Abstract
Soil quality (SQ) modeling and mapping is a leading research field aiming to provide reproducible and cost-effective yet accurate SQ predictions at the landscape level. This endeavor was conducted in a complex watershed in northern Iran. We classified the region into spectrally and topographically homogenous land units (average area of 48 ± 23 ha) using object-based segmentation analysis. Following the physicochemical analysis of soil samples from 98 stations, the Nemoro soil quality index (SQIn) was produced using the minimum dataset procedure and a non-linear sigmoid scoring function. SQIn values averaged 0.21 ± 0.06 and differed statistically between major land uses. To predict and map SQIn for each land unit, the best-performing regression model (F(3, 84) = 45.57, p = 0.00, R2 = 0.62) was built based on the positive contribution of the mean Landsat 8-OLI band 5, and negative influence of land surface temperature retrieved from Landsat 8-OLI band 10 and surface slope (t-test p-values < 0.01). Results showed that dense-canopy woodlands located in low-slope land units exhibit higher SQIn while regions characterized by either low-vegetation or steep-sloped land units had SQ deficits. This study provides insights into SQ prediction and mapping across spatially complex large-scale landscapes.
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Fatemeh Aghalari: Conceptualization, Contributor to data interpretation, Contributor to manuscript preparation.
Elham Chavoshi: Methodology, Data interpretation, Writing-Original draft preparation.
Sattar Chavoshi Borujeni: Contributor in data interpretation, Data Validation.
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Aghalari, F., Chavoshi, E. & Borujeni, S.C. Indexing and segment-level mapping of soil quality in a spatially complex watershed in northern Iran. Environ Monit Assess 196, 51 (2024). https://doi.org/10.1007/s10661-023-12212-7
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DOI: https://doi.org/10.1007/s10661-023-12212-7