基于改进型遥感生态指数的塔里木河干流生态环境质量评价

doi:10.12118/j.issn.1000-6060.2024.286

Abstract

Abstract:

The mainstream area of the Tarim River is a crucial ecological barrier in northwest China’s arid region. As a key beneficiary of ecological water transfer, studying changes in its ecological environment quality is vital for assessing the impact of these projects. Using Landsat remote sensing data from 1998 to 2022, an improved remote sensing ecological index (RSEIS) was developed by combining five indicators: greenness (NDVI), humidity (WET), dryness (NDBSI), heat (LST), and salinity (SI_T). The trends and stability of the ecological environment quality were analyzed using the Mann-Kendall test, Theil-Sen median trend analysis, Hurst exponent, and coefficient of variation. A geographic detector analyzed the influence of various driving factors on RSEIS. The results showed the following: (1) From 1998 to 2022, the overall ecological environment quality in the mainstream area of the Tarim River showed a fluctuating upward trend, with an average annual increase of 0.023·(10a)^-1. The spatial distribution of the multiyear average RSEIS showed lower values in the south and east and higher values in the north and west. (2) Over 25 years, 55.06% of the basin area saw improvements in ecological environment quality, although 54.59% of the area remains at risk of ecological degradation. (3) Causality analysis revealed that land use type (0.534) had the strongest explanatory power for RSEIS spatial variation, and the interaction between land use type and potential evapotranspiration (0.659) was identified as the key driver of ecological environment quality in the study area. This study can provide scientific references for the sustainable development of the ecological environment quality of the Tarim River mainstream.

Key words: improved remote sensing ecological index, ecological environment quality, geodetector, the mainstream of Tarim River

LIU Wei, LING Hongbo, GONG Yanming, CHEN Fulong, SHAN Qianjuan. Evaluation of ecological environment quality in the mainstream of Tarim River based on improved remote sensing ecological index[J].Arid Land Geography, 2025, 48(2): 271-282.

Figures/Tables 9

Fig. 1

Tab. 1

Calculation methods for each indicator"

成分	指标	公式	备注
绿度	NDVI	$N D V I = (ρ N I R - ρ R) / (ρ N I R + ρ R)$	NDVI为归一化植被指数； $ρ N I R$ 和 $ρ R$ 分别为Landsat的近红外波段和红波段的反射率
湿度	WET	$W E T T M = 0.0315 ρ B + 0.2021 ρ G + 0.3102 ρ R + 0.1594 ρ N I R - 0.6806 ρ S W I R 1 - 0.6109 ρ S W I R 2$ $W E T E T M + = 0.2626 ρ B + 0.2141 ρ G + 0.0926 ρ R + 0.0656 ρ N I R - 0.7629 ρ S W I R 1 - 0.5388 ρ S W I R 2$ $W E T O L I = 0.1511 ρ B + 0.1973 ρ G + 0.3283 ρ R + 0.3407 ρ N I R - 0.7117 ρ S W I R 1 - 0.4559 ρ S W I R 2$	$W E T T M$ 、 $W E T E T M +$ 、 $W E T O L I$ 分别为Landsat5、Landsat7、Landsat8对应的湿度； $ρ B$ 、 $ρ G$ 、 $ρ S W I R 1$ 、 $ρ S W I R 2$ 分别为Landsat的蓝波段、绿波段、短波红外1波段和短波红外2波段的反射率
热度	LST	$L S T = 0.00341802 N D + 149 - 273.15$	LST为地表温度（℃）；ND为不同传感器的影像像元灰度值
干度	NDBSI	$N D B S I = S I = ρ S W I R 1 + ρ R - ρ N I R + ρ B ρ S W I R 1 + ρ R + ρ N I R + ρ B$	NDBSI为干度指数；SI为裸土指数
盐度	SI_T	$S I_T = (S I_1 + S I_2) / 2$ $S I_1 = ρ G 2 + ρ R 2$ $S I_2 = ρ B × ρ R$	SI_T、SI_1、SI_2为盐度指数

Tab. 1

Fig. 2

Fig. 3

Fig. 4

Tab. 2

Tab. 3

Fig. 5

Fig. 6

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变化趋势			变异系数			未来趋势
类型	面积/km²	占比/%	类型	面积/km²	占比/%	类型	面积/km²	占比/%
显著恶化	917.94	4.74	低波动	608.71	3.14	持续退化	95.34	0.49
轻微恶化	6358.72	32.85	相对低波动	10569.93	54.60	未来退化	10568.02	54.59
不变	1423.06	7.35	中等波动	6396.85	33.04	稳定不变	1348.17	6.97
轻微改善	8137.86	42.04	相对高波动	1345.66	6.96	未来改善	7196.16	37.17
显著改善	2521.33	13.02	高波动	437.75	2.26	持续改善	151.20	0.78

影响因子	1998年		2002年		2007年		2013年		2018年		2022年		均值
影响因子	q	P	q	P	q	P	q	P	q	P	q	P	q
DMSP	0.011	0	0.009	0	0.015	0	0.080	0	0.066	0	0.170	0	0.058
AS	0.003	0	0.003	0	0.002	0	0.002	0	0.002	0	0.002	0	0.003
SL	0.020	0	0.023	0	0.021	0	0.019	0	0.021	0	0.021	0	0.021
LUCC	0.508	0	0.455	0	0.575	0	0.559	0	0.551	0	0.555	0	0.534
TEMP	0.077	0	0.205	0	0.208	0	0.234	0	0.090	0	0.128	0	0.157
POP	0.113	0	0.014	0	0.017	0	0.055	0	0.013	0	0.041	0	0.042
PET	0.565	0	0.564	0	0.409	0	0.511	0	0.437	0	0.429	0	0.486
PRE	0.137	0	0.144	0	0.057	0	0.115	0	0.105	0	0.119	0	0.113

Evaluation of ecological environment quality in the mainstream of Tarim River based on improved remote sensing ecological index

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