海南岛尖峰岭热带山地雨林土壤和凋落物呼吸研究  

Litter and soil respiration in a tropical mountain rain forest in Jianfengling,Hainan Island

作　　者：骆土寿[1] 陈步峰[1] 李意德[1] 林明献[1] 周光益[1] 陈德祥[1] 邱坚锐[1] 

机构地区：[1]中国林业科学研究院热带林业研究所,广州510520

出　　处：《生态学报》2001年第12期2013-2017,共5页Acta Ecologica Sinica

基　　金：国家自然科学基金 ( 39870 6 1 8);国家林业局重点项目 ( 2 0 0 1 -0 8);国际合作 (热带原始林保护示范区 ITTO PD1 4 / 92 Rev.2 )资助项目

摘　　要：采用 CI-30 1 PS红外 CO2 测定系统对海南岛尖峰岭热带山地雨林土壤和凋落物的呼吸进行测定结果表明 ,原始林土壤呼吸速率昼夜变化表现为多峰曲线 ,最高峰在 2 0 :0 0 ,在 1 2 :0 0和 4 :0 0～ 6 :0 0出现 2个次高峰 ,平均呼吸速率为1 0 .6 85 3μmol· m- 2· s- 1;更新林土壤呼吸速率变化大 ,平均为 1 4 .75 36 μmol· m- 2· s- 1,高峰主要在 1 3:0 0和 2 :0 0 ;凋落物分解过程在林地 CO2 排放总量中贡献很少 ,仅占 1 .74 1 %～ 2 .831 % ;原始林凋落物 CO2 排放量明显比更新林大 ,而各层的排放比例不一样 ,原始林是 b层 (半分解凋落物及腐殖质层 ) >a层 (未分解凋落物层 ) ,更新林是 b层 <a层 ;森林凋落物覆盖层对林地土壤 CO2 排放起到减缓的屏蔽作用 ;林地土壤呼吸与环境因子的关系较复杂 ,原始林土壤呼吸速率除与大气 CO2 浓度有关外 ,主要是时间节律影响 ,以及与气温变化有关 ,与大气湿度关系不明显 ;更新林地除与大气CO2 浓度和时间节律有关外 ,气温。Litter respiration and soil respiration were measured in a tropical mountain rain forest in Jianfengling,Hainan Island.The results were as follows:diurnal changes in soil respiration in virgin forest showed multi-peaks and the highest peak appeared at 8:00.Respiration and temperature of soil both reached lower peaks at 12:00 and during 4:00～6:00 respectively,with a mean respiratory rate of 10.7μmol·m -2·s -1.In regeneration forest,respiratory rates of soil reached peaks with a mean value of 14.8μmol·m -2·s -1,during 1 to 3 PM and varied significantly.Litter decomposing contributed only 1\^7%～2\^8% of the total CO 2-release in forestland and it differed in the different forests and soil layers:Virgin forest had a higher CO 2 releasing capacity than regeneration forest.Litter-fall reduced CO\-2-release as a shield.Soil respiration in forestland was highly correlated with the environmental factors such as atmospheric CO\-2,air temperature,But in the virgin forest,it was influenced mainly by time-course.In the regeneration forest,the air temperature and humidity had a greater effect on respiration.

关 键 词：热带山地雨林 土壤呼吸 调落物 CO2排放速率 CO2排放节律 森林 C循环 

分 类 号：S714[农业科学—林学] S718.554.2