摘要
拟石斛(Oxystophyllum changjiangense)为海南岛特有的珍稀濒危附生兰科植物。为阐明其附生特性,笔者以分布于海南省霸王岭国家自然保护区的拟石斛为例,在系统调查其资源现状、生境特征及宿主种类的基础上,对其附生宿主的专一性、在宿主上的分布特点及附生个体数量与宿主胸径、树皮特性的相关性等进行分析。结果表明,86.6%的拟石斛个体分布在海拔800~1 000 m且主要附生在山地雨林中水源附近的高大乔木上;附生宿主18种,多见于木兰科、壳斗科、漆树科及梧桐科的植物;附生指数在0.32~0.94之间,其中白花含笑、长柄梭罗和红锥的附生指数接近于1;拟石斛全都分布在宿主的一级分支或二级分支处,二者差异性不显著;附生数量与宿主胸径呈显著性正相关(R=0.397,P<0.05),拟石斛对树皮特性选择具有偏好性。
Oxystophyllum changfiangense is a rare and endangered epiphytic orchid in Hainan Island. In order to explore its epiphytic characteristics, the epiphytic orchard O. changfiangense distributed in Bawangling National Nature Reserve was selected to study its preference to epiphytic hosts, distribution on the host, correlation between population size and DBH or bark texture of hosts based on an systematic investigation of its resource status, habitats and host species. The results showed that O. changjiangensewas were mainly growing on the tall arbor nearby the water resources in the montane rain forest, with 86.6% individuals found at 800 to 1 000 m above sea level. It was attached to 18 host species, most of which belonged to families Magnoliaceae, Fagaceae, Anacardiaceae, Sterculiaceae or Anacardiaceae. The selectivity index （SI） ranged from 0.32 to 0.94, of which the SI of Michelia mediocris, Reevesia longipetiolataand Castanopsis hystrixis was approximately equal to 1. The individuals of O. changiiangense were were all attached to the first or secondary branches of the host, without any significant difference in selectivity between the first and the secondary branches. The correlation between individual numbers and host DBH was significantly positive （ R = 0.397, P 〈 0.05 ）. The O. changfiangense has a preference for bark texture.
出处
《热带生物学报》
2017年第1期86-91,共6页
Journal of Tropical Biology
基金
国家自然基金(31460120)
国家农业公益性行业科研专项(201303117)
海南省应用技术研发与示范推广专项(ZDXM2015014)
