青藏高原纳木错高寒草原温室气体通量及与环境因子关系研究

doi:10.11733/j.issn.1007-0435.2011.03.009

›› 2011, Vol. 19 ›› Issue (3): 412-419.DOI: 10.11733/j.issn.1007-0435.2011.03.009

青藏高原纳木错高寒草原温室气体通量及与环境因子关系研究

魏达^1,3, 旭日¹, 王迎红², 姚檀栋¹

1. 中国科学院青藏高原研究所, 北京, 100085;
2. 中国科学院研究生院, 北京, 100049;
3. 中国科学院大气物理研究所, 北京, 100029

收稿日期:2010-10-18 修回日期:2011-04-05 出版日期:2011-06-15 发布日期:2011-06-15
通讯作者: 旭日,E-mail:xu-ri@itpcas.ac.cn
作者简介:魏达(1985- ),男,河南安阳人,博士研究生,研究方向为高寒生态系统温室气体通量,E-mail:weida@itpcas.ac.cn
基金资助:
中国科学院青藏高原研究所前沿领域项目(40605032);自然科学基金项目(40975096)资助

CH₄,N₂O and CO₂ Fluxes and Correlation with Environmental Factors of Alpine Steppe Grassland in Nam Co Region of Tibetan Plateau

WEI Da^1,3, XU Ri¹, WANG Ying-hong², YAO Tan-dong¹

1. Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China;
2. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;
3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received:2010-10-18 Revised:2011-04-05 Online:2011-06-15 Published:2011-06-15

摘要/Abstract

摘要： 青藏高原广泛分布着以高寒草甸和高寒草原为主的陆地生态系统。由于高寒草地生态系统异质性较大,对高寒草地主要温室气体通量的估算具有较大的不确定性。为研究高寒草原温室气体通量规律及其驱动因子,并为动态碳-氮耦合模式在高寒生态系统的参数化与检验提供数据支持,于2008年7-9月,使用静态箱-气相色谱法在位于青藏高原腹地的纳木错高寒草原开展了主要温室气体通量(CO₂,CH₄,N₂O)及环境因子的同步观测。结果表明:纳木错高寒草原生态系统CH₄,N₂O通量和CO₂排放分别为:-0.047 mg·m^-2·h^-1,0.49μg·m^-2·h^-1和208.2 mg·m^-2·h^-1;在季节尺度上,土壤温度与CO₂排放呈显著正相关,与N₂O和CH₄通量线性关系不显著;土壤含水量与CH₄和N₂O通量呈正相关关系,但与CO₂通量无显著相关。在日变化尺度上,土壤湿度稳定,土壤温度变化与N₂O和CO₂通量成正相关,对CH₄通量影响不显著。

关键词: 高寒草原, 温室气体, 环境因子, 纳木错地区, 青藏高原

Abstract: The Tibetan Plateau is mostly covered by alpine meadow and alpine steppe.There were great uncertainties in greenhouse gases estimations for the alpine grasslands due to heterogeneity of terrestrial ecosystems.In order to verify dynamic carbon-nitrogen model,greenhouse gases fluxes and associated influencing factors were investigated.The seasonal and diurnal variations of soil CH₄,N₂O and CO₂ fluxes in an alpine steppe were measured using the static chamber and gas chromatograph method in Nam Co region of Tibetan Plateau from July to September of 2008.The mean flux rates were estimated to be-0.047 mg·m^-2·h^-1,0.49 μg·m^-2·h^-1 and 208.2 mg·m^-2·h^-1 for CH₄,N₂O and ecosystem respiration,respectively.Ecosystem respiration rates were positively correlated with soil temperature levels,whereas there were not significantly correlated with CH₄ and N₂O which are positively regulated by soil moisture variation.On the diurnal scale,the variation of temperature was positively correlated with N₂O and CO₂ fluxes,whereas there was not significant correlation with CH₄.

Key words: Alpine steppe, Greenhouse gases, Environmental factors, Nam Co region, Tibetan Plateau

中图分类号:

Q948.1

魏达, 旭日, 王迎红, 姚檀栋. 青藏高原纳木错高寒草原温室气体通量及与环境因子关系研究[J]. , 2011, 19(3): 412-419.

WEI Da, XU Ri, WANG Ying-hong, YAO Tan-dong. CH₄,N₂O and CO₂ Fluxes and Correlation with Environmental Factors of Alpine Steppe Grassland in Nam Co Region of Tibetan Plateau[J]. , 2011, 19(3): 412-419.

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青藏高原纳木错高寒草原温室气体通量及与环境因子关系研究

CH₄,N₂O and CO₂ Fluxes and Correlation with Environmental Factors of Alpine Steppe Grassland in Nam Co Region of Tibetan Plateau

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青藏高原纳木错高寒草原温室气体通量及与环境因子关系研究

CH4,N2O and CO2 Fluxes and Correlation with Environmental Factors of Alpine Steppe Grassland in Nam Co Region of Tibetan Plateau

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CH₄,N₂O and CO₂ Fluxes and Correlation with Environmental Factors of Alpine Steppe Grassland in Nam Co Region of Tibetan Plateau