萌生杉木林空间结构特征研究

利用结构参数角尺度、大小比数、混交度对浙江龙泉萌生杉木林的空间结构进行分析,结果表明:林分的平均角尺度为0.512,林分空间格局为随机分布;杉木树种分布格局为团状分布,木荷树种整体分布格局为随机分布,其它树种的整体分布格局为均匀分布;林分的平均混交度为0.438 4,在弱度混交和中度混交之间;林分中树种以胸径作为比较指标的林木个体的优势排列顺序为:苦槠、马尾松> 杉木> 樟树> 木荷> 枫香、红豆树> 拟赤杨> 榆树。根据萌生杉木林的结构特征提出经营对策, 通过合理择伐和补植乡土树种进行林分结构调整,提高林分质量,优化林分空间结构,以便更好地发挥其功能。

Research on Spatial Structure of Cunninghamia lanceolata Coppice Forest

Taking Cunninghamia lanceolata coppice forest in Longquan County, Zhejiang Province as research object, the spatial structure of the forest were investigated and analyzed by using uniform angle index, neighborhood comparison and mingling degree. The results indicated that the stand uniform angle index was 0.512, the pattern of tree distribution was random, the pattern of tree distribution of the C. lanceolata was cluster distribution, the pattern of tree distribution of the Schima superba was randomm, the pattern of tree distribution of the other species was uniform. The stand average mingling degree was 0.438 4, being a weak mixed plantation to moderate mixed plantation. The neighborhood comparison order was Castanopsis sclerophylla, Pinus massoniana > Cunninghamia lanceolata > Cinnamomum camphora > Schima superba > Liquidambar formosana, Ormosia hosiei > Alniphyllum fortunei > Ulmus pumila. In order to improve plantation quality and paly its function better, this study aimed to provide scientific basis for guiding selective cutting management, replanting native tree species and spatial structure optimization of Cunninghamia lanceolata coppice forest.