论文部分内容阅读
采用Rényi多样性曲线对昆嵛山不同林分类型和不同立地特征所代表的林下灌草层多样性进行排序,评价其应用效果。结果表明,物种累计曲线分析显示实际采到的物种占全部物种数(估计值(ACE)=131.26)的92.9%,表明抽样充分。方差分析表明,除了不同林分类型的Shannon指数(F=4.665,p=0.002)和Simpson指数(F=2.465,p=0.044)有显著差异外,不同海拔、坡位、坡度以及土壤厚度的灌草多样性各个指标,如物种丰富度、Shannon多样性指数、Simpson多样性指数等均无显著差异。Rényi多样性曲线排序明确显示针叶树-杂木林和阔叶林林下灌草层多样性较其他5种林分类型(黑松林、赤松林、赤松-黑松混交林、日本落叶松/刺杉、针叶树-麻栎林)的高,而这5种林分的灌草层多样性曲线相互交错。从立地条件来看,低海拔(<200 m)、下坡位、缓坡(坡度0°～10°)的灌草多样性明显偏低;土壤厚度>5 cm和土壤厚度在1～3 cm的灌草多样性曲线处于其他3个土壤厚度梯度的下方。因此,Rényi多样性曲线在反映群落多样性指标方面更加直观。
The Rényi diversity curve was used to rank the diversity of understorey shrub and grass represented by different forest types and different site characteristics in Kunyu Mountain, and the application effect was evaluated. The results showed that the cumulative curve analysis showed that the species actually collected accounted for 92.9% of the total species (estimated value (ACE) = 131.26), indicating that the sampling was adequate. Variance analysis showed that, except for Shannon index (F = 4.665, p = 0.002) and Simpson index (F = 2.465, p = 0.044) There are no significant differences among the indexes of grass diversity, such as species richness, Shannon’s diversity index, Simpson’s diversity index. Rényi diversity curve clearly shows that the diversity of understory shrub layer in coniferous and mixed forest and broad-leaved forest is higher than that in the other five types of forest (black pine, red pine, red pine-black mixed forest, Japanese larch / Quercus forest) high, and these five kinds of forest shrub layer diversity curves intertwined. According to the site conditions, the diversity of shrubs at low altitude (<200 m), downhill and gentle slope (0 ° ~ 10 °) was significantly lower; the soil thickness> 5 cm and the soil thickness at 1 ~ 3 cm The shrub-grass diversity curve is below the other three soil thickness gradients. Therefore, the Rényi diversity curve is more intuitive in reflecting the indicators of community diversity.