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Lanhui Wang

Forskare

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Mapping soil cadmium content using multi-spectral satellite images and multiple-residual-stacking model : Incorporating information from homologous pollution and spectrally active materials

Författare

  • Chao Tan
  • Haijun Luan
  • Qiuhua He
  • Yaling Zheng
  • Zhenhong Lin
  • Lanhui Wang

Summary, in English

Soil cadmium (Cd) contamination significantly threatens ecosystems and human health. Traditional geochemical investigation, although accurate, is impractical for wide-area and frequent monitoring applications. Multi-spectral satellite images combined with the homologous pollution information (HPI) and the spectral and content information of soil organic matter (SOMSCI) is an unconventional and promising approach for large-scale, dynamic soil heavy metal (SHM) monitoring. Based on a novel Multiple-Residual-Stacked (MRS) machine-learning framework, the study estimated the soil Cd content in Yueyang City, China, during the past decade (2014–2023) using Landsat 8 images. Within it, three feature construction methods and four models were employed. The experimental results indicate that the XGB-MRS model incorporating HPI and SOMSCI significantly improved the estimation performance (RPD exceeded 90 %, R2, RMSE, and MAE exceeded 40 %). Moreover, against 243 ground samples during 2016–2022, the average overall estimation accuracy exceeded 80 %, validating the model's robustness and practicality. Furthermore, the descending order of contribution in the modelling is environmental auxiliary variables (55 %), HPI and SOMSCI (26 %), and spectral information (19 %). The fertilizer usage has direct (up to 2 years) and delayed (3–5 years) effects on soil Cd accumulation. Overall, our study provides a scalable framework for monitoring global SHM pollution using open-source multi-spectral satellite data.

Avdelning/ar

  • Institutionen för naturgeografi och ekosystemvetenskap

Publiceringsår

2025

Språk

Engelska

Publikation/Tidskrift/Serie

Journal of Hazardous Materials

Volym

485

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Environmental Sciences and Nature Conservation (including Biodiversity)

Nyckelord

  • Homologous pollution
  • Landsat 8
  • Multiple-Residual-Stacking
  • Soil cadmium
  • Spectrally active materials

Aktiv

Published

ISBN/ISSN/Övrigt

  • ISSN: 0304-3894