云南思茅翠云石灰岩山剑叶龙血树群落的研究

根据6个10m×10m样地的调查资料,对思茅翠云石灰岩山森林的群落学特征进行了分析研究,结果显示:(1)云南思茅翠云石灰岩山森林主要由常绿的剑叶龙血树形成单优群落,而群落内随乔木径级的增大,个体/种的数量逐渐减小。(2)该群落在600m2样地内,共计维管束植物123种,隶属于65科110属;其中乔木种类最为丰富,共有51种,隶属29科46属,而林下草本和层间藤本植物种类次之,灌木和附生植物种类较少。(3)群落主要以高位芽植物为主,其中又以中高位芽植物比例最大,占所统计总数的35.77%;在叶片生态学特征方面,群落以常绿(65.04%)、中叶(56.1%)和小叶(40.7%)、单叶(73.98%)、纸质(59.35%)、全缘(64.23%)、非尾尖(91.06%)为主。(4)该群落是一种基本上常绿或半常绿的森林群落,与经典的“季雨林”特征不符,应是一种滇南石灰岩山地上发育的特殊森林植被类型。

Study on the Dracaena cochinchinensis dominated forest on limestone in Cuiyun County, Simao, Southern Yunnan

Based on 6 sampling plots of 10 m by 10 m,the limestone forest in Cuiyun,Simao of southern Yunnan was studied. The following results were given:(1)The limestone forest is dominated by the evergreen tree species Dracaena cochinchinensis. (2)In the total 600 m~2 sampling area,123 vascular species of 110 genera of 65 families were recorded. (3)In life form spectrum,phanerophytes contributes to 76.4% of total species,of which mesophanerophytes makes up 35.77%,liana phanerophytes 21.14%. In leaf size spectrum,the forest is dominated by evergreen tree species with simple,mesophyllous leaves. (4)The forest,dominated by the evergreen tree species D.cochinchinensis,is not equivalent to classic monsoon forest in physiognomy,in spite of the fact that it is affected by seasonal dryness and contains a variable percentage of deciduous trees. It is considered to be a particular vegetation type on limestone in Southern Yunnan.