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新华社昆明8月17日电(记者姚兵)研究人员在云南省西双版纳州发现一水龙骨科薄唇 蕨属新种——勐宋薄唇蕨。相关研究成果近日发表在国际植物分类学刊物《Phytotaxa》上。
据论文第一作者、国家林业局昆明勘察设计院自然保护规划设计所工程师赵明旭博士介绍,该新种发现于布龙州级自然保护区海拔1700米左右热带山地森林中,附生于林中树干上,被命名为勐宋薄唇蕨。布龙州级自然保护区位于西双版纳西南部,是以热带雨林为主的森林生态系统和珍稀濒危野生动植物资源为主要保护对象的自然保护区。
“我们从形态学、孢粉学和分子生物学等方面对该种进行了分析研究,发现新物种与已知物种具柄线蕨和薄唇蕨最接近,但在叶形二型性、孢子囊群形态等方面存在较大差异,这些差异在利用叶绿体DNA片段rbc-L进行对比分析时,也得到良好印证。”赵明旭说,尽管最近编纂的英文版《中国植物志》(Flora of China)已将线蕨属和薄唇蕨属合并为薄唇蕨属,但两个属之间的由线形孢子囊群过渡到毡形(卤蕨型)的物种尚未发现,勐宋薄唇蕨可能正是一个填补空白的类群,可这个猜测尚需更深入的研究来证明。
据介绍,勐宋薄唇蕨目前仅在布龙州级自然保护区勐宋片区发现有分布,分布面积约2平方公里,个体数量仅100株左右,根据世界自然保护联盟的物种濒危等级评价标准,该物种被评估为极危种,亟需加强保护。
赵明旭说,像勐宋薄唇蕨一样无人知晓的新物种尽管数量不多,但在生态系统中可能是非常重要的一环,为有效降低这些物种“未被认识,就已绝灭”的风险,建议进一步加强自然保护本底资源调查工作力度。
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