發(fā)布時(shí)間：2024-03-17 09:54

　　黃山松是中國(guó)特有樹種。為揭示黃山松天然林不同林齡徑級(jí)結(jié)構(gòu)與物種多樣性特征,在麻城市黃山松天然次生林選擇4個(gè)典型樣地開展調(diào)查,研究黃山松徑級(jí)結(jié)構(gòu)與林分密度、群落物種多樣性以及群落不同樣地物種多樣性相似性之間關(guān)系。結(jié)果表明:黃山松為群落優(yōu)勢(shì)種,在IV徑級(jí)時(shí),植株數(shù)量與全部植株比達(dá)到峰值,為19.46%;在VII徑級(jí)時(shí)該比值出現(xiàn)第二次峰值,為18.92%;群落內(nèi)維管植物156種,隸屬于71科130屬;林分平均密度最低時(shí)(1200 trees ha?1, DBH=36.779±4.444 cm),喬木層多樣性(H’=1.6716)和均勻度(E=0.6727)最高;在林分平均密度最高時(shí)(1525 trees ha?1,DBH=18.957±5.141cm),灌木層豐富度(Dma=5.4308)、多樣性(H’=2.9612)和均勻度最高(E=0.8985)。在林分密度為1325 trees ha?1時(shí),草本的豐富度(Dma=5.8132)、多樣性(H’=3.0697)和均勻度(E=0.9025)達(dá)到最大值。垂直結(jié)構(gòu)上α多樣性指數(shù)為:草本層>灌木層>喬木層;郁閉度增高會(huì)減弱群落林分內(nèi)光照...

【文章頁數(shù)】：9 頁

【文章目錄】：
1 Introduction
2 Research area and methods
    2.1 The general situation of research area
    2.2 Survey and sampling
    2.3 Diameter class
    2.4 Analysis of species diversity
    2.5 Similarities of species diversity
3 Results and analysis
    3.1 Diameter class structure
    3.2 Species composition under different forest densities
    3.3 Effects of forest density on species diversity
    3.4 Importance values at different forest densities
    3.5 Comparison and analysis of similarities of diversity
4 Discussion
    4.1 Diameter class structure and the forest succession trend
    4.2 Forest density and species composition
    4.3 Variations in the characteristics of species diversity
    4.4 Similarities of species diversity in the sample plots
5 Conclusions



本文編號(hào)：3930849