SPATIAL-TEMPORAL DINAMIC OF SIBERIAN SILKMOTH OUTBREAK IN DARK NEEDLE CONIFEROUS FOREST IN ALTAY MOUNTAINS
Elena Victorovna Fedotova, Anastasiya Igorevna Zarechneva
Abstract
The aim of the work is to analyze the possibilities of remote sensing data of medium and high spatial resolution to study the dynamics of fir stands damage by Siberian silkmoth in the Republic of Altai. The outbreak of Siberian silkmoth occurred in 2010-2014. Landsat and Resurs-P Geoton multispectral images were used. Estimations of the damaged forests area and its landscape parameters were made, using the ASTER digital elevation model. The first significant damage and mortality of dark coniferous forests occurred on the slopes of the southwestern exposures, then in the following years, the death of stands spread to the lower and upper portions of the slopes and at least partially warmed the eastern slopes. The area of dead stands is about 6 th. ha. Spectral characteristics of healthy and damaged forest stands on Landsat images most significantly differ in the mid-IR range of 2.11 - 2.29 microns for Landsat8 OLI (channel 6) or 2.08 - 2.35 microns for Landsat7 ETM + (channel 7). Interpretation of high spatial resolution Resurs-P Geoton data allows to allocate the area of partial stands damage. Estimated area of partial damaged forests - about 8 th. ha.. The most informative is the near-infrared range.