Identifying Key Factors Associated with Green Justice in Accessibility: A Gradient Boosting Decision Tree Analysis

Sainan Du, Huagui He, Yanfang Liu and Lijun Xing ()
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Sainan Du: Faculty of Resources and Environmental Science, Hubei University, 368 Youyi Road, Wuhan 430062, China
Huagui He: Guangzhou Urban Planning and Design Survey Research Institute, Guangzhou 510060, China
Yanfang Liu: School of Resource and Environment Science, Wuhan University, 129 Luoyu Road, Wuhan 430079, China
Lijun Xing: Faculty of Resources and Environmental Science, Hubei University, 368 Youyi Road, Wuhan 430062, China

IJERPH, 2022, vol. 19, issue 16, 1-17

Abstract: Park green space (PGS) provides numerous environmental and health benefits for urban residents, and raises the issue of green justice for its uneven distribution in cities. Previous studies focus more on the measurements of spatial equity in accessibility, but are limited in exploring its impacts—especially the nonlinear influence. This study first measures accessibility and equity in two traffic modes, and then explores the nonlinear influence of multidimensional factors by using the gradient boosting decision tree (GBDT) model across the central urban area of Wuhan. The results show significant spatial disparities in spatial accessibility and equity by walking and driving within 15 min. Multidimensional factors—including characteristics of PGS, the built environment, and socioeconomic factors—present stronger nonlinear influences on spatial accessibility and equity, and the nonlinear influence indicates that the contributions of the built environment and socioeconomic factors are greater than those of park characteristics, accounting for at least 79.76%. The key variables affecting the accessibility and equity are not completely consistent, leading to synergistic and heterogeneous effects, which may provide policy implications for streets where accessibility and equity are mismatched. These findings could provide guidance for PGS planning by decision-makers to improve the living environment and urban health.

Keywords: park green space (PGS); green justice; accessibility and equity; gradient boosting decision tree (GBDT); nonlinear influence; Wuhan (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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