An evaluation of the endangerment status of Sinochasea trigyna (Poac- eae) endemic to the Qinghai-Tibet Plateau

doi:10.3724/SP.J.1003.2012.05016

Abstract

Abstract:

Sinochasea trigyna Keng (Family Poaceae) is endemic to the Qinghai-Tibet Plateau, and is listed as a second class national protected wild plant. The data about this monotypic genus is very scanty since its material difficult to acquire. According to the criterion of IUCN, the endangered level of S. trigyna is evaluated as VU B2ab(iii) based on the data from field investigations, herbarium records and the published literature. In this paper, we also reported the chromosome number (i.e. 2n = 22) and the type microchromosome of S. trigyna, which are both novel findings.

Key words: Qinghai-Tibet Plateau, Sinochasea trigyna, cytology, endangered

Weiwei Li, Hui Zhang, Lina Zhao, Ying Bao, Wenli Chen. An evaluation of the endangerment status of Sinochasea trigyna (Poac- eae) endemic to the Qinghai-Tibet Plateau[J]. Biodiv Sci, 2012, 20(6): 769-773.

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URL: https://www.biodiversity-science.net/EN/10.3724/SP.J.1003.2012.05016

https://www.biodiversity-science.net/EN/Y2012/V20/I6/769

Figures/Tables 4

References 16

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居群编号 Population	地点 Locality	生境 Habitat	海拔 Altitude (m)	分布面积 Population area (m²)	居群大小(株) Population size (individual)	凭证标本 Voucher	染色体数目 Chromosome number
S1	四川稻城 Daocheng, Sichuan	杜鹃灌丛草甸的多石地带 Stony land among Rhododendron shrub meadow	4,430	1,000	~10,000	陈文俐, 张慧208 Chen Wenli, Zhang Hui 208	2n = 22
S2	西藏定日 Tingri, Tibet	山坡冲积沟, 多石, 锦鸡儿灌丛草甸 Stony land, diluvial ditches among Caragana shrub meadow	4,881	100	~500	陈文俐, 张慧372 Chen Wenli, Zhang Hui 372	2n = 22
S3	西藏申扎 Xainza, Tibet	雪山下, 阳坡, 多石 Stony land of sunny slope of jokul	4,729	1,000	~300	陈文俐, 张慧410 Chen Wenli, Zhang Hui 410	2n = 22
S4	西藏察隅 Zayü,Tibet	山顶草甸、杜鹃灌丛 Rhododendron shrub meadow	4,803	200	~100	陈文俐, 张慧103 Chen Wenli, Zhang Hui 103
S5	西藏左贡 Zogong, Tibet	圆柏灌丛间, 小溪旁, 砾石间 Stony land along the stream among Sabina shrub meadow	4,900	80	~300	陈文俐, 张慧115 Chen Wenli, Zhang Hui 115
S6	西藏南木林 Namling, Tibet	阳坡草甸、冲积沟多石处 Stony land along the diluvial ditches of sunny slope meadow	5,135	10,000	~300	陈文俐, 张慧411 Chen Wenli, Zhang Hui 411
S7	西藏浪卡子 Nagarzê, Tibet	阳坡草地、溪旁、石缝间、冲积沟 Rock crevices and stony land along the diluvial ditches and stream of sunny grass slope	5,006	1,600	~150	陈文俐, 张慧417 Chen Wenli, Zhang Hui 417
居群平均值 Average				1,997	~1,660

居群编号 Population	地点 Locality	生境 Habitat	海拔 Altitude (m)	分布面积 Population area (m²)	居群大小(株) Population size (individual)	凭证标本 Voucher	染色体数目 Chromosome number
S1	四川稻城 Daocheng, Sichuan	杜鹃灌丛草甸的多石地带 Stony land among Rhododendron shrub meadow	4,430	1,000	~10,000	陈文俐, 张慧208 Chen Wenli, Zhang Hui 208	2n = 22
S2	西藏定日 Tingri, Tibet	山坡冲积沟, 多石, 锦鸡儿灌丛草甸 Stony land, diluvial ditches among Caragana shrub meadow	4,881	100	~500	陈文俐, 张慧372 Chen Wenli, Zhang Hui 372	2n = 22
S3	西藏申扎 Xainza, Tibet	雪山下, 阳坡, 多石 Stony land of sunny slope of jokul	4,729	1,000	~300	陈文俐, 张慧410 Chen Wenli, Zhang Hui 410	2n = 22
S4	西藏察隅 Zayü,Tibet	山顶草甸、杜鹃灌丛 Rhododendron shrub meadow	4,803	200	~100	陈文俐, 张慧103 Chen Wenli, Zhang Hui 103
S5	西藏左贡 Zogong, Tibet	圆柏灌丛间, 小溪旁, 砾石间 Stony land along the stream among Sabina shrub meadow	4,900	80	~300	陈文俐, 张慧115 Chen Wenli, Zhang Hui 115
S6	西藏南木林 Namling, Tibet	阳坡草甸、冲积沟多石处 Stony land along the diluvial ditches of sunny slope meadow	5,135	10,000	~300	陈文俐, 张慧411 Chen Wenli, Zhang Hui 411
S7	西藏浪卡子 Nagarzê, Tibet	阳坡草地、溪旁、石缝间、冲积沟 Rock crevices and stony land along the diluvial ditches and stream of sunny grass slope	5,006	1,600	~150	陈文俐, 张慧417 Chen Wenli, Zhang Hui 417
居群平均值 Average				1,997	~1,660