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<p>IRS LISS III Resource SAT data (2018–2020) revealed large-scale distribution of salt-affected soils in the Gangetic plain of Uttar Pradesh state. High reflectance from salt encrustation from barren wastelands indicated the presence of strong sodicity (57%) in the Ganga-Yamuna divide (called <i>doab</i>). Mixed spectral signatures for waterlogging and saline-sodic soil were identified in the canal-irrigated areas. Prominent soil characteristics include high soil pH in sodic and high ECe in saline-sodic soils. Fine soil texture, nodular, and concretionary CaCO<sub>3</sub> (calcretes) at shallow depth and natric horizon at sub-surface depth have restricted salt movement, crop growth, and natural drainage in strongly sodic soils. Dominant salts such as Na<sub>2</sub>CO<sub>3</sub> and NaHCO<sub>3</sub> prompted an increase in soil alkalinity and a high exchangeable sodium percentage (ESP) in sodic soils. Mixed spectral properties of salt, moisture, and crop cover have restricted the delineation of moderate and slightly sodic soils using remote data only and were mapped integrating with ground truth data. Based on soil pH, Ece, and ESP values, three categories of sodic soils, such as slight, moderate, and strong, were identified. Sodic and saline-sodic soils covered 85.6% and 13.3% of the total areas (3,793,123 ha). Slightly sodic areas increased by 51.8%, and moderate and strongly saline-sodic soils decreased by 62% between 1996 and 2023. The moderate and strongly sodic areas (3,207,800 ha) also corroborated the earlier estimates for Uttar Pradesh state (Singh et al., 2004).</p>

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Spatial assessment, mapping, and characterization of salt-affected soils in Uttar Pradesh state of the Gangetic plain (IGP), India, for planning reclamation and management

  • 期刊论文

  • 发表日期：

    2025年6月7日

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  • A. K. Mandal,
  • S. Arora,
  • P. C. Sharma,
  • R. K. Yadav

摘要

IRS LISS III Resource SAT data (2018–2020) revealed large-scale distribution of salt-affected soils in the Gangetic plain of Uttar Pradesh state. High reflectance from salt encrustation from barren wastelands indicated the presence of strong sodicity (57%) in the Ganga-Yamuna divide (called doab). Mixed spectral signatures for waterlogging and saline-sodic soil were identified in the canal-irrigated areas. Prominent soil characteristics include high soil pH in sodic and high ECe in saline-sodic soils. Fine soil texture, nodular, and concretionary CaCO3 (calcretes) at shallow depth and natric horizon at sub-surface depth have restricted salt movement, crop growth, and natural drainage in strongly sodic soils. Dominant salts such as Na2CO3 and NaHCO3 prompted an increase in soil alkalinity and a high exchangeable sodium percentage (ESP) in sodic soils. Mixed spectral properties of salt, moisture, and crop cover have restricted the delineation of moderate and slightly sodic soils using remote data only and were mapped integrating with ground truth data. Based on soil pH, Ece, and ESP values, three categories of sodic soils, such as slight, moderate, and strong, were identified. Sodic and saline-sodic soils covered 85.6% and 13.3% of the total areas (3,793,123 ha). Slightly sodic areas increased by 51.8%, and moderate and strongly saline-sodic soils decreased by 62% between 1996 and 2023. The moderate and strongly sodic areas (3,207,800 ha) also corroborated the earlier estimates for Uttar Pradesh state (Singh et al., 2004).