国家濒危植物永瓣藤分布的土壤环境特征

Environmental characteristics of soils from the distributed of Monimopetalum chinense, an endangered plant in China

永瓣藤(Monimopetalum chinense)是卫矛科(Celastraceae)的一个中国特有单型属植物,被列为国家二级稀有濒危保护物种。本文对永瓣藤分布区14个样地土壤样品的pH值、有机质、全氮、水解氮、硝态氮、全磷、速效磷和全钾进行了检测分析,以期弄清该物种分布与土壤环境因子的关系。结果表明,其pH值的变化幅度为4.55～5.57,主要处于强酸性范围,适应幅度较窄。有机质与氮素非常丰富,相互间具有明显的相关性,有利于永瓣藤的生长与繁衍,但土壤中磷、钾素较为缺乏。土壤酸碱度和有机质的质量分数在某种程度上对永瓣藤的分布范围具有制约作用。

Monimopetalum chinense （Celastraccac）, a rare, endangered and protectod species, is a plant of monotypic and endemic genus in China. This paper deals with the pH, organic manure, total N, available N, Nitrate nitrogen （NO^-3 - N）, total P, available P and total K in 14 soil samples from the distributod area of M. chinense. The results show that the pH values are from 4.55 to 5.57, in a strong acid area, indicating a narrow adaptive range of the species. The soil samples contain plenty of organic matter and nitrogen, andh and reproduction of M. chinense. obvious correlates were found between them, which are good to the growt While the soil samples are short of P and K. This research also shows that pH and organic matter are two limiting factors for survival and multiply of M. chinense, as well as main environmental reasons that it is on the brink of extinction.