广西南亚热带不同林龄马尾松人工林林下植物区系研究

Study on Undergrowth Flora of Pinus massoniana Plantations with Four Different Forest Ages in Southern Subtropical Area of Guangxi, China

为揭示南亚热带马尾松人工林林下植被动态变化规律,通过样方法对广西4种不同林龄马尾松Pinus massoniana人工林林下植物进行区系分析,结果表明:(1)不同林龄马尾松人工林林下共记录到的128种植物分别隶属于58科93属,科的分布主要集中在单属科和小科,属的分布主要集中在小属和单种属;(2)林下植物区系均以热带成分为主;(3)通过不同林龄植物属区系结构示意图发现:热带成分>亚洲成分>温带成分>世界广布成分,且热带性质成分远多于其他的性质成分;(4)科与属的R/T值显示不同林龄马尾松人工林林下植物的科和属均为热带性质,且R/T值随着林龄的增加而减小。

In order to reveal the dynamic changes of undergrowth vegetation in Pinus massoniana plantations in southern subtropical area of Guangxi,the floristic analysis of P.massoniana plantations in four different forest ages in Guangxi were carried out by means of sample method.The results showed that:(1)A total of 128 plant species recorded under different forest ages of P.massoniana plantations belonged to 58 families and 93 genera.The main families are monogeneric family and small family.The major genuses are small genus and single genus,indicating that the community diversity is complex.(2)Undergrowth flora is dominated by tropical components.(3)Through the schematic diagrams of the faura structure of different age-dependent plant genus,it is found that the structure of the fauna is as follows:the tropical components>Asian components>temperate components>world widespread components and the tropical components are much more than the other components.(4)The R/T value showed that the families and genera of P.massoniana plantations in four different forest ages are of tropical nature,and the R/T value decreased with the increase of forest age.