Zhao et al. (2025) Climate Surpasses Soil Texture in Driving Soil Salinization Alleviation in Arid Xinjiang

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Identification

• Journal: Remote Sensing
• Year: 2025
• Date: 2025-11-25
• Authors: Jiahao Zhao, Hongqi Wu, Haibin Gu, Yanmin Fan, Zhiwen Zhao, Pengfei Wang, Changlei Li
• DOI: 10.3390/rs17233812

Research Groups

[Information not explicitly provided in the paper text.]

Short Summary

This study quantitatively assessed the spatiotemporal variations of soil salinization in southern Xinjiang from 2008 to 2023, revealing a significant overall decrease in salinity, and found that climatic factors consistently exerted a stronger influence on its evolution than soil texture.

Objective

• To explore the spatiotemporal variations in soil salinization in arid regions and its responses to climate and soil texture, providing a systematic quantitative assessment of their mechanisms and relative contributions.

Study Configuration

• Spatial Scale: Southern Xinjiang, an arid region.
• Temporal Scale: 15 years, with four equidistant time points: 2008, 2013, 2018, and 2023.

Methodology and Data

• Models used: Random Forest (RF) for soil salinity inversion, Boosted Regression Tree (BRT) for quantifying driving contributions, Sen’s slope−Mann−Kendall test for trend analysis.
• Data sources: Salinity sampling sites (ground truth) collected in 2023, spectral indices derived from Landsat-9 and Sentinel-2 satellites, climatic variables (potential evapotranspiration, temperature, precipitation), and soil texture variables.

Main Results

• The feature-selected Random Forest model based on Landsat-9 data showed the best performance for soil salinity inversion, achieving an R² of 0.747.
• The mean soil salinity concentration in the study area declined rapidly from 2008 to 2013, followed by a relatively slower but sustained decrease until 2023.
• The proportion of non-salinized land significantly increased from 3.08% in 2008 to 30.81% in 2023.
• Trend analysis indicated that 78.6% of salinity levels exhibited a significant downward trend, while 18.8% showed a slight increase.
• Relative contribution analysis revealed that climatic factors consistently exerted a stronger influence on the evolution of soil salinization than soil texture.
• The contribution of climatic variables increased from 65.2% in 2008 to 66.8% in 2023, whereas that of soil texture decreased slightly from 34.8% to 33.2%.
• Among climatic variables, the effect of potential evapotranspiration gradually weakened, while the impacts of temperature and precipitation continued to intensify. Soil texture variables played a comparatively minor yet stable role.

Contributions

• Provides a systematic quantitative assessment of the mechanisms by which climate and soil texture shape long-term soil salinity dynamics in arid regions.
• Offers a comparative evaluation of the relative contributions of climatic factors and soil texture to soil salinization.
• Establishes an effective framework for long-term monitoring of soil salinization using remote sensing and machine learning techniques.
• Delivers critical insights for adaptive management strategies in arid regions facing climate change and soil salinization challenges.

Funding

[Information not explicitly provided in the paper text.]

Citation

@article{Zhao2025Climate,
  author = {Zhao, Jiahao and Wu, Hongqi and Gu, Haibin and Fan, Yanmin and Zhao, Zhiwen and Wang, Pengfei and Li, Changlei},
  title = {Climate Surpasses Soil Texture in Driving Soil Salinization Alleviation in Arid Xinjiang},
  journal = {Remote Sensing},
  year = {2025},
  doi = {10.3390/rs17233812},
  url = {https://doi.org/10.3390/rs17233812}
}