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青藏高原高寒湿地生态系统CO2通量
引用本文:张法伟,刘安花,李英年,赵亮,王勤学,杜明远.青藏高原高寒湿地生态系统CO2通量[J].生态学报,2008,28(2):453-462.
作者姓名:张法伟  刘安花  李英年  赵亮  王勤学  杜明远
作者单位:1. 中国科学院西北高原生物研究所,西宁,810001;中国科学院研究生院,北京,100049
2. 中国科学院西北高原生物研究所,西宁,810001
3. 日本国立环境研究所,日本,筑波,3050053
4. 日本农业环境技术研究所,日本,筑波,3058604
基金项目:中国科学院知识创新工程项目 , 国家重点基础研究发展计划(973计划) , 中日合作亚太地区环境创新战略计划(APEIS)
摘    要:依据涡度相关系统连续观测的2005年CO2通量数据,对青藏高原东北隅的高寒湿地生态系统源/汇功能及其部分环境影响因素进行了分析.结果表明,高寒湿地生态系统为明显的碳源,在植物生长季(5~9月份)吸收230.16 gCO2·m-2,非生长季(1~4月份及10~12月份)释放546.18 gCO2·m-2,其中净排放最高在5月份,为181.49 gCO2·m-2,净吸收最高在8月份,为189.69 gCO2·m-2,年释放量为316.02 gCO2·m-2.在平均日变化中,最大吸收值出现在7月份12:00,为(0.45±0.0012) mgCO2·m-2·s-1,最大排放速率出现在8月份0:00,为(0.22±0.0090) mgCO2·m-2·s-1.生长季中6~9月份表现为明显的单峰型日变化,非生长季的变化幅度较小.净生态系统交换量(NEE)和生态系统总初级生产力(GPP)与气温、空气水气饱和亏和地表反射率等环境因素呈现相似的相关性,与地上生物量和群落叶面积指数则为线性负相关,生态系统呼吸(Res)则与上述因子的相关性呈现相反的趋势.

关 键 词:青藏高原  高寒湿地  涡度相关  CO2通量  青藏  高原高寒  湿地生态系统  通量  Plateau  wetland  ecosystem  趋势  因子  生态系统呼吸  线性负相关  叶面积指数  地上生物量  相关性  相似  环境因素  地表反射率  空气  气温  初级生产力  交换量
文章编号:1000-0933(2008)02-0453-10
收稿时间:2006-11-15
修稿时间:2007-02-01

CO2 flux in alpine wetland ecosystem on the Qinghai-Tibetan Plateau, China
ZHANG Fa-Wei,LIU An-Hua,LI Ying-Nian,ZHAO Liang,WANG Qin-Xue,DU Ming-Yuan.CO2 flux in alpine wetland ecosystem on the Qinghai-Tibetan Plateau, China[J].Acta Ecologica Sinica,2008,28(2):453-462.
Authors:ZHANG Fa-Wei  LIU An-Hua  LI Ying-Nian  ZHAO Liang  WANG Qin-Xue  DU Ming-Yuan
Abstract:Using the CO2 flux data measured by the eddy covariance method in the northeast of Qinghai-Tibetan Plateau in 2005, we analyzed the carbon flux dynamics in relation to meteorological and biotic factors. The results showed that the alpine wetland ecosystem was the carbon source, and it emitted 316.02 gCO2 · m?2 to atmosphere in 2005 with 230.16 gCO2 · m?2 absorbed in the growing season from May to September and 546.18 gCO2 · m?2 released in the non-growing season from January to April and from October to December. The maximum of the averaged daily CO2 uptake rates and release rates was (0.45 ± 0.0012) mgCO2 · m?2 · s?1 (Mean ± SE) in July and (0.22 ± 0.0090) mgCO2 · m?2 · s?1 in August, respectively. The averaged diurnal variation showed a single-peaked pattern in the growing season, but exhibited very small fluctuation in the non-growing season. Net ecosystem exchange (NEE) and gross primary production (GPP) were all correlated with some meteorological factors, and they showed a negatively linear correlation with aboveground biomass, while a positive correlation existed between the ecosystem respiration (Res) and those factors.
Keywords:alpine wetland  CO2flux  eddy covariance methods  Qinghai-Tibetan Plateau
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