Mapping boreal vegetation inder conditions of a disturbance regime: a case from the southern boreal subzone in the Russian Far East|
Pavel V. KRESTOV 1, 2
1 Botanical Garden-Institute FEB RAS, Vladivostok, Russia
2 Institute of Biology and Soil Science, Vladivostok, Russia
A prototype vegetation map of the eastern Asian sector of circumboreal zone was
prepared to represent of a portion the middle and southern subzone of boreal
zone that included a gradient of regional climates from subcontinental to suboceanic.
The vegetation pattern of the area is complicated because it 1) occurs
along a gradual transitional zone between typical temperate and boreal macrobioclimates;
2) has had a long historical period of fire and logging; and 3) is represented
by two principal boreal vegetation types – larch and spruce forests. Postfire
succession in the areas of spruce forests results in the formation of spruce
stands, but various factors may hinder succession from the standard sequence.
The unstable climate in combination with marginal permafrost and soil freezing
regime is greatly compounded by a diversity of substrates that make the pattern
post-fire forest succession more complicated. In the spruce forested area with low
temperatures, fires have not only a direct effect on forests, but also change the
soil freezing regime and may result in different post-fire succession sequences
toward the formation of long-term larch forests. Because such forests are relatively
permanent and occupy extensive areas, it is important to show them in a map of
potential vegetation in the scale 1 : 7 500 000. The present study was undertaken with the support of the Russian Foundation for Basic Research (grants no. 10-04-00985 and 11-04-92112).
© 2012 Organizing Committee