甘肃莲花山主要森林群落空间格局的分形特征——关联维数

关联维数可用以揭示森林群落个体空间关联的尺度变化规律、个体空间关联程度及个体关联的尺度变化差异。基于7个样地调查数据,应用关联维数对甘肃省莲花山国家级自然保护区主要森林群落类型中建群种和优势种的空间格局进行了测度分析。结果表明:各群系的群落格局具有较高的关联维数(接近2),个体空间关联程度较高,由离至低依次为:云杉-紫果云杉-糙皮桦林(Q2)1．794 4>岷江冷杉-糙皮桦-白棒林(Q4)1.779 8>辽东栎林(Q5) 1.744 2>岷江冷杉林(Q3)1．699 2>岷江冷杉人工林(Q1)1.665 6>华山松林(Q5)1.640 4>紫果云杉-云杉-岷江冷杉林(Q7)1.634 2。

Fractal properties of the spatial pattern of different forest communities in the Lianhua Mountain of Gansu Province--correlation dimension

Based on data of seven sample plots,the fractal properties of individuals spatial patterns of the constructive and dominant species in several major forest communities in the Lianhua Mountains.as a national nature reserve located in the central Gansu Province, were detected and analyzed in accordance with correlation dimensions. The results showed that the relevant spatial pattern of every forest formations were displayed by quite high correlation dimensions (near to 2 ),spatial autocorrelation among individuals was significant,and competition among individuals was serious. The order of spatial autocorrelation of these communities was followed as Picea asperata-Picea purpurea forest(Q2)1, 794 4 > Abies faxo niana-Betula utilis-Betula platyphylla forest(Q4)1. 779 8>Quercus liaotungensis forest(Q6)1. 744 2 >Abies faxoniana forest(Q3)1. 699 2>Abies faxonianaplantation(Q1) 1, 665 6>Pinus armandi forest (Q5)1, 640 4> Picea purpurea-Picea asperata-Abies faxoniana forest(Q7)1. 634 2. it indicated that the correlation dimensions could be used to reveal scaling properties and distinction of spatial autocorrelation and spatial correlation degree of individuals in different forest communities.