天目山常绿阔叶林优势种群胸径的空间连续性分析

研究常绿阔叶林优势种群胸径的空间连续性以揭示常绿阔叶林的空间结构特征。在天日山国家级自然保护区内选择典型常绿问叶林设置100 m×100 m样地，用全站仪测定每株树木坐标，选择胸径在5 cm以上的乔木，用优势度分析法确定群落优势种群，并用GS＋软件进行空间统计分析。结果显示：样地整体结构比为0·7，平均空间连续性范围为5．7 m，表明天目山国家级自然保护区常绿阔叶林的优势树种林分胸径具有较高的空间相关性，但林分整体的空间连续性范围较小，这也体现了常绿阔叶林的结构复杂性。图2表3参15

Spatial continuity for DBH in dominant populations of an evergreen broadleaved forest in National Nature Reserve of Mount Tianmu,China

To reveal structural characteristics, a study on spatial continuity for DBH of dominant plant populations in an evergreen broadleaved forest was conducted. A typical plot, 100 m x 100 m, in National Nature Reserve of Mount Tianmu, Zhejiang was surveyed for tree diameter at breast height （DBH） above 5 cm with Total Station （Leica TCR702Xrange） that is used to measure tree coordinates. Also, dominant plant populations were first determined using the Dominance Index and then completed using a spatial statistical analysis with C,S ＋ software. Results showed that DBH of the dominant plant populations of evergreen broadleaved trees in the reserve had a spatial dependence of 0.7 and a range of spatial continuity of 5.7 m. Thus, the structural complexity for this evergreen broadleaved forest showed a high spatial dependence and a small range of spatial continuity. [Ch, 2 fig. 3 tab. 15 ref.]