Helanshan montane conifer forests

Ecoregion: Helanshan montane conifer forests
	Ecoregion territory (in purple)
Ecology
Realm	Palearctic
Biome	Temperate broadleaf and mixed forest
Geography
Area	24,605 km2 (9,500 sq mi)
Countries	China
Coordinates	38°54′N 105°58′E

The Helanshan montane conifer forests ecoregion (WWF ID:PA0508) covers an isolated, forested mountain range surrounded by desert and semi-arid basins. As such, it has been called a "mountain island in the sky", and supports endemic species of plants and animals.[1][2] The region supports the endangered Helan Shan pika.

Location and description

The Helan Mountains ecoregions lies to the east of the Alashan Plateau semi-desert ecoregion, and to the west of the Ordos plateau steppe ecoregion. It is thus surrounded by arid basins. The mountain range is 180 km long, and reaches a peak altitude of 3,556 meters. The lower valleys between ridges are less forested.

Climate

The climate of the ecoregion is cold semi-arid (Köppen climate classification (BSk)). This climate is generally characterized as a 'steppe' climate, with precipitation greater than a true desert, and also a colder temperature.[3][4]

Flora and fauna

Within the ecoregion, tree cover depends on the altitude zone. The lower slopes of the mountains are semi-arid, supporting short Siberian elm (Ulmus pumila) trees near intermittent streams. The valleys also support stands of Chinese red pine (Pinus tabuliformis). Higher on the hillsides are drought-adapted shrubs of rose, elm, caranga, ostryopsis (a type of birch tree), and juniper. At the highest elevations, tree cover is mostly dragon spruce (Picea asperata, birch and poplar.)[1]

References

"Helanshan montane conifer forests". World Wildlife Federation (WWF). Retrieved November 28, 2019.
"Map of Ecoregions 2017". Resolve, using WWF data. Retrieved September 14, 2019.
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 September 14, 2019.CS1 maint: multiple names: authors list (link)
"Dataset - Koppen climate classifications". World Bank. Retrieved September 14, 2019.

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[wwf-1] "Helanshan montane conifer forests". World Wildlife Federation (WWF). Retrieved November 28, 2019.

[ecomap-2] "Map of Ecoregions 2017". Resolve, using WWF data. Retrieved September 14, 2019.

[kop-3] 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 September 14, 2019.CS1 maint: multiple names: authors list (link)

[kop-data-4] "Dataset - Koppen climate classifications". World Bank. Retrieved September 14, 2019.