海南铜鼓岭国家级自然保护区植被数量分类与排序

Quantitative Classification and Ordination of Vegetations in Tongguling National Nature Reserve, Hainan

为了科学区分海南文昌铜鼓岭国家级自然保护区植被类型的组成群系,深入了解其群落特征与环境因子之间的相互关系,通过在保护区内全方位随机取样,共64个样地(取样总面积2.11 hm2),采用PC-ORD5.0进行双向指示种分析法(TWINSPAN)分类,除趋势对应分析(DCA)排序和典范对应分析(CCA)排序,用CANOCO 4.5软件完成。结果表明:(1)应用TWINSPAN分类和DCA排序将铜鼓岭自然保护区64个样地分为11个群系,隶属滨海灌丛、山麓灌木林、热带常绿季雨矮林3种植被类型;(2)64个样地在DCA排序轴第1轴呈现了水分梯度的变化,第2排序轴上呈现的环境意义不明显,表明水分因子对该保护区植被类型的形成与分布起着决定性作用;(3)铜鼓岭海拔不高,最高峰仅338 m,但CCA排序结果显示,对排序贡献由大到小依次为:海拔、坡度、坡向,第1排序轴与海拔相关性最大,第2排序轴与坡度有很大的相关性,充分表明沿海基岩海岸环境与森林植被分布的特殊性。

In order to scientifically distinguish the vegetation types of formation in Hainan Wenchang Tongguling National Nature Reserveand and to understand the relationship between community characteristics and environmental factors, the author conducted the analysis through comprehensive random sampling in the protection zone with a total of 64 sample plots （the total area sampled 2.1 1 hm2）, using PC-ORD5.0 for TWINSPAN classification and CANOCO 4.5 software for DCA and CCA ordination. The results showed： （1） by using TWINSPAN and DCA, 64 samples of Tongguling Nature Reserve were divided into 1 1 formations, under 3 kinds of vegetation types： coastal thickets, foothills shrubs, tropical evergreen monsoon elfin forest; （2） 64 sample plots in DCA sorting first axis showed the change of moisture gradient, and no obvious environment significance in the second shaft rendering, indicating that the moisture factor played a decisive role for the formation and distribution of vegetation types in the reserve; （3） elevation of T peak of only 338 m, however, CCA results showed that the contribution to the o ongguling rdering was not high with the from greatest to smallest was altitude, gradient and slope direction. The results suggested that the first axis and the altitude had the maximum relevance, the second sort shaft and slope had rather high relevance, fully demonstrating the particularity of coastal bedrock coast environment and that of the distribution of forest vegetation.