广东长潭省级自然保护区次生针阔混交林群落优势种群结构特征研究

基于UTM公里网格方法划分的66个网格,分析了长潭自然保护区次生针阔混交群落优势种群的结构特征,结果表明：（1）6600 m^2的次生针阔混交群落共计6 081株活立木,隶属于135种乔木树种,其中以杉木、马尾松、木荷、千年桐、山乌桕、毛竹、黄樟、藜蒴、青皮竹、枫香、罗浮柿、石栎等12种为优势树种。（2）12种优势树种的径级结构呈3种类型。木荷、枫香、千年桐、黄樟、藜蒴、罗浮柿和石栎等径级分布呈＂L＂增长型种群;杉木和马尾松因受人为种植和采伐影响,Ⅰ、Ⅱ、Ⅲ级数量丰富,Ⅳ级数量迅速减少;而毛竹和青皮竹则受人为挖取竹笋的影响,Ⅰ级数量较少。（3）除山乌桕Ⅳ级为随机分布外,其他11种优势种均为群集分布,群集程度随径级增加,变化趋势不明显,反映了人为干扰成为影响长潭自然保护区次生针阔混交群落优势种群结构特征的重要因子。

Structure Patterns of Dominant Populations in the Secondary Conifer and Broadleaf Mixed Forest in Jiaoling Changtan Provincial Natural Reserve

The digitized topographic map of the study area was superimposed with a grid system of 1 km × 1 km.So there were 66 grid squares in Jiaoling Changtan Provincial Natural Reserve.Structure patterns of dominant populations in the secondary conifer and broadleaf mixed forest were studied,the results showed that：（1）There were 6 081 trees in the 6 600 m2 fields,which belongs to 135 species,and 12 main species are Cunninghamia lanceolata,Pinus massoniana,Schima superba,Aleurites montana,Sapium discolor,Phyllostachys heterocycla,Cinnamomum porrectum,Castanopsis fissa,Bambusa textiles,Liquidambar formosana,Diospyros morrisiana,Lithocarpus glabra,etc.（2） The size structure of Schima superba,Liquidambar formosana,Aleurites montana,Cinnamomum porrectum,Castanopsis fissa,Diospyros morrisiana and Lithocarpus glabra were L increasing type,Cunninghamia lanceolata,Pinus massoniana were abounds in Ⅰ、Ⅱ、Ⅲ and were reduction in Ⅳ due to human plantation and harvest,but Phyllostachys heterocycla and Bambusa textiles is little in the Ⅰ due to Bamboo shoots were harvest by human.（3）Beside Sapium discolor was random distribution,the other 11 species were cluster distribution that was increasing with size,the changing is unremarkable,so the human activity is the dominate impact factor of structure patterns of dominant populations in the secondary conifer and broadleaf mixed forest in Jiaoling Changtan Provincial Natural Reserve.