THE ESTIMATION OF PERTURBANCE FACTORS INFLUENCE ON VEGETATION IN THE REPUBLIC TYVA TERRITORY
11th International Multidisciplinary Scientific GeoConference SGEM2011, www.sgem.org, SGEM2011 Conference Proceedings/ ISSN 1314-2704, June 20-25, 2011, Vol. 2, 1029-1034 pp
Region forests grow on northern macroslopes of ridges from bottom to highmountainous tundra. The forest plays important role in region ecology and in the Siberia territory as a whole. The influence of vegetation fires is the most important factor of reduction of boreal region forests. Fire activity is rising basically because of the human
influence. During 35 years (1959-1994) about 33594.8 ha destroyed by wildfires. In 1995-2005 about 546088.6, ha had been destroyed by wildfires. During the period of
1999-2008 116 fires was registered on the area of 376313 ha in territory of Tyva. Fires
as the phenomena exist thanks to variation of weather from climatic norms. Especially
long drought periods are critically important in process of wildfire activity formation.
Ligtning of dry thunder-storms are the major natural cause of forest fire occurrence.
Thunder-storms are cause of 20–30 % of total fires. Increasing of quantity of fire
number that caused by dry thunder-storms, probably, is the result of global factor as
The increasing of spring and summer temperatures is observed in southern part of
Region (meteorological station Chadaana) according to the Hydrometeorological Center
of Republic Tyva data. Average warming in during 1979-2000 years in April was 1.6º
C, and in summer — 2ºC. Increase of average temperatures in summer and in spring
months and humidity increasing are the most important factors which should lead to
expansion of borders of dark coniferous forest altitude zone complex, especially to
expansion of an area of a cedar at the bottom and top borders of its growth. Essential
changes of forest was exposed on northern macroslopes within 1500–2000 m a.s.l.,
there they almost are completely covered by lichen.
Geoinformation technologies are the tool of the analysis, estimation and monitoring of boreal forests in Region. The regional geoinformation system is produced in collaboration with V.N. Sukachev Institute of Forest SB RAS (Krasnoyarsk) to complex
analysis of the factors determine fire-dangerous condition of forests depending on ecological, anthropogenic and weather factors. Databases of monitoring of various levels (on-ground and satellite) will the base of uniform architecture of information layers for fire-prevention monitoring.
Keywords: Siberia, Taiga, Mountain forest, Forest fires, Burned area, on-ground data and satellite monitoring.
PAPER 2011/s15.102: THE ESTIMATION OF PERTURBANCE FACTORS INFLUENCE ON VEGETATION IN THE REPUBLIC TYVA TERRITORY
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