长芒草草原群落种群空间格局的研究Ⅲ.集聚强度和规模及其生态成因分析 Fractal properties of the spatial pattern of Larix gmelini populationInformation dimension DISTRIBUTION PATTERN AND DYNAMICS OF PINUS ARMANDI POPULATION IN THE QINLING MOUNTAINS Spatial distribution pattern and fractal analysis of Larix chinensis populations in Qinling Mountain Information dimension fractal properties of the spatial pattern of Alsophila spinulosa population in Mopan‘‘‘‘gou,Fuling