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Envisat-MERIS and SPOT Vegetation satellite data were tested for estimation of vegetation cover disturbances caused by fire and industrial pollution in central and northern Siberian test sites, respectively. MERIS data were used to assess forest disturbance levels on burned sites in Angara region. Chlorophyll indexes (REP and MTCI) were found to allow identifying up to five forest disturbance levels...
This paper presents an intercomparison of two burned area datasets, the L3JRC daily global burned area dataset derived from SPOT-VEGETATION and the FFID burned area dataset from MODIS. Burned area dynamics are presented and the influence of climate on the fire regime is discussed. Feedbacks of the fire dynamics to the climate system are evaluated. The Russian fire danger index is presented and compared...
Space-temporal dynamics of secondary mixed fir-aspen forest types is considered by the example of the communities typical of chern forest zone (Abies sibirica – Populus tremula + Athyrium filix-femina – Matteuccia struthiopteris – Anemone baicalensis) in perhumid and moderate-continental climate of the Altai-Sayan Ecoregion (South Siberia). Different variants of 40-year-long succession typical of...
Dark needle coniferous (DNC: Siberian pine, spruce, fir) expansion into larch dominated area was investigated along transects, oriented from the west and south borders of the larch dominated communities to its centre. The expected invasion of DNC into larch habitat was quantified as an increase of the proportion of those species both in the overstory and regeneration. Abundance and invasion potential...
Siberian climate change investigations had already registered climate warming by the end of the twentieth century, especially over the decade of 1991–2000. Our goal is to model hot spots of potential climate-induced vegetation change across central Siberia for three time periods: from 1960 to 1990, from 1990 to 2020 and from 1990 to 2080. January and July temperature and annual precipitation anomalies...
The long-term wildfire dynamics, including fire return interval (FRI), in the zone of larch dominance and the “larch-mixed taiga” ecotone were examined. A wildfire chronology encompassing the fifteenth through the twentieth centuries was developed by analyzing tree stem fire scars. Average FRI determined from stem fire scar dating was 82 ± 7 years in the zone of larch dominance. FRI was found to be...
A major focus of the study described here is an attempt to reveal the nature of local and any widespread tree-growth responses to the recent warming seen in the instrumental observations. Namely, this chapter discusses spatial variation in the trends of radial tree-ring growth in Siberia and the Far East during different periods of the 18th to 20th centuries. That distribution of trends is compared...
The tree response to climate trends is most likely observable in the forest-tundra ecotone, where temperature limits tree growth. Here we show that trees in the forest-tundra ecotone of the mid of the south Siberian Mountains responded strongly to warmer temperatures during the past two decades. There was a growth increment increase, stand densification, regeneration propagation into the alpine tundra,...
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