Chodak, Marcin
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inżynieria środowiska, górnictwo i energetyka
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Item type:Article, Access status: Open Access , Zmiany widm w bliskiej podczerwieni (NIR) w poziomach organicznych pod drzewostanami bukowymi i świerkowymi(Wydawnictwa AGH, 2006) Chodak, MarcinSpectral methods utilizing different ranges of electromagnetic radiation may be applied to study soil organic matter quality. The objective of this study was to compare near infrared (NIR) spectra of organic layers under beech, spruce and mixed forest stands and to assign the observed spectral changes to chemical alterations of organic matter. Compared were second derivatives of the NIR spectra. The NIR spectra changed gradually in organic layers. The changes of intensities of the peaks, which may be assigned to certain chemical structures, reflected the changes in abundance of these structures and indicated differences among the studied stands resulting probably from different chemical composition of organic matter under different stands. The analysis of spectra indicated an increase of relative absorbance of the peaks at 2320 nm and 2360 nm within organic horizons, suggesting an increase of aliphatic compounds. On the contrary, the relative absorbance of the peaks at 1680 nm, 2140 nm and 2170 nm decreased within the organic horizons suggesting relative decrease of aromatic structures with depth. It was concluded that calibration of NIR spectra with standard chemical methods might enable application of NIR spectroscopy for quantitative assessment of chemical changes of soil organic matter during humification process.Item type:Article, Access status: Open Access , Zastosowanie spektroskopii w bliskiej podczerwieni (NIR) do oznaczania zawartości C, N, S, P i kationów metali w materii organicznej gleb leśnych(Wydawnictwa AGH, 2005) Chodak, MarcinFast and cost-effective analytical methods may be required in land-scape-scaled soil research. The objective of this study was to assess the usefulness of near infrared spectroscopy (NIRS) to measure total contents of C, N, P, S, Na, K, Ca, Mg, Mn, Fe, Al, Zn, Cu, Cd and Pb in organic layers of forest soils. The forest floor samples (n = 158) were analysed for contents of the considered elements using standard methods. The speetra were recorded in Vis-Nir region (400-2500 nm). A half of the sample population was used to develop calibration equations and a second half was used for validation. NIRS predicted well the contents of C, N, S, Na, K, Fe, Al and Pb - the regression coefficients a of a linear regression (measured against predicted values) ranged from 0.89 to 1.05 and the correlation coefficients r from 0.88 to 0.97. The contents of Ca, Cu and Cd were predicted satisfactorily (r = 0.81-0.85, a = 1.09-1.13). NIRS failed to predict the contents of P, Mg and Zn (r = 0.69-0.78, a = 0.67-1.19). This failure was probably due to restricted number of samples used for calibration (P) or due to the presence of the samples from limed forest stands. The presented results indicate usefulness of NIRS to measure contents of several elements in forest floors in land-scape-scaled monitoring.