火烧迹地萌芽更新林杉木种群结构与林下植物多样性研究

POPULATION STRUCTURE OF CUNNINGHAMIA LANCEOLATA AND UNDERSTORY DIVERSITY OF SPROUT REGENERATION FOREST IN BURNED AREA IN SUICHUAN COUNTY

采用样地调查法对江西省遂川县火烧迹地杉木萌芽更新林杉木种群和林下植物多样性进行了研究,结果表明:杉木种群的径级结构属于金字塔型,为增长型种群。杉木群落林下维管植物种类较少,有24科31属37种,木本植物为优势类群,占植物总种数的70.27%;群落林下植物属的区系成分复杂多样,具有明显的热带性质。灌木层的物种多样性指数较高,而草本层的物种多样性指数较低。总体来看,群落林下植物各层次的物种多样性均表现为:灌木层>草本层。该研究为杉木次生林的经营管理、自然植被的恢复和生物多样性保护等提供了理论依据。

Population structure of Cunninghamia lanceolata and understory diversity of sprout regeneration forest in burned area in Suichuan County were studied according to the statistics from 4 sample plots. The results show： the population structure of C lanceolata was of Pyrimid type, indicating that it is increasing type population. The plant species of understory vascular plants in C. lanceolata community （including varieties） are not abundant, there are 37 species （including varieties）, belonging to 24 families and 31 genera, the dominant plants are woody plant which accounted for 70.27% of the total species. The floristic geographical elements of genera in C lanceolata community are complex, diverse, and show obvious tropical zone characteristics. The species diversity index of shrub layer is large, but slightly low for herb layer except Pivlou index. Generally, the order of the magnitude of species diversity was： shrub layer〉herb layer. The research provides theoretical basis for managing C lanceolata secondary forest, restoring natural vegetation and protecting biodiversity.