小陇山人工油松林径级结构及林下植物多样性研究

采用典型样方法获取样地数据,并根据径级分布、物种重要值、丰富度指数、多样性指数、均匀度指数对小陇山人工油松林进行分析。结果表明:油松林中小径级林木较多,缺乏大径级林木;林下更新物种丰富,共包含47个科98个属112种;Gleason丰富度指数随着林龄和郁闭度增加而减小,且从阴坡向阳坡逐渐升高;多样性指数Simpson与Shannon-Wiener变化趋势基本一致,与Pielou均匀度指数一样,随林龄的增加而增大,且多样性指数随着郁闭度的增加而减小,从阴坡向阳坡逐渐升高,而均匀度指数受郁闭度和坡向的影响较小。小陇山人工油松林群落总体更新良好。

Diameter-class Structure and Understory Diversity of Pinus tabulaeformis Plantations in Xiaolong Mountain

Representative sampling method was adopted to collect data from sampling plots.Stands of Pinus tabulaeformis were investigated from the aspects of distribution of diameter class,species importance value,richness index,diversity index,and evenness.The results showed that dominant trees were those in small and medium size,lack of large diameter ones.Species in regeneration layer were abundant,including totally 47 families,98 generas,and 112 species.The Gleason index decreased with the increase of the age of the stand and canopy density,moreover,it increased gradually from shady to sunny slopes.The trends of Simpson diversity index and Shannon-Wiener diversity index exhibited basically the same trends as Gleason index.The evenness of Pielou index slightly increased with the increase of the age of the stand but was less affected by canopy density and slope aspect.Generally,P.tabulaeformis plantations are overall well-developed.