title: Bark removal and population structure of Taxus wallichiana Zucc. in a temperate mixed conifer forest of western Himalaya.
abstract: Taxus wallichiana Zucc. (Himalayan yew) represents one of the most threatened medicinal tree species of the Himalayan region. Heavy exploitation of its bark and leaves for taxol® has resulted in decline in its population. Generating quantitative information on Himalayan yew has therefore been stressed. The present paper provides information on the population and bark removal of Himalayan yew from one of the interior areas of Himalaya. Total count and quadrat method were deployed to generate quantitative information on its population while bark removal was estimated based on depth and extent of bark removed. After analyzing the existing information and the results of the study, a rapid vulnerability assessment (RVA) of the species was carried out. Taxus reported a density of 72 individuals/ha and was present as an under canopy of Picea smithiana. Complete stripping of bark was observed in 11 % of the Taxus population which amounted to ca. 18,152.86 cm(3) of bark removed. The age class distribution showed complete absence of seedlings and saplings. RVA scores also reported higher values (26) thereby pointing toward the high vulnerability of this species. Across its entire distributional range, Taxus population is under severe pressure. It is high time when few patches of Taxus are demarcated as Medicinal Plant Conservation Areas, and detailed studies on its autecology are initiated.
authors: Biodiversity Division, CSIR-Institute of Himalayan Bioresource Technology, Post Box # 6, Palampur, 176061 Himachal Pradesh, India. suniyal@ihbt.res.in
authors: Sanjay Kr
authors: SK
authors: Uniyal
mesh_terms: D003247:Conservation of Natural Resources; D056727:Endangered Species; D004784:Environmental Monitoring; D007194:India; D017239:Paclitaxel / Q000032:analysis; D024301:Plant Bark / Q000737:chemistry*; D010946:Plants, Medicinal / Q000254:growth & development*; D020946:Taxus / Q000254:growth & development*; D014197:Trees / Q000254:growth & development
chemical_list: D017239:Paclitaxel