کنفرانس ملی مهندسی و مدیریت محیط زیست

صفحه اصلی / هفتمین کنفرانس ملی مهندسی و مدیریت محیط زیست

Spectral Characterization of Soil Clay Constituents

نویسندگان :

Majid Danesh¹ Seyed Mostafa Emadi² Mohammad Ali Bahmanyar³

1- SANRU 2- SANRU 3- SANRU

کلمات کلیدی :

Soil clay fraction،Vis-NIR-SWIR spectroscopy،Chemometrics،Reflectance spectroscopy

چکیده :

Soil clay fractions critically influence soil fertility, structure, and erosion resistance, yet traditional laboratory analysis is time-consuming, costly, and environmentally invasive. This study demonstrates the efficacy of Vis-NIR-SWIR reflectance spectroscopy combined with advanced chemometric preprocessing to rapidly and non-destructively quantify clay components in soils of Mazandaran Province, Iran. Composite 0-20 cm soil samples were analyzed using hydrometric methods, while spectral data were enhanced through averaging, Savitzky-Golay smoothing, and derivative transformations. Sensitive wavelengths were identified using regression coefficients, weighted beta analysis, and Marten’s uncertainty tests, revealing strong correlations between clay content and spectral responses at 550 nm (Vis, r = −0.63), 950 nm (NIR, r = −0.80), and 2000-2400 nm (SWIR, r = 0.88-0.89). The integrated spectroscopic-chemometric framework provided rapid, accurate, and repeatable estimation of clay fractions, outperforming conventional approaches. These findings highlight the potential of vibrational spectroscopy for high-throughput soil characterization, digital soil mapping, and sustainable land management.