岩溶山地植物群落不同层次物种丰富度的海拔垂直空间变异

Vertical Spatial Variability of Species Richness for Different Vegetation Types in Karst Mountains Area

为揭示岩溶山地植物群落不同层次物种丰富度垂直梯度的空间变异,应用地统计学对地处滇黔桂连片岩溶腹地,海拔垂直梯度变化范围广的贵州省毕节地区植物群落不同层次物种丰富度垂直梯度的空间变异进行分析。结果表明:乔木层物种丰富度的半变异函数最佳理论模型为球状模型,灌木层、草本层为线性有基台模型。乔木层物种丰富度的空间异质比为0.52%,具有强烈的垂直梯度空间相关性;灌木、草本层物种丰富度的空间异质比分别为314.70%、3 455.09%,垂直梯度的空间相关性很弱。乔木、灌木和草本层类型的变程分别为177.37m、73.02m和49.97m。灌木层、草本层物种丰富度的Moran’s I系数随海拔梯度变化的趋势相类似,但乔木层的差别较大。

To reveal altitudinal vertical spatial variability for different layers species richness of plant community in Karst mountains area, the variability were analyzed with geostatistics in Bijie region, Guizhou province,where is in the centre of Yunnan, Guizhou, Guangxi Karst area with large altitudinal variation. The results showed that optimal semivariogram theoretical model for arbor layer species richness is spherical model while shrub layer, herb layer are linear with sill model. The arbor layer species richness showed strong spatial relativity to vertical gradient. The rate of nugget to sill is 0.52%, the shrub layer, herb layer showed very weak spatial relativity to vertical gradient. The rate of nugget to sill are 314.70%, 3455.09% respectively. The range of arbor layer, shrub layer, herb layer are 177.37m,73.02m,49.97m. Moran＇ s I of species richness of shrub layer , herb layer and altitudinal variation showed similarity trends, but arbor layer was much different.