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2005年4月对黑龙江省穆棱东北红豆杉(Taxus cuspidata Sieb. Et Zucc.)天然林分的组成结构、立地条件、及种群年龄结构.进行了调查研究.结果表明,该地区东北红豆杉种群生存的林分结构以天然针阔混交林为主,土壤含水量较高(40%-60%), pH值偏酸(4.7～5.5);野生东北红豆杉的种群结构不合理,属于衰退种群,这也是导致野生东北红豆杉种群下降的原因之一.虽然穆棱地区的立地条件适合东北红豆杉野生种群的生长,但目前成年东北红豆杉树干中空、腐烂,中等胸径的健壮成年树被盗伐,而且幼树经常被野生动物啃食,该地区东北红豆杉的种群仍然是下降趋势,处于濒危状态.图5表1参18.“,”An investigation was conducted on distribution pattern, site condition and population structure of yew Taxus cuspidata Sieb. Et Zucc. In Muling Forest Bureau of Heilongjiang Province, China in April, 2005. Results showed that yew is mainly distributed under the main storey of natural mixed forest of conifer and broadleaf, the soil moisture content of the yew site is high (40%-60%), the pH value of soil is relatively lower (4.7-5.5), and that the population structure of wild yew is not rational, belonging to the degeneration population, which is one of the reasons leading to the population decline. Although the site conditions of Muling area are suitable for the growth of wild yew, the population of wild yew shows a decline tendency, due to the fact that the middle-sized adult yew trees have been cut, young yews are often grazed by wildlife, and that the trunks of adult yew tend to be hollow.