East European Forest Steppe
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East European Forest Steppe
Ecoregion: East European forest steppe
20140614 151745 Richtone(HDR).jpg
Central Black Earth Nature Reserve, an example of forest steppe terrain, in Kursk Oblast, Russia
Ecoregion territory (in purple)
Ecoregion territory (in purple)
Ecology
RealmPalearctic
BiomeTemperate Broadleaf and Mixed Forests
Geography
Area727,269 km2 (280,800 sq mi)
CountriesRussia, Ukraine, Moldova, Romania and Bulgaria

The East European forest steppe ecoregion (WWF ID:PA0419) is a patchwork of broadleaf forest stands and grasslands (steppe) that stretches 2,100 km across eastern Europe from the middle of Ukraine to the Ural Mountains in Russia. There are also isolated areas of similar character off the western end in eastern Romania, Moldova, and Bulgaria. The region forms a transition zone between the temperate forests to the north, and the steppe to the south. The forest-steppe is an area of Russia in which precipitation and evaporation are approximately equal.[1] The ecoregion is in the Palearctic ecozone, with a Humid Continental climate. It covers 727,269 km2 (280,800 sq mi).[2]

Location and description

The ecoregion forms a long band, about 2,100 km long and 600 km wide, from Ukraine in the west to western edge of Siberia at the Ural Mountains in the east. Most of the terrain is rolling hills and some plains. Average elevations range from 150 meters (above sea level) in the lowlands to 250 meters in the hills, with some isolated ranges of low mountains on the edges of the area.[1][2][3]The ecoregion can be divided into sub-provinces from west to east: Dnieper Upland, Dnieper Lowland, Central Russian Upland, Oka-Don Plain, Volga Upland, and the Trans-Volga. Moisture diminishes as the ecoregion stretches to the east, as does the forest fragmentation.[4]

Climate

The climate in most of the ecoregion is Humid continental climate, warm summer (Köppen climate classification (Dfb)). This climate is characterized by large seasonal temperature differentials and a warm summer (at least four months averaging over 10 °C (50 °F), but no month averaging over 22 °C (72 °F).[5][6]. The summers become hotter and the winters colder as you move east across the ecoregion, due to the movement towards the center of the continent ("continentality").

Flora and fauna

For centuries, scientists have speculated on the causes of variations in stands of trees. It is currently understood that on the macro level, steppes are more arid and that trees thin out in the transition zones. Because the terrain of the ecoregion is relatively flat or low hills, with no physical barriers between the biomes to the north and south, the plant communities tend to be shaped by local variations in water flow. Differences in drainage, variations in soil type (pine trees on sandy soil, deciduous trees on loamy soil, etc.) and salinity, the effects of blowing wind (which drives snow off the hills into depressions, affecting soil quality), and the historic activities of humans all combine to create the mosaic character of the region.[1]

Open landscapes show that steppe plant communities can compete with forest. Sedges are characteristic in the steppe areas, resisting low-moisture conditions with much of their biomass underground.[7]

Protections

The East European forest steppe has been affected heavily by human pressure: over half is arable land, and the natural forest stands have mostly been cleared. Little of the territory is legally protected as nature reserves, and such reserves that exist tend to be small tracts set aside for study. Representative protected areas in the ecoregion include:

See also

References

  1. ^ a b c "Biomes and Regions of Northern Eurasia - Steppe and Forest Steppe". Russian Nature. Retrieved 2018.
  2. ^ a b "East European forest steppe". Ecoregions of the World. GlobalSpecies.org. Retrieved 2018.
  3. ^ "PA0419: Eastern Europe: Bulgaria, Moldova, Romania, Russia, and Ukraine". World Wildlife Federation. Retrieved 2018.
  4. ^ "Biomes and Regions of Northern Eurasia - Classifications: Zonal and Provincial Differences". Russian Nature. Retrieved 2018.
  5. ^ Kottek, M., J. Grieser, C. Beck, B. Rudolf, and F. Rubel, 2006. "World Map of Koppen-Geiger Climate Classification Updated" (PDF). Gebrüder Borntraeger 2006. Retrieved 2019.CS1 maint: multiple names: authors list (link)
  6. ^ "Dataset - Koppen climate classifications". World Bank. Retrieved 2019.
  7. ^ "Biomes and Regions of Northern Eurasia - Biological Diversity". Russian Nature. Retrieved 2018.

External links


  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.

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