基于重要值和Hegyi竞争指数濒危植物洪平杏伴生群落特征研究

Traits of concomitant community of endangered plant Armeniaca hongpingensis based on importance value and Hegyi competition index

洪平杏(Armeniaca hongpingensis)是我国特有的濒危植物,仅分布于湖北省神农架地区,了解其伴生群落特征对洪平杏的保护具有重要意义.通过野外调查,分析洪平杏伴生群落物种组成,乔灌层物种多样性、垂直成层及个体径级结构,乔灌层植物的重要值及洪平杏竞争指数.结果表明:样地中群落物种丰富,共有植物91种,隶属45科82属,群落垂直分层明显,群落中有乔木17种,灌木14种.在所调查的伴生群落中,洪平杏的重要值均较高,为群落中的优势种或亚优势种;从Hegyi竞争指数看,洪平杏所受竞争压力较低,以种间竞争为主,主要种间竞争木为胡桃(Juglans regia)和落叶松(Larix gmelinii).因此,根据实际情况,对竞争木进行剪枝或砍伐,可对洪平杏保护起到一定作用.

Armeniaca hongpingensis is an endangered tree species plant with a narrow distribution in the Shennongjia,Hubei Province.It is of great practical significance for the conservation of Armeniaca hongpingensis through researching on the traits of its concomitant community.In this study,we investigated species composition of Armeniaca hongpingensis concomitant communities,vertical stratification and plant diameter class,species diversity and the importance value in tree and shrub layers,and the competition index of Armeniaca hongpingensis.The results showed that the four investigated concomitant communities around Armeniaca hongpingensis contained a total of 91 species belonging to 45 families and 82 genera.Among them,there were 17 species and 14 species were in tree and shrub layers,respectively.Armeniaca hongpingensis had a higher importance value,and was dominant species or sub-dominant species in the investigated concomitant communities.Based on the Hegyi competition index,the target species Armeniaca hongpingensis was mainly subject to interspecific competition,but total competition intensity was lower.The main competitive trees were Juglans regia and Larix gmelini,pruning or felling of competitive trees should be an effective measures to protect Armeniaca hongpingensis.