海南岛加勒比松林林下植物区系与多样性特征

The Characteristics of Understory Plants Flora and Diversity of Pinus caribaea Plantation in Hainan Island

为了解海南岛加勒比松林林下植物多样性和植物区系特征,进一步解译加勒比松林生态系统,为经营管理提供科学依据,在岛内设置总面积为9500m2的样方。在对海南岛加勒比松林进行全面调查的基础上,研究该区域林下植物物种组成、地理成分及分析不同地形条件下的物种多样性分布特征。结果表明:(1)海南岛加勒比松林林下植物种类丰富,共调查记录到102科314属510种,其中蕨类植物共有12科18属39种、裸子植物有1科1属2种、被子植物有89科295属469种,优势科明显,优势属、种不明显;(2)加勒比松林林下植物地理联系广泛,热带性质明显,含少穗竹属、山黄麻属、半枫荷属3个特有属;(3)海南岛加勒比松林林下植物多样性受不同地形条件共同影响,在海拔为600m≤~<800m、坡度为10°≤~<20°、阳坡和半阳坡的条件下各物种多样性指数较高。

To understand the characteristics of understory plant diversity and flora in the inus caribaea plantation of Hainan Island and provide a scientific basis for further interpretation of the ecosystem and management of inus caribaea plantation,quadrats with a total area of 9500m?were instituted within Hainan Island.Ex-panding upon a comprehensive survey of inus caribaea plantation,the research focused on analyzing species composition,geographic composition,and the characteristics of understory species diversity and distribution according to different topographic factors in the designated areas.The survey indicated that:(1)the understory plant of inus caribaea Plantation in Hainan Island was rich in species diversity,composed of 102 families,314 genera,and 510 specie,which comprised 12 families,18 genera,and 39 species of ferns,1 family,1 genus,and 2 species of gymnosperms,and 89 families,295 genera,and 469 species of angiosperms(including 14 families,52 genera,and 73 species of monocots,and 75 families,243 genera,and 396 species of dicots).The dominant families were apparent,but the dominant genus and species were obscure;(2)The understory plant had extensive phytogeographic associations,with an obvious pattern of tropical distribution and containing 3 endemic genera Oligostachyum,Trema,and Semiliquidambar;(3)The understory plant diversity of the inus caribaea plantationwas jointly affected by different topographic factors,and the diversity index of each species was higher at altitude of 600m≤~<800m,the slope of 10°≤~<20°,and the sunny or the half-sunny slopes.