珍稀新种湖北白蜡类型和演替趋势的研究

湖北白蜡是我国特有珍稀濒危植物，仅在湖北省中部大洪山南麓残存，其自然分布区位于京山县与钟祥市接壤一条狭长地带内，现有的湖北白蜡大多为萌芽更新混交林，主要有五个类型，即湖北白蜡－铜钱树混交林，湖北白蜡－黄连木混交林，湖北白蜡－青檀混交林，湖北白蜡－三角枫混交林，湖北白蜡－菱叶海桐混交林，其中湖北白蜡处于优势地位，群落相对稳定，但在自然演替中，由于人为破坏严重，其它树种的入侵，对湖北白蜡构成严重威胁。

Resewarch on the Type and Succession Trend of Race Species Fraxinus Hupehensis

Fraxinus Hupohensix(FH)is a china endemis and rare spocies distrihuted in the south bottom ofDahong shan mountain,Wich is located a long region between zhongiang city and Jingshan county of Hubeiprovince. Existing FH are mostly mixed vegetation under sprout and there are mainly five community types:FH-paliurrus hemsleyana,FH-pistacia Chinensis FH-pteroceltis tatarinowii. FH -Acer huergerianus FH-pittospo-rum truncatum.FH being stable state is one of dominant species in these types.FH is threatened by antyropogenic damage and the invasion of other trees during natural succession.measures of keeping FH were snldied in the endthis papor.