Spectral response dynamics of the reforestation sites in forests of the south of Central Russian Upland
The reported study was funded by RFBR according to the research project № 18-35-20018
DOI:
https://doi.org/10.18413/2712-7443-2020-44-2-210-220Keywords:
forest stands, reforestation, Central Russian Upland, forest-steppe, spectral response, LandsatAbstract
The study of reforestation processes on clear cutting is one of the key tasks in monitoring forest lands. It is especially relevant for territories in which significant areas of forests have been covered by felling in the past or present. The results of spectral response dynamics analysis of the former clean felling due to reforestation are presented. Spectral response was estimated based on Landsat data from 1985–2015 in various spectral ranges. The study was conducted for broad-leaved forests typical of the south of the Central Russian Upland. The spectral response of forest areas that differ in the main forest-forming species is compared. For forests with a predominance of oak or ash in the upper tiers, no statistically significant differences were found in the infrared spectral ranges. In the infrared ranges (SWIR1 and SWIR2), a tendency toward a decrease in reflection due to the formation of forest stands was revealed. The formation of stands 23–25 years old leads to a 15 % decrease in reflectance in the range of 1,55–1,75 μm and by 30 % in the range of 2,09–2,35 μm. An increase in the age of forest stands on clear-cutting leads to a decrease in the coefficients of variation of reflective features. The greatest decrease in reflectances is observed in the first 3-4 years after the start of the reforestation process.
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