Overview

Distribution

Range Description

This variety is found in China: south Gansu, north and west Sichuan.
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© International Union for Conservation of Nature and Natural Resources

Source: IUCN

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
It is found in small, pure stands in some valleys, but more commonly on rocky slopes or cliffs associated with Koelreuteria paniculata, Morus mongolica, Campylotropis delavayi, Bauhinia faberi, Cotoneaster multiflorus, and C. gracilis; in non-acidic brown soils over granites, quartzites and limestones. Based on verified herbarium collections, the altitudinal range is extensive, ranging from ca. 1200 m to 2750 m a.s.l [Atlas of the Gymnosperms of China gives 900-2800m asl]. The climate is characterized by cold winters and cool to warm summers, with a distinct alternation of dry and rainy seasons; annual precipitation varies between 500-750(-1000 mm), with a 50-70% moisture deficit. There is no recorded difference in ecology for the two varieties.

Systems
  • Terrestrial
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© International Union for Conservation of Nature and Natural Resources

Source: IUCN

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
VU
Vulnerable

Red List Criteria
B2ab(v)

Version
3.1

Year Assessed
2013

Assessor/s
Zhang, D & Christian, T.

Reviewer/s
Thomas, P. & Farjon, A.

Contributor/s

Justification

The area of occupancy (AOO) is less than 2,000 km2 with less than 10 severely fragmented locations. A continuing decline in the number of mature individuals is suspected due to illegal logging. Past reductions are known to have occurred but have not been quantified. Consequently this variety (and the species as this variety accounts for the vast majority of the specie's distribution and population) is assessed as Vulnerable.



History
  • 2000
    Vulnerable
  • 1997
    Vulnerable
    (Walter and Gillett 1998)
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© International Union for Conservation of Nature and Natural Resources

Source: IUCN

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Population

Population
The population is thought to be decreasing due to historic and recent over-exploitation.

Population Trend
Decreasing
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© International Union for Conservation of Nature and Natural Resources

Source: IUCN

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Threats

Major Threats
This variety is known from ca. 9 different locations where natural populations are now mostly restricted to more inaccessible sites such as canyons and exposed cliffs. Overcutting is the main cause of its [historic] decline but the habitat is now protected (see conservation actions). Illegal logging may still be a problem in certain locations. Natural regeneration is thought to be poor.
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© International Union for Conservation of Nature and Natural Resources

Source: IUCN

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Management

Conservation Actions

Conservation Actions
This variety is planted in villages within its natural range in Sichuan and possibly in Gansu as well. Since 1998, all old-growth forest in China has been legally protected.
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© International Union for Conservation of Nature and Natural Resources

Source: IUCN

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Disclaimer

EOL content is automatically assembled from many different content providers. As a result, from time to time you may find pages on EOL that are confusing.

To request an improvement, please leave a comment on the page. Thank you!