O. G. Tyshchenko1, P. V. Pyvovar2, N. M. Tsydyk1
1 Institute for Safety Problems of Nuclear Power Plants, NAS of Ukraine, 12, Lysohirska st., Kyiv, 03028, Ukraine
2 Polissia National University, 7, Staryi Boulevard, Zhytomyr, Zhytomyr region, 10008, Ukraine
DOI: doi.org/10.31717/2311-8253.24.2.8
Abstract
The article presents the structural features of plant communities in the zone of contamination of radionuclides, which affected by large-scale forest fires. The areas of the Exclusion Zone and the Drevlianskyi Nature Reserve (the guaranteed resettlement zone) that affected by forest fires were identified and the extent of their damage was investigated. Using Sentinel 2 satellite imagery data, as well as forest survey data,
categories and classes of vegetation were determined. Examples of thematic maps showing the degree of fire impact on coniferous, deciduous, mixed forest ecosystems and areas with mosaic vegetation cover provided. In the areas affected by the fire, the vegetation divided according to the degree of forest damage into the following categories: heavily burned forest (dead forest), burned with small areas of vegetative trees, fire in the tree litters: heavy fire, medium-, and light fire. The statistical indicators of NDVI and NBR for defined categories of fire in plant groups revisited. The use of joint analysis of remote sensing data and ground survey information increased the validity of diagnostic thematic maps of the structure and assessment of the state of vegetation cover. The classification of vegetation structure based on remote sensing data of the Earth used as a cartographic model of the state of forest plantations for different periods: before the fire and after the fire. The satellite imagery data showed that the areas affected by the fire have a very uneven and variegated pattern of vegetation damage. The type of stand influenced the intensity of the damage and area. In coniferous stands, favorable conditions created for the spread of fire in the ecosystem, due to the accumulation of a large mass of small fraction of dry plant components. In the case of a spring fire, birch forest ecosystems characterized by a rapid course of a low-level fire of medium and low impact. Analysis of satellite images after fires of this nature shows that in the deciduous forest ecosystem, trees often resume vegetation in the same year after the fire.
Keywords: vegetation structure, forest fires, remote sensing of the Earth, geoinformation technologies, NDVI, NBR, deltaNBR.
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