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中亚热带森林土壤呼吸日变化及其与土壤温湿度的关系
引用本文:龚斌,王风玉,张继平,沃笑,刘伟玲,齐月.中亚热带森林土壤呼吸日变化及其与土壤温湿度的关系[J].生态环境,2013(8):1275-1281.
作者姓名:龚斌  王风玉  张继平  沃笑  刘伟玲  齐月
作者单位:[1]中国环境科学研究院,北京100012 [2]国家环境保护区域生态过程与功能评估重点实验室,北京100012 [3]东华理工大学测绘工程学院,江西南昌330013
基金项目:中国环境科学研究院改革启动项目井冈山站生态基线调查与评估(2010GGQD12); 中亚热带杉木林不同年限砍伐迹地的土壤碳排放影响机制研究(gyk5031302); 国家环保部环保公益性行业科研专项项目(201109030)
摘    要:森林土壤呼吸是陆地生态系统土壤呼吸的重要组成部分,其动态变化对全球碳平衡有着重要的影响。目前对中亚热带森林土壤呼吸的研究还比较薄弱。本次研究采用Li-8100采集土壤呼吸速率,同时测定土壤0-10 cm土壤含水量和15 cm处的土壤温度。通过分析所测数据研究井冈山国家级自然保护区中亚热带森林生态系统主要森林类型生长季土壤呼吸速率的日变化特征,并分析土壤温湿度与土壤呼吸的相关关系。结果表明,①各个森林类型的土壤呼吸作用在白天比较活跃,夜晚波动很小。峰值一般出现在10:00到14:00之间。日土壤呼吸强度曲线基本遵循倒U型。②阔叶林(优势种:甜槠Castanopsis eyrei(Champ.)Tutch)、针叶林(优势种:台湾松Pinus taiwanensis)、混交林(优势种:银木荷Schima argenteaPritz.和杉木Cunninghamia lanceolata(Lamb.)Hook)和竹林(优势种:毛竹Phyllostachys heterocycla cv.Pubescens)的土壤呼吸范围依次为:2.1~5.3、2.19~4.02、1.27~4.23、1.8~6.35μmol·m-2·s-1。混交林的平均土壤呼吸值远小于其他三种林,但其土壤温度相对较低,土壤温湿度的浮动范围较小。竹林和阔叶林虽然土壤呼吸均值较高,但其浮动范围较大,受环境影响较大,土壤温湿度变化较低。③用Excel和Sigmaplot软件统计分析4种林型的土壤呼吸数据,研究结果表明,阔叶林土壤呼吸和土壤温度相关性不显著;针叶林林型土壤体积含水量为25.02%是影响土壤呼吸速率的分界点;混交林林型土壤呼吸和温度存在倒U关系,会随着土壤体积含水量升高而降低;竹林的土壤呼吸速率也随着土壤体积含水量的增加而降低。总而言之,可能由于降雨量过大造成土壤孔隙度变小,进而影响了土壤呼吸作用的活跃度导致各个森林类型的土壤呼吸作用与土壤温湿度的相关性不大。

关 键 词:中亚热带森林  土壤呼吸  土壤温度  土壤湿度  井冈山国家级自然保护区

Diurnal changes of soil respiration of mid-subtropical forest and its relationship with soil temperature and humidity
GONG Bin,WANG Fengyu,ZHANG Jiping.,WO Xiao,LIU Weiling,QI Yue.Diurnal changes of soil respiration of mid-subtropical forest and its relationship with soil temperature and humidity[J].Ecology and Environmnet,2013(8):1275-1281.
Authors:GONG Bin  WANG Fengyu  ZHANG Jiping  WO Xiao  LIU Weiling  QI Yue
Institution:1. Chinese Research Academy of Environmental Sciences, Beijing 100012, China; 2. State Environmental Protection Key Laboratory of Regional Ecological Processes and Functions Assessment, Beijing 100012, China; 3. East China Institute of Technology, Faculty of Geomatics, Nanchang 330012, China
Abstract:Forest soil respiration is an important part of soil respiration of the terrestrial ecosystems and the dynamic changes of forest soil respiration, which has great impact on the global carbon balance. Currently, the research of soil respiration of mid-subtropical forest is relatively weak. Taken the Jinggang Mountain National Nature Reserve as the study area, this paper monitored the soil respiration of main mid-subtropical forest types during the growing season using an infrared gas exchange analyzer (Li-8100), and analyzed its relationship with soil temperature and humidity. The results showed that: Osoil respiration of each forest type was high and active during the day, but low and inactive in the night. The most active period of soil respiration occurred between 10:00 to 14:00. The intensity curve of daily soil respiration followed the inverted U-shaped. (~)The soil respiration of the broad-leaved forests (dominant plant species: Castanopsis eyrei (Champ.)Tutch), coniferous forests (dominant species: Pinus taiwanensis), mixed forests (dominant plant species: Schima argentea Pritz. & Cunninghamia lanceolata (Lamb.) Hook) and bamboo forests (dominant plant species: Phyllostachys heterocycla cv. Pubescens) varied from 2.1-5.3, 2.19---4.02, 1.27---4.23 and 1.8-6.35 ~tmol'm-2's-1, respectively. The average soil respiration of the mixed forests was smaller than other kinds of forests, while its soil temperature was lower. Compared with the soil temperature & humidity of the broad-leaved forests and bamboo forests, the average soil respiration was higher. Also, the average soil respiration had a big floating range, and mainly affected by environmental factors. (~)Analysis of soil respiration data of the four forest types using Excel and Sigrnaplot statistical software, results showed that the soil respiration of broad-leaved forest did not correlate significantly with soil temperature; When the soil volumetric moisture content of coniferous forest was 25.02%, the soil respiration rate had a point of demarcation; there is an inverted U relationship between mixed forest soil respiration and temperature, and its respiration decreasesd as the soil volumetric moisture content increased; the relationship between bamboo forest Soil respiration rate and the soil volumetric moisture content was similar with the mixed forest. In a word, probably due to the smiller soil porosity caused by heavier rainfull, the soil respiration activity was affected, thereby the correlation between soil respiration and soil temperature, humidity was not obvious among all forest types.
Keywords:mid-subtropical forest  soil respiration  soil temperature  soil humidity  Jinggang Mountain National Nature Reserve
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