闽西乐东拟单性木兰天然林的种群结构与人工栽培研究

采用空间代时间和匀滑技术,通过编制种群静态生命表和生存分析,对福建省连城县乐东拟单性木兰的种群结构进行了分析,并对人工林栽培效果进行了调查,结果表明:乐东拟单性木兰种群年龄结构似金字塔形,Ⅰ级、Ⅱ级数量较多,在Ⅲ级、Ⅳ级种群出现断层,种群存活率曲线属于DeeveyⅢ型,在整个生命过程中,共出现3次死亡高峰,第Ⅱ级、Ⅳ级、Ⅶ级死亡率较高,种群在第Ⅰ级生存率较高而死亡率较低,进入第Ⅱ级之后,生存率急剧降低,累积死亡率急剧升高;11年生东拟单性木兰与杉木生长无显著差异,但在后期的培育过程中,应对杉木进行适当修枝或疏伐,以促进东拟单性木兰的生长。

Population Structure of Parakmeria lotungensis Natural Forest and its Artificial Cultivation

Using the age class structure represented by DBH class and smooth technology,through the population static life table and survival analysis,population structure of Parakmerialotungensis in Liancheng County of Fujian Province were analyzed.Cultivation effects of the plantation were investigated.Result shows that age structure of P.lotungensis population like a pyramid,grade Ⅰ,gradeⅡ in larger quantities,in grade Ⅲ,grade Ⅳ populations oc-curs fault;the curve of survival rate of the population belongs to DeeveyⅢ type;throughout the life course,a total of death peak occurred three times;the mortality rate of grade Ⅱ,grade Ⅳ,grade Ⅶ are higher;the population at gradeⅠ higher survival rate and lower mortality rates,after entering the second level Ⅱ,drastically reduced the survival rate,cumulative mortality sharply increased;1 1-year-old Parakmeria lotungensiswith the growth of Chinese fir was no significant difference,but in the latter part of the nurturing process,the appropriate thinning or pruning response of Cunninghamia lanceolata should be conducted in order to promote growth of P.lotungensis.