论文部分内容阅读
为研究北亚热带丘陵山区次生森林在不同演替序列中群落的空间结构特征,对江苏省南京市溧水林场区域内36块30 m×30 m样地中的木本植物分布进行了详细调查。在利用典范相关分析(CCA)确定不同演替阶段典型群落类型的基础上,运用点格局分析方法对各类型群落中优势树种的空间分布格局进行研究。结果表明:研究区典型森林群落类型为马尾松-麻栎群落、冬青-马尾松群落、麻栎-栓皮栎群落和杉木-油桐群落,土壤条件是影响该地区植物群落组成差异的首要因素。各群落类型中的优势乔木树种在>3 m的空间尺度上通常都表现为均匀分布格局,推断种内竞争可能是形成这种格局特征的重要原因。主要乔木树种之间的空间关联通常表现为中性关系,而对于麻栎-栓皮栎这种功能属性相近的树种,由于受到种间竞争驱动从而表现出显著的负相关。
In order to study the spatial structure of secondary forests in different successional series in northern subtropical hilly region, the distribution of woody plants in 36 30 m × 30 m plots in Lishui Forest Farm, Nanjing, Jiangsu Province was investigated in detail. Based on Canonical Correlation Analysis (CCA) to determine the typical community types in different succession stages, the spatial pattern of dominant tree species in different types of communities was studied by using point pattern analysis. The results showed that the typical forest community types were Pinus massoniana-Quercus variabilis community, Holly-massoniana community, Quercus acutissima-Quercus variabilis community and Cunninghamia lanceolata-tung tree community, and the soil conditions were the most important factors affecting the plant community composition in the study area. The dominant tree species in each community type usually show a uniform distribution pattern on the spatial scale> 3 m, suggesting that intra-species competition may be the important reason for the formation of this pattern. Spatial correlations among the main tree species usually show a neutral relationship, while trees with similar functional attributes, such as Quercus acutissima - Quercus variabilis, exhibit a significant negative correlation due to interspecific competition.