长沙市郊4种人工林林下植被多样性研究

为了探讨长沙市郊4种人工林林下植被的物种多样性，笔者选取丰富度、多样性、均匀度指标，对该地区的林下植被多样性进行分析研究。结果表明：4种林分灌木层的Margalef丰富度指数的变化趋势为：枫香林>樟树林>杉木林>湿地松林，杉木林中多样性指数最小；均匀度指数为：湿地松林>樟树林>枫香林>杉木林。草本层的多样性指数和丰富度指数的变化趋势均为：樟树林>杉木林>枫香林>湿地松林，均匀度指数在湿地松林中最小，与生态优势度相反。灌木层的物种丰富度和多样性指数基本高于草本层，除湿地松林外，均匀度指数为草本层>灌木层，杉木林生态优势度表现为灌木层>草本层，其他3种林分相反。

Study on the Undergrowth Vegetation Diversity of Four Planted Forests in Changsha Suburb

In order to investigate the species diversity of 4 different planted forests in the suburbs of Changsha, the author selected the richness, diversity, dominance index to analyze and study the species diversity of the region. The results showed that Margalef abundance index of shrub layer was： Liquidambar formosana Cinnamomum camphoraCunninghamia lanceolataPinus elliottii. The diversity index in Cunninghamia lanceolata was minimum. The tend of evenness index was Pinus elliottiiCinnamomum camphoraLiquidambar formosanaCunninghamia lanceolata. The richness and diversity index of herb layer was Cinnamomum camphoraCunninghamia lanceolataLiquidambar formosanaPinus elliottii. The evenness index in Pinus elliottii was minimum, which was opposite to ecological dominance. Richness and diversity index in shrub layer were higher than the herb layer. The evenness index was herb layershrub layer, except Pinus elliottii. Ecological dominance in Cunninghamia lanceolata was shrub layerherb layer, which was opposite to the other forest.