滇南勐宋热带山地雨林木质藤本多样性研究

Liana diversity and abundance of a tropical montane rainforest in Mengsong, Southern Yunnan, China

关键词:  木质藤本  多样性  热带山地雨林

Key words:  liana  diversity  tropical montane rainforest

摘要:

调查滇南勐宋山地雨林沟谷与坡地两种生境中木质藤本种的丰富度、径级分布、攀缘方式以及样地中被藤本缠绕的树木(dbh≥5 cm)的数量和比率。结果表明:沟谷与坡地胸径≥1 cm的木质藤本平均密度分别为95.7株/0.1 hm²、57株/0.1 hm²。调查样地内木质藤本共64种,隶属30个科。茎缠绕是最主要的攀缘方式,占总个体数的57%,卷须缠绕种所占比重最小,仅占3%; 沟谷与坡地所调查树木被木质藤本缠绕的比例分别为43.7%和28.6%。与亚洲其它热带地区森林相比,勐宋地区藤本的多样性低,但是木质藤本的密度相当高,并且在一些样地中出现了大型木质藤本,这些可能与该地区森林的演替状态有关。

Abstract:

Species richness, abundance, size-class distribution, climbing mode and the percentage of trees(DBH≥5 cm)infested by lianas were investigated in valley and ridge plots in a tropical montane rain forest in Mengsong,southern Yunnan. A total of 64 liana species representing 30 families were recorded. There were averages of 95.7 and 57 lianas with dbh≥1 cm in the valley and in the ridge per 0.1 hm²,respectively. A greater proportion of lianas was twiners(57% of density)while 3% of all were tendril climbers,reflecting the late successional stage of the forest. Approximately 43.7% and 28.6% of trees(dbh≥5 cm)were liana-infested in the valley and ridge plots. Compared to other tropical Asian tropical forests,the density of lianas in Mengsong are very high though the diversity of species is relatively low. There are also some huge lianas in some plots,which is the most conspicuous characteristics of a mature tropical rain forest.