基于MODIS的2006-2016年西藏生态质量综合评价及其时空变化

doi:10.11821/dlxb201907012

Abstract

Abstract:

In view of the lack of research on the screening and comprehensive evaluation of vegetation ecological parameters based on remotely sensed date products, this paper firstly proposes a method to evaluate the vegetation eco-environmental quality in Tibet by PCA (principal component analysis). Based on five indicators, including fractional vegetation coverage (FVC), leaf area index (LAI), gross primary productivity (GPP), land surface temperature (LST) and modified wet (Wet) from MODIS satellite data, the law and mechanism of spatial-temporal changes of eco-environmental quality in Tibet in the last 10 years are explored. The experimental results show that: (1) The comprehensive quality of the eco-environmental quality in Tibet is relatively fragile, and the spatial difference in eco-environmental quality is significant. It is excellent in the southeast but poor in the northwest. (2) During the period from 2006 to 2016, the eco-environmental quality in Tibet shows a trend of improving overall. In terms of time series, the proportion of areas improved and degraded in the past 10 years was 31.88% and 4.13% respectively. In terms of spatial distribution, the improved areas are distributed in the northwestwen, central and eastern parts, but but the degraded areas are distributed in the southeastern parts. (3) Improvements in hydrothermal conditions (especially the increase in precipitation) and human protection policies have led to improvements in the eco-environmental quality in the western and central Tibet. The strengthening of social and economic activities is the main reason for the deterioration of the eco-environmental quality in the southeast of Tibet.

Key words: Tibet, MODIS date products, eco-environmental quality, principal component analysis, spatial-temporal changes

WU Yijin,ZHAO Xingshuang,XI Yue,LIU Hui,LI Chang. Comprehensive evaluation and spatial-temporal changes of eco-environmental quality based on MODIS in Tibet during 2006-2016[J].Acta Geographica Sinica, 2019, 74(7): 1438-1449.

Figures/Tables 11

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指标	产品	时间分辨率(d)	空间分辨率(m)	等级
FVC	MOD13A2 (归一化植被指数)	16	1000	L3
LAI	MOD15A2H	8	500	L4
GPP	MOD17A2H	8	500	L4
LST	MOD11A2	8	1000	L3
Wet	MOD09A1 (地表反射率)	8	500	L3

指标	2006年		2016年
指标	PC1	PC2	PC1	PC2
FVC	0.932	0.001	0.880	0.051
LAI	0.954	0.028	0.912	0.927
GPP	0.981	0.011	0.924	0.938
LST	0.349	-0.758	0.219	0.154
Wet	0.281	0.802	0.478	0.494
特征值	2.941	1.219	2.782	1.227
方差贡献率(%)	58.822	24.384	55.638	24.528
累计贡献率(%)	58.822	83.206	55.638	80.165

生态综合指数等级	2006年		2016
生态综合指数等级	面积(km²)	百分比(%)	面积(km²)	百分比(%)
差(0.0~0.2)	536545	57.63	319410	35.45
较差(0.2~0.4)	251186	26.98	379048	42.07
中等(0.4~0.6)	105307	11.31	161781	17.96
良(0.6~0.8)	30960	3.33	35122	3.90
优(0.8~1.0)	7051	0.76	5567	0.62

类别	类别	面积(km²)	级别百分比(%)	类别百分比(%)
变差	明显变差(-2)	947	0.11	4.13
变差	变差 (-1)	35939	4.03	4.13
不变	不变 (0)	571302	63.99	63.99
变好	变好 (+1)	284112	31.82	31.88
变好	明显变好(+2)	470	0.05	31.88

Comprehensive evaluation and spatial-temporal changes of eco-environmental quality based on MODIS in Tibet during 2006-2016

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