湖南平江石牛寨地质公园丹霞地貌植物研究

A Floral Study of Danxia Landform in Shiniuzhai,Pingjiang County Hunan Province

于2008年对湖南省平江县石牛寨地质公园及其周边地区植被状况和丹霞地貌植物资源进行了实地调查,结果表明:该地有野生种子植物136科422属687种(含变种),并且分布有2种湖南新记录种,即白鹃梅Exochorda racemosa和轮叶过路黄Lysimachiaklattiana.在科、属水平上对植物区系特性进行了统计分析,从科的分布区类型来看,热带性强于温带性;从属的分布区类型来看,以泛热带属的比例最高(22.22%),其次为北温带分布属(17.99%)、东亚分布属(16.93%).石牛寨地质公园植物区系具有热带性较强、旱生植物和藤本植物丰富等特征,这与该地丹霞地貌的地质特征有关.

Two species, namely Exochorda racemosa and Lysimachia klattiana, are reported as new records to Hunan Province based on a research on the seed plants of Shiniuzhai and its surrounding Danxia landform area, where there are 687 species （including some varieties ） of wild seed plants belonging to 422 genera and 136 families. The statistics and results obtained from their intensive analyses at different levels are given in this paper, which show, from a view of their genera distribution pattern, that the main geographical elements are Pantropic （22. 22%）, North Temperate （17.99%） and E. Asia （16.93%）; and that the flora of Shiniuzhai takes its characteristics of a strong tropical nature, vigorous xerophytes and liana, thus affected by the Danxia landform.