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<p>The lower Meghna River Estuary is a newly accreted subtropical coastal region adjacent to the Bay of Bengal that experiences regular inundation due to the semi-diurnal tidal effect. The study aimed to investigate the seasonal and spatial distribution of soil organic carbon (SOC) and assess the relationship between SOC and soil electrical conductivity (EC). This study provides the first combined seasonal–spatial assessment of SOC-salinity interactions in newly accreting coastal lands of Bangladesh. A total of 216 soil samples were collected from 24 sampling sites on the newly accreted lands of Noakhali District, located in the south-central coastal zone of Bangladesh. A significant variation in SOC across different depths and seasons, where the highest abundance of SOC was found (ranging between 3.01 and 3.44%) at a depth of 0–10&#xa0;cm during all three seasons, with percentages of 3.01% in winter, 3.42% in monsoon, and 3.44% in post-monsoon. Conversely, the lowest SOC percentages were observed at a depth of 21–30&#xa0;cm (2.11% in winter, 2.29% in monsoon, and 1.99% in post-monsoon). The area was classified as extremely saline, and SOC generally decreased with increasing EC. The study enhances our understanding of the correlation between SOC and EC in the coastal region, providing crucial insights for future soil management. These findings highlight the role of salinity in shaping carbon distribution and offer guidance for soil management and agricultural planning in rapidly evolving coastal environments.</p>

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Seasonal and Spatial Variation of Soil Organic Carbon and Electrical Conductivity in Newly Accreting Lands of the Lower Meghna River Estuary

  • 期刊论文

  • 发表日期：

    2026年3月19日

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  • Nur Pasha Sufian,
  • Razat Suvra Das,
  • Mohammad Abdul Momin Siddique

摘要

The lower Meghna River Estuary is a newly accreted subtropical coastal region adjacent to the Bay of Bengal that experiences regular inundation due to the semi-diurnal tidal effect. The study aimed to investigate the seasonal and spatial distribution of soil organic carbon (SOC) and assess the relationship between SOC and soil electrical conductivity (EC). This study provides the first combined seasonal–spatial assessment of SOC-salinity interactions in newly accreting coastal lands of Bangladesh. A total of 216 soil samples were collected from 24 sampling sites on the newly accreted lands of Noakhali District, located in the south-central coastal zone of Bangladesh. A significant variation in SOC across different depths and seasons, where the highest abundance of SOC was found (ranging between 3.01 and 3.44%) at a depth of 0–10 cm during all three seasons, with percentages of 3.01% in winter, 3.42% in monsoon, and 3.44% in post-monsoon. Conversely, the lowest SOC percentages were observed at a depth of 21–30 cm (2.11% in winter, 2.29% in monsoon, and 1.99% in post-monsoon). The area was classified as extremely saline, and SOC generally decreased with increasing EC. The study enhances our understanding of the correlation between SOC and EC in the coastal region, providing crucial insights for future soil management. These findings highlight the role of salinity in shaping carbon distribution and offer guidance for soil management and agricultural planning in rapidly evolving coastal environments.