不同杉木林经营模式凋落物特征比较  

Litters Characteristic of Different Management Model in Cunninghamia Lanceolata Forest

作　　者：李俊宁 LI Junning(Xianyou Forest Bureau,Putian,Fujian 351200)

机构地区：[1]仙游林业局,福建莆田351200

出　　处：《武夷学院学报》2018年第9期22-26,共5页Journal of Wuyi University

摘　　要：对不同杉木林经营模式和天然常绿阔叶林的凋落物量、组成及动态变化特征进行了定位研究,分析比较了5种森林生态系统的凋落物特征。结果表明:不同森林生态系统年凋落量有明显的差异,从高到低依次为:天然常绿阔叶林>2代杉木萌芽林>杉木老龄林>1991年2代杉木人工林>1993年2代杉木人工林,杉木林凋落量每年为4.917 0～6.626 4 t·hm^(-2),低于天然常绿阔叶林的9.774 0 t·hm^(-2)。2代杉木萌芽林凋落大于杉木老龄林,与该杉木林中阔叶树凋落物较多有关,杉木老龄林及1991年2代杉木人工林、1993年2代杉木人工林凋落物随着林龄的增加而增加,但差异较小。在凋落物各组分中,落叶占各系统总凋落物量的比例最高(53%～74%),其次为枝和果;各群落凋落物总量呈现明显的月度变化,一年中大致均有两个凋落高峰期,即:4—6月和12月。常绿阔叶林凋落叶以阔叶类为主,杉木林中凋落叶则为阔叶、针叶并存。研究结果可为杉木主伐年龄确定、混交林经营提供理论依据。In this paper, Cunninghamia lanceolata forest of different management model and natural broad-leaved evergreen forest lit-ter content, composition and dynamic characteristics are in the long-term locate studies, comparing and analyzing five kinds of systematic litter laws. The results indicate that there are differences amount of mean annual total litterfall in the different forest ecosystem, from high to low are natural broad-leaved evergreen forest 〉 second-generation sprout natural regeneration 〉 old-growth Cunninghamia lanceolata forest 〉 second-generation Cunninghamia larzceolata plantation in 1991 〉 second-generation Cunninghamia larzceolata plantation in 1993; annual litter content of Cunninghamia lance olata forest was 4.917-6.6264 t·hm^-2 which was lower than that of natural broad-leaved ever-green forest （9.7740 t·hm^-2） . For each component of litters in each ecosystem, leaves were the biggest part （53%-74%） , followed by branch and fi＇uit. Total litter content in each ecosystem showed significantly seasonal change and roughly all have two litter peak （April June and December） . Broad leaf was the main kind of leaf litter in the natural board-leaved forest while broad and conifer leaf also took great proportion in the Cunninghamia lanceolata plantation.

关 键 词：杉木林 天然常绿阔叶林 凋落物量 凋落物组成 月度变化 

分 类 号：S718.55[农业科学—林学]