---

作 者 ：张法伟,刘安花,李英年,赵亮,王勤学,杜明远

期 刊 ：生态学报 2008年 28卷 2期 页码：453~462

关键词：青藏高原；高寒湿地；涡度相关；CO2通量；

Keywords:alpine wetland, CO2 flux, eddy covariance methods, Qinghai-Tibetan Plateau,

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。

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 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 showed a negative linear correlation with aboveground biomass, while a positive correlation existed between the ecosystem respiration (Res）and those factors

---