Evolution and driving mechanisms of eco-environmental quality across different urbanization stages.

time series; If \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\uptheta$$\end{document} < 0, it implies a decreasing trend with time series, and the spatial change trend of RSEI in the BTHSH region can be analyzed accordingly.

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13 ), it can be observed that from 1985 to 2020, the area of RSEI with sen > 0 accounted for 46.51% in the BTHSH region, suggesting that the eco-environment in this region demonstrated a favorable trend over the time series, and the area with sen < 0 accounted for 53.88%.

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In the BTSHS regions from 1985 to 2020, the proportions of the areas with a moderate level of eco-environment assessment and those with good and excellent levels demonstrated a decreasing tendency from 90.44% to 83.06%, while the area with poor and fair levels demonstrated an increasing trend from 9.56% to 16.94%.

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13 ), the eco-environment of the ecological conservation area in the northwest of Beijing–Tianjin–Hebei demonstrated a distinct tendency of improvement, while the eco-environment quality of the eastern coastal development area presented an obvious trend of deterioration.

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