草地学报

›› 2005, Vol. 13 ›› Issue (3): 242-247.DOI: 10.11733/j.issn.1007-0435.2005.03.015

• 研究论文 • 上一篇    下一篇

积雪对藏北高寒草甸CO2和水汽通量的影响

赵亮1, 徐世晓1, 伏玉玲2, 古松1, 李英年1, 王勤学3, 杜明远4, 赵新全1   

  1. 1. 中国科学院西北高原生物研究所, 青海, 西宁, 810001;
    2. 中国科学院地理科学与资源研究所, 北京, 100101;
    3. 日本国立环境研究所, 日本, 筑波, 3050053;
    4. 日本农林环境技术研究所, 日本, 筑波, 30508604
  • 收稿日期:2004-06-28 修回日期:2005-03-03 出版日期:2005-08-15 发布日期:2005-08-15
  • 作者简介:赵亮(1974- ),青海乐都人,助理研究员,主要从事高原生态学研究工作,E-mail:Lzhao@nwipb.ac.cn
  • 基金资助:
    中国科学院知识创新工程项目(KZCX1-SW-01-01A5);国家973(2002cb4125o1);亚太地区环境创新战略计划(APEIS);中日合作温带高山草原生态系统碳素动态和温暖化影响研究项目

Effects of Snow Cover on CO2 Flux of Northern Alpine Meadow on Qinghai-Tibetan Plateau

ZHAO Liang1, XU Shi-xiao1, FU Yu-ling2, GU Song1, LI Ying-nian1, WANG Qin-xue3, DU Ming-yuan4, ZHAO Xin-quan1   

  1. 1. Northwest Plateau Institute of Biology, CAS, Xining, Qinghai Province 810001 China;
    2. Institute of Geographic Sciences and Natural Research, CAS, Beijing 100101 China;
    3. National Institute for Environmental Studies, Tsukuba, 3050053, Japan;
    4. National Institute of Agro-Environmental Sciences, Tsukuba, 30508604, Japan
  • Received:2004-06-28 Revised:2005-03-03 Online:2005-08-15 Published:2005-08-15

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摘要： 于2002和2003年冬季运用涡度相关法测定藏北草甸在有积雪和无雪条件下的CO2和水汽通量。结果表明:在同一层次CO2浓度,在有雪时CO2浓度低于无雪时,其中只有20cm和160cm层次间差异极显著(P<0.01);在同一层次,前者的水汽浓度极显著地高于后者(P<0.01);积雪时,CO2通量与5cm土温相关不显著;高寒草甸CO2交换量,随着积雪时间的延长呈线性降低,而高寒灌丛和沼泽则相反;沼泽和草甸在有雪时,CO2通量值极显著高于无雪时(P<0.01),而灌丛在这两个条件下CO2通量值之间差异不显著。

关键词: 青藏高原, 积雪, CO2通量, 涡度相关法

Abstract: The alpine meadow ecosystem on Qinghai-Tibetan plateau plays a significant role in the regional carbon cycle. To assess the CO2 flux and its relationship to environmental controls in the ecosystems, eddy covariance of CO2 was measured from both snow-covered areas and on snow areas with open-path system in an alpine meadow of the plateau, during the winters of 2002 and 2003. The results indicated:At the same height, average CO2 concentration in snow-covered conditions was less intense than in nosnow conditions, but significant differences occurred between 20 cm height and 160 cm level (P<0.01). The average H2O con-centration in snow covered conditions was significantly more intense than in no snow conditions, respectively (P<0.01). In snow covered conditions, there was no significant relationship between CO2 flux (and 5 cm)(soil temperature). There was a significant, linearity relationship between CO2 flux and the number of (snow-covered)days in the alpine meadow; however, no such relationship existed in both the shrub meadow and the swamp meadow. Net ecosystem CO2 exchange in snow-covered condition was significantly more frequent (than in no)snow conditions(P<0.01). The CO2 flux of the shrub meadow in snow covered condition ((0.86 g/m2 d)), however was not significantly different from no snow condition (0.60 g/m2 d). The seasonal snow influences the C cycling in winter of the Qinghai-Tibetan plateau.

Key words: Qinghai-Tibetan plateau, Snow pack, CO2flux, Eddy covariance

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