青藏高原高寒湿地生态系统CO_2通量
CO2 flux in alpine wetland ecosystem on the Qinghai-Tibetan Plateau
查看参考文献22篇
文摘
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依据涡度相关系统连续观测的2005年CO_2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 gCO_2·m~(-2),非生长季(1-4月份及10-12月份)释放546.18 gCO_2·m~(-2),其中净排放最高在5月份,为181.49 gCO_2·m~(-2),净吸收最高在8月份,为189.69 g CO_2·m~(-2),年释放量为316.02 gCO_2·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)mgCO_2·m~(-2)·s~(-1),最大排放速率出现在8月份0:00,为(0.22±0.0090)mgCO_2·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。 |
其他语种文摘
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Using the CO_2 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 316.02gCO_2·m~(-2) to the atmosphere in 2005 with 230.16 gCO_2·m~(-2) absorbed in the growing season from May to September and 546. 18 gCO_2·m~(-2) released in the non-growing season from January to April and from October to December. The maximum of the averaged daily CO_2uptake rates and release rates was (0.45 +0.0012) mgCO_2·m~(-2)·s~(-1)(Mean SE) in July, and (0.22 +0. 0090) mgCO_2·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. |
来源
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生态学报
,2008,28(2):453-462 【核心库】
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关键词
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青藏高原
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高寒湿地
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涡度相关
;
CO2通量
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地址
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1.
中国科学院西北高原生物研究所, 青海, 西宁, 810001
2.
日本国立环境研究所, 日本
3.
日本农业环境技术研究所, 日本
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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1000-0933 |
学科
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普通生物学;环境科学基础理论 |
基金
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中国科学院知识创新工程重大项目
;
国家973计划
;
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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文献收藏号
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CSCD:3225100
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