宁夏野生甘草分布空间异质性及分布格局研究

Study on the spatial herterogeneity and distribution patterns of wild licorice in Ningxia

运用统计学中的半方差分析、分维分析和克里格插值方法对宁夏野生甘草Glycyrrhiza uralensis的分布格局及其过程进行了研究。结果表明,宁夏野生甘草不同尺度空间分布的异质性不十分强烈,在整个所有尺度上受简单过程控制。分布格局在较小尺度上受随机过程控制,而在较大尺度上受自相关关系影响较大。当甘草种群间的距离在0-58 m内,样点内甘草株数与距离有自相关关系,而当甘草种群间的距离大于58 m时,样点间甘草分布的变化失去了自相关关系。甘草的克隆繁殖方式和土壤质地的空间异质性及鼠兔危害是导致甘草分布空间异质性的重要原因。

The distributive patterns and processes of the wild licorice in Ningxia Hui Autonomous Region were studied by using semi-variogram, fractal dimension and Kriging in geo-statistics. The result indicated that the licorice in Ningxia does not show great herterogeneity at different scales. The distribution patterns at smaller scales were influenced by stochastic processes. Whereas that of larger scales showed a significantly autocorrelation. When the space between licorice clusters was within 0 to 58 m, the plant numbers showed an autocorrelation within the sample spot. But when the space was over 58 m, no such relation was found. The clone regeneration, spatial herterogeneity of the soil quality and the damage caused by rodents were the main contribution factors to the spatial herterogeneity of wild licorice.