五鹿山自然保护区白皮松群落物种组成与群落结构

The species composition and structural characteristics of Pinus bungeana community of Wulu Mountain nature reserve

以五鹿山国家自然保护区的白皮松群落为研究对象,通过典型样方调查,对其物种组成和群落结构进行了研究。结果表明:样地内植物共有32科45属61种,裸子植物2科2属3种,被子植物30科43属58种;从物种多度、平均胸径和重要值等指标来看,群落具有比较明显的优势种;群落垂直结构复杂,分为乔木层、灌木层和草本层,其中乔木层又可分为3个亚层;白皮松种群在每一个乔木亚层中都有出现,是该群落的优势种群;样地内所有树种的径级结构呈倒"J"形,几种优势种树种的径级结构可分为3种类型:倒"J"形、双峰形和倒"W"形。

The species composition and structural characteristics of Pinus bungeana community of National Forest Park of Wulu Mountain were studied by the sample-plot survey method. The results showed that 61 species belonging to 32 fami- lies and 45 genera were recorded in the plots. Among the 61 recorded species, 3 species are gymnosperms belonging to 2 families and 2 genera, 58 species were angiosperms belonging to 30 families and 43 genera. Data on species abun- dance, mean DBH and important value indicated that the dominant species were obvious within community. The commu- nities had a complex vertical structure and were divided into arbor layer, shrub layer and herb layer. The arbor layer could be divided into three sub-layers. The species group of Pinus bungeana were the dominant population in the com- munity, which appeared in each sub-layer. The size-class structure of all species in the plots generally conformed to a reverse ＂J＂ distribution. The size-class structure of several dominant species could be divided into three types： a reverse ＂J＂ distribution, bimodal distribution and a reverse ＂W＂ distribution.