132
NDVI	0.957	-0.597	0.610	0.109	0.973	-0.465	0.559	0.136
LST	32.248	3.942	19.578	2.402	46.605	10.466	27.241	4.648
NDBSI	1.600	-3.228	-0.0694	0.0978	0.632	-0.731	0.0414	0.104
WET	0.923	-0.820	0.627	0.056	1.0044	-1.122	0.772	0.0419
参数	2010年				2020年
参数	最大值	最小值	平均值	标准差	最大值	最小值	平均值	标准差
RSEI	0.968	0.00632	0.481	0.179	0.994	0.00232	0.523	0.131
NDVI	0.998	-0.696	0.552	0.160	1	-0.498	0.705	0.131
LST	45.501	8.182	29.215	5.20	50.687	-19.225	37.574	6.424
NDBSI	1.788	-11.760	0.0652	0.126	0.291	-0.729	-0.0371	0.132
WET	0.99	-0.894	0.6005	0.0666	0.793	-0.227	0.283	0.0471

	1990年
	草地		建筑	裸地	农田	森林	湿地	水体	总计
2020年	草地	13993.36	0.057	11.00231	177.971	15.939	24.170	19.0455	14241.55
2020年	建筑	29.073	2.17694	0.213	2.649	0.367	0.254	4.0404	38.774
	裸地	48.155	0.00293	10.215	0.545	0	0.0351	0.902	59.854
	农田	550.467	0	0.0164	440.137	34.674	2.950	2.358	1030.604
	森林	590.342	0.0105	0.0240	36.940	1301.938	6.00475	15.216	1950.475
	湿地	0.114	0	0	0.0998	0.00704	1.188	0.0382	1.446
	水体	17.476	0.109	0.127	3.598	0.0892	1.921	67.497	90.817
	总计	15228.99	2.357	21.598	661.939	1353.014	36.522	109.096	17413.52

Detecting the change and trend of remote sensing ecological quality in Inner Mongolia from 1990-2021： A case study of Chenbarhu Banner of Hulunbuir City

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