Analysis of soil moisture content changes in resource-based cities over a long time series: a case study of Xilinhot city

doi:10.13474/j.cnki.11-2246.2021.0202

Abstract

Abstract: Large-scale coal mining activities have disturbed the ecological environment. Soil moisture content is important as one of the disturbed ecological parameters. Currently, existing soil moisture content products have coarse resolution and are not suitable for regional scale studies, while microwave inversion of soil moisture content with fine resolution are limited by the data so that can not be used for long time series studies. This paper takes Xilinhot, an important coal production base in China, as the study area, and uses AMSR-E, AMSR-2 soil moisture content products from 2004 to 2020 and Landsat remote sensing images for the same period as the main data sources. The random forest method is used to downscale the AMSR-E/2 soil moisture content products. The variation characteristics of soil moisture content in the study area are analyzed by standard deviation ellipse. And the results show that:① Passive microwave soil water moisture downscaling method enables long time series and high spatial resolution monitoring of soil moisture content in resource-based cities. ② Precipitation is the dominant factor affecting soil moisture content changes in both mining and non-mining areas. ③ The overall distribution of soil moisture content in the study area shows a gradual increase in spatial characteristics from northwest to southeast, and this distribution pattern remained stable over long time scales. ④ Coal mining activities disturb soil moisture content, and the impact of different mining stages has different characteristics. The results of the study provide a scientific basis for the evaluation and protection of the ecological environment of coal cities.

Key words: soil moisture content, downscale, random forest, long time series, resource-based city

CLC Number:

P237

LI Jun, SANG Xiao, ZHANG Chengye, ZHAO Wei, LIU Xinhua, WANG Hongpeng, WANG Jinyang, LI Jiayao, YANG Ying. Analysis of soil moisture content changes in resource-based cities over a long time series: a case study of Xilinhot city[J]. Bulletin of Surveying and Mapping, 2021, 0(7): 17-22,38.

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