中亚热带四种森林凋落物及碳氮贮量比较  

Litter biomass and its carbon and nitrogen storage in four subtropical forests in central Southern China

作　　者：路翔[1,2] 项文化[1,2] 任辉 彭长辉 

机构地区：[1]湖南会同杉木林生态系统国家野外科学观测研究站,会同438107 [2]中南林业科技大学生命科学与技术学院,长沙410004 [3]湖南省长沙县大山冲国有林场,长沙410142 [4]Institute of Environmental Sciences,University of Quebec at Montreal

出　　处：《生态学杂志》2012年第9期2234-2240,共7页Chinese Journal of Ecology

基　　金：国家林业局"948"项目(2010-4-03);湖南省"芙蓉学者计划"项目资助

摘　　要：在湖南省长沙县大山冲省级森林公园内,选择立地条件基本一致的4种森林类型为研究对象,于2011年12月(凋落物高峰期)对森林凋落物现存量及其碳、氮贮量进行调查。结果表明:4种森林凋落物现存量大小依次为青冈-石栎林(12.04±3.60)t·hm-2>马尾松-石栎林(11.65±2.15)t·hm-2>南酸枣林(9.12±2.30)t·hm-2>杉木林(8.92±1.80)t·hm-2;凋落叶在凋落物未分解层中所占比例最高,凋落果在4种林分中比例最小(<5%),凋落物各分解亚层现存量规律性不明显;4种森林凋落物C含量的变化范围为177.90～581.34g·kg-1,N含量的变化范围为5.18～15.48g·kg-1,C含量变化随凋落物分解程度的加深而下降,且变化极显著(P<0.0001);凋落物半分解层和已分解层现存量在总凋落物现存量中所占比例与C/N呈负相关;4种森林凋落物C贮量为3.37～5.69t·hm-2,N贮量为81.52～152.18kg·hm-2;马尾松-石栎针阔叶混交林由于凋落物分解较慢,凋落物现存量较大,林下凋落物层C、N贮量最高。Four subtropical forests with similar site conditions in the hilly area of Dashanchong Forest Park in central Hunan Province of China were selected to compare the existing litter biomass and its carbon （C） and nitrogen （N） storage. The litters were collected in the peak time of litterfall. Among the four forests, Cyclobalanopsis glauca-Lithocarpus glaber mixed forest had the highest litter biomass （12.04±3.60 t·hm-2）, followed by Pinus massonianaL. glaber mixed forest （11.65±2.15 t·hm-2）, Choerospondias axillaris forest （9.12±2.30 t·hm-2）, and Cunninghamia lanceolata plantation （8.92±1.80 t·hm-2）. In litter layer, leaf litter had the largest proportion, while fruit litter had the smallest one （〈5%）. No significant differences were observed in the amounts of the litters with different decomposition degrees. The C concentration of the litters in the four forests ranged from 177.90 to 581.34 g·kg-1, and the N concentration varied from 5.18 to 15.48 g·kg-1. The C concentration of the litters decreased significantly with their decomposition degree （P 〈0.0001）. The proportions of the semidecomposed litter and decomposed litter in the forests had a negative correlation with the litter C/N. The litter C storage in the four forests ranged from 3.37 to 5.69 t·hm-2, and the N storage varied from 81.52 to 152.18 kg·hm-2. Because of the low litter decomposition rate and high existing litter amount,P. massoniana-L. glaber mixed forest had the highest C and N storage in its litter layer.

关 键 词：杉木 马尾松 南酸枣 青冈 凋落物现存量 凋落物C/N 碳氮贮量 

分 类 号：S714[农业科学—林学]