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环境因子对兴安落叶松林生态系统CO2通量的影响

李小梅 张秋良

李小梅, 张秋良. 环境因子对兴安落叶松林生态系统CO2通量的影响[J]. 北京林业大学学报, 2015, 37(8): 31-39. doi: 10.13332/j.1000-1522.20150020
引用本文: 李小梅, 张秋良. 环境因子对兴安落叶松林生态系统CO2通量的影响[J]. 北京林业大学学报, 2015, 37(8): 31-39. doi: 10.13332/j.1000-1522.20150020
LI Xiao-mei, ZHANG Qiu-liang. Impact of climate factors on CO2 flux characteristics in a Larix gmelinii forest ecosystem[J]. Journal of Beijing Forestry University, 2015, 37(8): 31-39. doi: 10.13332/j.1000-1522.20150020
Citation: LI Xiao-mei, ZHANG Qiu-liang. Impact of climate factors on CO2 flux characteristics in a Larix gmelinii forest ecosystem[J]. Journal of Beijing Forestry University, 2015, 37(8): 31-39. doi: 10.13332/j.1000-1522.20150020

环境因子对兴安落叶松林生态系统CO2通量的影响

doi: 10.13332/j.1000-1522.20150020
基金项目: 

林业公益性行业科研专项(201204101-2)、中国科学院战略性先导科技专项(XDA05050601-01-07)、内蒙古农业大学科技创新团队项目(ndpytd2013-4)

详细信息
    作者简介:

    李小梅,博士生。主要研究方向:森林经理学。Email:lxmhlyl@163.com 地址:100101 北京市朝阳区安翔北里甲11号 北京创业大厦A座东门3层。

    责任作者:

    张秋良,教授,博士生导师。主要研究方向:森林经理和森林生态学研究。Email:18686028468@163.com 地址:010019 内蒙古呼和浩特市赛罕区新建东街275号内蒙古农业大学林学院。

Impact of climate factors on CO2 flux characteristics in a Larix gmelinii forest ecosystem

  • 摘要: 采用涡度相关技术,研究了主要环境因子与兴安落叶松林生态系统CO2通量的关系。结果表明: 1)生长季,CO2通量表现出较显著的日变化特征,白天为碳吸收阶段, 12:30—13:30 CO2通量吸收出现峰值,而夜间为碳排放阶段,昼夜CO2通量变化幅度在-1.09~0.11mg/(m2·s)之间,生态系统整体表现出较强的碳汇特征;非生长季,昼夜CO2通量变化幅度在0~0.3mg/(m2·s)之间,生态系统整体表现为碳源。2)生长季光合有效辐射(PAR)与CO2通量呈对数相关(R2=0.4861),随PAR增强,生态系统碳汇能力增大,PAR是CO2通量的直接影响因子;非生长季CO2通量与PAR相关性不显著。3)在生长季,兴安落叶松林CO2通量与气温(ta)有很好的相关性,决定系数R2为0.6272,CO2通量随ta的升高而降低,ta是兴安落叶松林生态系统CO2通量的主要限制因子;非生长季的12月至次年2月份,气温的变化对CO2通量无显著作用。4)土壤温度(ts)和含水率(RH)对CO2通量的影响,主要体现在生态系统呼吸(Re)上,兴安落叶松林生态系统的土壤含水率在62%~87%之间,土壤含水率达到67%以上时,CO2通量基本上不受土壤水分大小的影响。在水分不成为CO2通量限制因子的情况下,土壤温度对兴安落叶松林生态系统CO2通量影响起主要作用,研究表明:土壤温度与CO2通量呈指数相关(生长季R2=0.2826,非生长季R2=0.2223);即在适当的温度范围内,土壤温度的升高会加速植物和微生物的代谢,从而增强森林生态系统的呼吸作用,促进CO2排放。

     

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  • 收稿日期:  2015-01-22
  • 修回日期:  2015-01-22
  • 刊出日期:  2015-08-31

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