学术
青藏高原高寒湿地生态系统CO2通量
张法伟[1,2] 刘安花[1,2] 李英年[1] 赵亮[1] 王勤学[3] 杜明远[4]
[1]中国科学院西北高原生物研究所,西宁810001 [2]中国科学院研究生院,北京100049 [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
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 g CO2·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。[著者文摘]
文章出处:
《生态学报》-2008年28卷2期 -453-462页
文献标识码:
A
文章编号:
1000-0933（2008）02-0453-10
CO2 flux in alpine wetland ecosystem on the Qinghai-Tibetan Plateau
ZHANG Fa-Wei, LIU An-Hua, LI Ying-Nian , ZHAO Liang , WANG Qin-Xue, DU Ming-Yuan（1 Northwest Institute of Plateau Biology, CAS, Xining 810001, China;2 Graduate University of Chinese Academy of Science, Beijing 100049, China;3 National Institute for Environmental Studies, Tsukuba 3050053, Japan ;4National Institute of Agro-environmental Sciences, Tsukuba 3058604, Japan）
Abstract:
Using the CO2 flux data obtained by the eddy covariance method in the northeast of the Qinghai-Tibetan Plateau in 2005, we analyzed the carbon dynamics in relation to the meteorological factors. The results showed that the alpine wetland ecosystem was a carbon source, and emitted 316.02gCO2·m^-2 to the 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 CO2uptake 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 showed a negative linear correlation with aboveground biomass, while a positive correlation existed between the ecosystem respiration （Res）and those factors.[著者文摘]
Key words:
alpine wetland ; CO2flux ; eddy covariance methods ; Qinghai-Tibetan Plateau
基金资助:
中国科学院知识创新工程重大资助项目（KZCX1-SW-01-01A）;国家重点基础研究发展规划资助项目（2002CB412501）;中日合作“亚太地区环境创新战略计划资助项目（APEIS）”
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