Overview

Distribution

Range Description

This species is found in China: southwest Sichuan and northwest Yunnan, in the deep gorges of the Jinsha (Yangtse), Langcang (Mekong) and Nu (Salween) Rivers, also along some western tributaries of the Yalong River in south Sichuan. Its extent upstream into Xizang (Tibet) is not known. It apparently has established itself successfully in the Western Hills south of Kunming and probably elsewhere in the dry hills of central Yunnan, but that is well outside its natural range.
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?Guizhou, SW Sichuan, C and NW Yunnan, SE Xizang
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Physical Description

Morphology

Description

Trees to 25 m tall; trunk to 80 cm d.b.h.; crown conical when young, rounded or broadly domed when old; branches densely arranged; branchlets spreading or drooping but not pendulous, thin, ultimate ones 4-angled, 0.8-1 mm in diam. Leaves closely appressed, slightly glaucous abaxially, 1-2 mm on ultimate branchlets, ridged or ± gibbous with an inconspicuous or more visible abaxial gland, base long decurrent on leading branchlets, apex acute or slightly obtuse. Pollen cones subglobose or oblong, (4-)5-7 mm; microsporophylls (12-)16-20. Seed cones dark brown or purplish brown when ripe, glaucous, globose, 1.5-3.2 cm in diam.; cone scales (6-)8-10, each fertile scale with numerous seeds. Seeds brown or purplish brown, 3-5 mm, with 3 ridges. 2n = 22*.
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Diagnostic Description

Synonym

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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
In mountain forests dominated by Pinus densata and/or deciduous or evergreen Quercus, Castanopsis, or Castanea, often gregarious. In many areas introduced and under deforestation and grazing pressures invading into scrubland and grassland; also widely planted in or near villages. Trees of this species observed on steep slopes above the Mekong (Langcang) River in NW Yunnan were not associated with other trees and appeared to grow in the wild. There were trees in all age classes including senescent; a grove of very large trees near the river bridge NW of Dêqên is probably a remnant of old growth forest now protected by the local Buddhist people. This species grows naturally in rocky or gravelly loamy sand or scree over limestone or metamorphic rocks on the lower slopes of the deep V-shaped river valleys under semi-xeric conditions. Its altitudinal range in natural stands is probably between 1900 m and 3300 m a.s.l.

Systems
  • Terrestrial
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* Forests on mountain slopes; 1400-3300 m.
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Cupressus austrotibetica

The following is a representative barcode sequence, the centroid of all available sequences for this species.


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Barcode data: Cupressus duclouxiana

The following is a representative barcode sequence, the centroid of all available sequences for this species.


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Statistics of barcoding coverage: Cupressus duclouxiana

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 5
Specimens with Barcodes: 5
Species With Barcodes: 1
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Statistics of barcoding coverage: Cupressus austrotibetica

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 5
Species With Barcodes: 1
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
DD
Data Deficient

Red List Criteria

Version
3.1

Year Assessed
2013

Assessor/s
Zhang, D & Christian, T.

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

Contributor/s

Justification

All the information provided for the previous CSG assessment is based on field observations and an evaluation of herbarium specimen data. A search of available literature has produced no examples of research focused on this species. Direct observations have seen only two populations that can be thought of as natural, and there may be many more in the deep river gorges that have not been surveyed or in any way recorded.

The scant information available, the lack of any specific research, and the fact that this species is so widely cultivated throughout Yunnan and Sichuan all indicate the need for further research to ascertain the true extent of the distribution of natural populations and their conservation status, and consequently more reliable EOO and AOO figures.

For these reasons the category DD has been applied.

History
  • 2002
    Endangered
  • 1998
    Data Deficient
    (Oldfield et al. 1998)
  • 1998
    Data Deficient
  • 1997
    Rare
    (Walter and Gillett 1998)
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Population

Population
The population is probably decreasing due to poor regeneration and past and recent exploitation.

Population Trend
Decreasing
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Threats

Major Threats
The truly wild and natural (old growth) stands of this species are extremely rare and scattered in the deep gorges of the great rivers in NW Yunnan, a few on tributaries. Some are protected by local Buddhist tradition as holy trees or groves, but adequate reserves and/or legislation to protect these trees from logging and firewood collecting are absent at present. Regeneration is problematic due to livestock grazing, and fire is a potential hazard to the few remaining good stands of old growth trees, several of which are near roads or villages.
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Management

Conservation Actions

Conservation Actions
Since 1998 cutting of old-growth forest in western China has been prohibited.
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Wikipedia

Cupressus duclouxiana

The Chinese Cypress (Cupressus duclouxiana) is a species of conifer in the Cupressaceae family.

It is endemic and found only in China. Its natural habitat is temperate forests.

It is threatened by habitat loss.

Sources[edit]

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