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Development of a large-scale remote sensing ecological index in arid areas and its application in the Aral Sea Basin

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Abstract

The Aral Sea Basin in Central Asia is an important geographical environment unit in the center of Eurasia. It is of great significance to the ecological protection and sustainable development of Central Asia to carry out dynamic monitoring and effective evaluation of the eco-environmental quality of the Aral Sea Basin. In this study, the arid remote sensing ecological index (ARSEI) for large-scale arid areas was developed, which coupled the information of the greenness index, the salinity index, the humidity index, the heat index, and the land degradation index of arid areas. The ARSEI was used to monitor and evaluate the eco-environmental quality of the Aral Sea Basin from 2000 to 2019. The results show that the greenness index, the humidity index and the land degradation index had a positive impact on the quality of the ecological environment in the Aral Sea Basin, while the salinity index and the heat index exerted a negative impact on the quality of the ecological environment. The eco-environmental quality of the Aral Sea Basin demonstrated a trend of initial improvement, followed by deterioration, and finally further improvement. The spatial variation of these changes was significant. From 2000 to 2019, grassland and wasteland (saline alkali land and sandy land) in the central and western parts of the basin had the worst ecological environment quality. The areas with poor ecological environment quality are mainly distributed in rivers, wetlands, and cultivated land around lakes. During the period from 2000 to 2019, except for the surrounding areas of the Aral Sea, the ecological environment quality in other areas of the Aral Sea Basin has been improved in general. The correlation coefficients between the change in the eco-environmental quality and the heat index and between the change in the eco-environmental quality and the humidity index were −0.593 and 0.524, respectively. Climate conditions and human activities have led to different combinations of heat and humidity changes in the eco-environmental quality of the Aral Sea Basin. However, human activities had a greater impact. The ARSEI can quantitatively and intuitively reflect the scale and causes of large-scale and long-time period changes of the eco-environmental quality in arid areas; it is very suitable for the study of the eco-environmental quality in arid areas.

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Acknowledgements

This work was funded by the National Natural Science Foundation of China (U1603242) and the Major Science and Technology Projects in Inner Mongolia, China (ZDZX2018054). The data used in this study were obtained from the NASA (https://ladsweb.modaps.eosdis.nasa.gov/) and the National Tibetan Plateau Data Center (https://data.tpdc.ac.cn/zh-hans/). We also wish to thank the three anonymous reviewers for their helpful comments to improve the manuscript.

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Wang, J., Liu, D., Ma, J. et al. Development of a large-scale remote sensing ecological index in arid areas and its application in the Aral Sea Basin. J. Arid Land 13, 40–55 (2021). https://doi.org/10.1007/s40333-021-0052-y

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