海南岛不同海拔高度青皮林天然更新特征

在基于不同海拔高度对青皮林群落的物种组成、结构及群落特征影响分析的基础上,进一步分析不同海拔高度对青皮林天然更新的影响,结果表明:青皮林二级幼树的群落组成、青皮重要值、群落多样性及更新数量与海拔高度的关系与成树有相同的规律;青皮一级幼树高度分布像径级分布一样也呈倒J曲线分布;根据成树和二级幼树重要值排序均为前10位的树种可筛选出天然更新能力及竞争能力均较强的树种的原则,青皮为天然更新能力和竞争能力极强的树种,此外,吊罗山高海拔地区的皱萼蒲桃、白榄、黄樟、海南冬青和岭南山竹子,三亚中海拔地区的光叶巴豆、线枝蒲桃、白树、琼榄、叶被木和岭南山竹子天然更新能力和竞争能力也较强。

Natural Regeneration Characteristics of Vatica mangachapoi at Different Altitudes in Hainan Island

Based on the analysis about the impacts of different altitudes on species composition,structure and community characteristics of Vatica mangachapoi community,the impacts of different altitudes on Vatica mangachapoi natural regeneration were further analyzed.The results showed that the relationships of species composition,Vatica mangachapoi important value,community diversity and regeneration quantities for second-class samplings(2.5cm≤DBH<5cm)with altitudes followed the same trends as trees(DBH≥5cm);tree height distributions for Vatica mangachapoi fist-class samplings(H≥33cm and DBH<2.5cm)were also an inverted J-curve distribution like diameter class distribution;species with stronger natural regeneration ability and competitiveness could be selected based on if the species important values for both trees(DBH≥5cm)and second-class samplings ranked on the top 10,of which Vatica mangachapoi was the species with the strongest natural regeneration ability and competitiveness.In addition,Syzygium rysopodum,Canarium album,Cinnamomum parthenoxylon,Ilex hainanensis and Garcinia oblongifolia in Mt.Diaoluo higher altitude area,and Croton laevigatus,Syzygium araiocladum,Suregada glomerulata,Gonocaryum maclurei,Phyllochlamys taxoides,Garcinia oblongifolia in Sanya medium altitude area were all the species with stronger natural regeneration ability and competitiveness.