广东化州林尘卜岭风水林群落分析

Analysis of Fengshui Forest Community in Buling Village,Linchen Town,Huazhou City,Guangdong Province

对热带北缘低丘台地保护了40年的广东化州卜岭风水林进行了群落特征研究,结果表明:群落组成种类复杂,1200 m 2样带内有维管束植物36科54属70种,种子植物属以热带亚热带区系成分为主;群落结构较复杂,分层现象不明显,冠层树冠不连续,DBH≥20 cm的大径级个体约占胸径5 cm以上个体数的16.67%,群落胸高断面积为37.42 m 2/hm^(2);频度分析表明,该群落超过50%的种类多度分布较均匀;群落生物多样性分析表明,该群落的各层次生物多样性指数为灌木层>乔木层>草本层,乔木层和灌木层的多样性指数均达到4.00以上,具有较高的多样性水平;群落上层优势种的种群结构分析表明,除人工种植的外来种窿缘桉属于衰退群落外,其他优势种群大都属进展种群,群落仍处于向地带性森林的进展演替中。

This paper studied the community characteristics of the Fengshui forest in Buling,Huazhou,Guangdong,which has been protected for 40 years on the low hilly platform on the northern edge of the tropics.The results showed that the composition of the community was complex.There were 70 species of vascular plants in 36 families,54 genera and vascular plants in the 1200 square meter transect.The seed plants were mainly composed of tropical and subtropical flora.The community structure was more complex,the stratification was not obvious,the canopy was discontinuous,and the large-diameter individuals with DBH≥20 cm account for about 16.67%of individuals with a DBH greater than 5 cm one,the community’s breast height cross-sectional area was 37.42 m 2/hm^(2).Frequency analysis showed that more than half of this community’s species abundance was more evenly distributed.Community biodiversity analysis showed that the diversity index of each level of this community was shrub layer>tree layer>herb layer.The diversity index of tree layer and shrub layer was above 4.00,which had a high diversity level.The population structure analysis of the dominant species in the upper layer of the community showed that,except for the artificially planted Eucalyptus exserta belongs to the decline community,the other dominant populations were mostly advanced populations,and the communities were still in the progressive succession towards zonal forests.