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Volume 41, Issue 2 (2026)
GeoRes 2026, 41(2): 1001-1022 |
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Received: 2026/08/24 | Accepted: 2026/09/18 | Published: 2026/07/19
Received: 2026/08/24 | Accepted: 2026/09/18 | Published: 2026/07/19
How to cite this article
Absalan E, Amirahmadi A, Golimokhtari L. Geomorphological Analysis of Soil Organic Carbon Sequestration Potential in Landforms of Miandasht Jajarm and Chehel-Dokhtaran South of Esfarayen Regions. GeoRes 2026; 41 (2) :1001-1022
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Abstract (271 Views)
oAims & Backgrounds: The increase in greenhouse gases, particularly carbon dioxide in the atmosphere, is a major environmental challenge for sustainable development, and carbon sequestration is a fundamental solution to mitigate it. The present study was conducted with the aim of determining the spatial distribution of soil organic carbon (SOC) sequestration and analyzing the controlling effect of geomorphological landforms on it in two regions: Miandasht of Jajarm (protected area) and Chehel-Dokhtaran of Esfarayen (free-management area).
Methodology: This study was conducted using a survey-laboratory method combined with generalized linear modeling (GzLM). To identify the landforms, Landsat satellite imagery was integrated with a 30-meter resolution Digital Elevation Model (DEM). Stratified random sampling was performed across a total of 38 points (at a depth of 0–30 cm), and the soil organic carbon content was determined in the laboratory using the Walkley-Black wet oxidation method. Due to the non-normal distribution and positive skewness of the soil organic carbon data, a GzLM with a gamma distribution and a logarithmic link function was utilized.
Findings: The results showed that the mean soil organic carbon (SOC) content in Miandasht (0.268%) was higher than that in Chehel-Dokhtaran (0.199%). Among the identified landforms , floodplains exhibited the highest sequestration capacity due to their textural characteristics and sediment stability. The GzLM analysis (significance level < 0.001) confirmed that the geomorphological structure was the primary factor driving variations in SOC, whereas neither the independent macro-level management status nor the interaction effect between management and landforms was statistically significant.
Conclusion: Soil organic carbon distribution in the region is completely governed by the inherent characteristics of landforms. Erosion processes, in badlands due to the lithological sensitivity of marly formations and continuous topsoil washing, override the natural carbon sequestration capacities. Conversely, lowlands exhibit a higher potential for carbon stability dueto the formation oforgano-mineral complexes.
Methodology: This study was conducted using a survey-laboratory method combined with generalized linear modeling (GzLM). To identify the landforms, Landsat satellite imagery was integrated with a 30-meter resolution Digital Elevation Model (DEM). Stratified random sampling was performed across a total of 38 points (at a depth of 0–30 cm), and the soil organic carbon content was determined in the laboratory using the Walkley-Black wet oxidation method. Due to the non-normal distribution and positive skewness of the soil organic carbon data, a GzLM with a gamma distribution and a logarithmic link function was utilized.
Findings: The results showed that the mean soil organic carbon (SOC) content in Miandasht (0.268%) was higher than that in Chehel-Dokhtaran (0.199%). Among the identified landforms , floodplains exhibited the highest sequestration capacity due to their textural characteristics and sediment stability. The GzLM analysis (significance level < 0.001) confirmed that the geomorphological structure was the primary factor driving variations in SOC, whereas neither the independent macro-level management status nor the interaction effect between management and landforms was statistically significant.
Conclusion: Soil organic carbon distribution in the region is completely governed by the inherent characteristics of landforms. Erosion processes, in badlands due to the lithological sensitivity of marly formations and continuous topsoil washing, override the natural carbon sequestration capacities. Conversely, lowlands exhibit a higher potential for carbon stability dueto the formation oforgano-mineral complexes.