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2013年五一期间,陕西师范大学植物分类专家任毅教授一行,在陕西化龙山国家级自然保护区及其周边地区进行了珍稀濒危植物调查。调查中,在化龙山国家级自然保护区毗连的镇坪县小河口,发现了中国特有珍稀濒危植物长序榆10株。已故老一辈植物研究学者李家骏研究员曾经在《陕西林业》1994年第3期《镇坪县发现国家一级保护植物长序榆》一文中记载(笔者注:按照1999年发布的“国家重点保护野生植物名录”第一批,长序榆被列为国家二级保护植物):“我们1991年进行化龙山自然保护区考
During May 1, 2013, Professor Ren Yi, a plant taxonomy expert in Shaanxi Normal University, conducted a survey of rare and endangered plants in Shaanxi Hualongshan National Nature Reserve and its surrounding areas. During the investigation, 10 species of endemic endangered plants of endemic China were found in Xiaohekou, Zhenping County adjoining Huolongshan National Nature Reserve. Researcher Li Jiajun from the late old botanical research scientist once recorded in the article ”Shaanxi Forestry“ 1994 No.3 ”Found in the county of Changping County, the first order to protect the plant elm,“ (Note: According to the 1999 ”Country Focus on the protection of wild plants List “The first batch of long-sequence elm was listed as two national protected plants): ” We conducted in 1991 Huilongshan Nature Reserve test