梅县典型针阔混交林林分直径结构的动态变化规律  

Diameter distribution and dynamics of typical coniferous and broadleaved mixed forests in Meizhou county, Guangdong province

作　　者：肖智慧 李志洪 薛春泉 刘凯昌 罗勇 

机构地区：[1]广东省林业调查规划院,广东广州510520

出　　处：《中南林业科技大学学报》2013年第6期17-21,共5页Journal of Central South University of Forestry & Technology

基　　金：国家森林资源与生态状况综合监测广东试点;国家林业局林业碳汇计量监测体系建设广东试点;广东省低碳发展专项资金项目"广东省森林碳汇现状和潜力研究"(2011-032)

摘　　要：合理的林分结构是森林生态系统发挥其功能的基础,采用固定样地连续观测的方法对南亚热带典型针阔混交林进行调查,并利用Weibull概率密度函数,对固定样地内乔木树种5年(2007～2012年)的直径分布动态进行了分析。结果表明:研究地乔木层树种比较丰富,共出现22个树种,以红锥为主要优势种,其次为木荷、马尾松、湿地松和杉木。2012年的调查结果中,新出现的物种主要有鼠刺、黎蒴以及乌桕等。5年间,群落的径级结构没有明显的变化,林分中小径级的林木占多数,群落中幼树充足,自然更新良好,群落结构相对稳定。说明研究区域群落物种组成和大小结构比较稳定,群落处于动态平衡状态。各固定样地内直径分布曲线均呈左偏,红锥林和杉木林的峰度在两次调查中均呈现负值,表明实际分布比正态分布平坦。木荷林的峰度值在两次调查中均大于其他林分,其直径分布最为集中,且分布曲线最为陡峭。除红锥林的变动系数较大外,其余各样地直径分布的变动系数均在30%左右,各林分的变动系数在第二次调查中均略有增加。Weibull分布对以针叶树为主的马尾松林和杉木林的直径分布曲线拟合的效果较好,其中,对杉木林的直径分布拟合的效果最好,精度最高。而对以阔叶树为优势树种的红锥林和木荷林直径分布拟合效果不理想。Based on the fixed sample survey of each tree positioning data,the dynamics of diameter structure of coniferous and broadleaved mixed forest in subtropics of five-year-old（from the year of 2007 to 2012） were studied by using the probability density function of Weibull distribution.The results show that the tree composition of studied stands was abundant;there were 22 tree species in the community,Castanopsis hicklii was the main dominant tree species,which was flowed by Schima superba,Pinus massoniana,Pinus elliotii and Cunninghamia lanceolata.In addition,Itea chinensis,Castanopsis fissa and Sapium sebiferum were found in the community in the second investigation.The diameter size-class structure did not change a lot during the five years.Trees in small diameter class e dominated the community,indicating good regeneration across the stands,and the dynamics of tree diameter structure was relatively stable.The skew values of stands were positive in the two investigations.The species composition and diameter structure had small changes in the studied stands,and the community appeared to maintain a state of dynamic equilibrium.The skewness values of the stands dominated by Castanopsis hicklii and Cunninghamia lanceolata,respectively showed to be negative values,which indicating that the curves of diameter distribution of the two sites were flatter than normal distribution.In the two investigation,the kurtosis of Schima superba dominated forest were greater than the other stands,indicating that the species had the most concentrated diameter distribution and the most steep distribution curve.The diameter variance coefficients showed to be near 30%,except for a higher diameter variance coefficient of Castanopsis hicklii dominated forest.And the variance coefficients of the four stands from the second investigation were slightly greater than the investigation in 2007.It is found that the fitting effects of diameter distribution curves of P.massoniana and C.lanceolata dominated by coniferous trees with Weibull distrib

关 键 词：天然混交林 林分动态 直径分布 WEIBULL分布 梅州市 

分 类 号：S758.53[农业科学—森林经理学]