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    神农架大九湖泥炭湿地CH4通量特征及其影响因子

    李艳元 葛继稳 彭凤姣 周颖 李金群 吴先 刘奕伶 张志麒

    李艳元, 葛继稳, 彭凤姣, 周颖, 李金群, 吴先, 刘奕伶, 张志麒, 2017. 神农架大九湖泥炭湿地CH4通量特征及其影响因子. 地球科学, 42(5): 832-842. doi: 10.3799/dqkx.2017.071
    引用本文: 李艳元, 葛继稳, 彭凤姣, 周颖, 李金群, 吴先, 刘奕伶, 张志麒, 2017. 神农架大九湖泥炭湿地CH4通量特征及其影响因子. 地球科学, 42(5): 832-842. doi: 10.3799/dqkx.2017.071
    Li Yanyuan, Ge Jiwen, Peng Fengjiao, Zhou Ying, Li Jinqun, Wu Xian, Liu Yiling, Zhang Zhiqi, 2017. Characteristics of Methane Flux and Their Effect Factors on Dajiuhu Peatland of Shennongjia. Earth Science, 42(5): 832-842. doi: 10.3799/dqkx.2017.071
    Citation: Li Yanyuan, Ge Jiwen, Peng Fengjiao, Zhou Ying, Li Jinqun, Wu Xian, Liu Yiling, Zhang Zhiqi, 2017. Characteristics of Methane Flux and Their Effect Factors on Dajiuhu Peatland of Shennongjia. Earth Science, 42(5): 832-842. doi: 10.3799/dqkx.2017.071

    神农架大九湖泥炭湿地CH4通量特征及其影响因子

    doi: 10.3799/dqkx.2017.071
    基金项目: 

    中国地质大学(武汉)中央高校基本科研业务费专项 1323521225

    环境保护部生态环境十年变化遥感调查与评估项目 2012046151

    环境保护部生态环境十年变化遥感调查与评估项目 2012046395

    中国地质大学(武汉)中央高校基本科研业务费专项 1323521325

    详细信息
      作者简介:

      李艳元(1991-),女,硕士,主要从事湿地生态学研究.ORCID:0000-0001-6947-4202.E-mail:Sophieyuanba@163.com

      通讯作者:

      葛继稳,ORCID:0000-0003-0594-4417.E-mail:gejiwen2002@aliyun.com

    • 中图分类号: P421

    Characteristics of Methane Flux and Their Effect Factors on Dajiuhu Peatland of Shennongjia

    • 摘要: 开展大九湖湿地生态系统CH4通量研究,对深入了解碳循环机制、科学经营以及准确评估湿地生态系统碳收支等方面具有重要意义.以湖北省神农架林区大九湖亚高山泥炭湿地为研究区域,采用涡度相关法对CH4通量进行原位连续观测,分析了泥炭湿地CH4通量变化特征及其影响因素.结果表明,大九湖泥炭湿地在2015年8月至2016年5月期间表现为CH4的源,日通量均值为15.57 nmol·m-2·s-1.CH4通量具有“夜间极大值”(2:00或22:00) 和“三峰模式”(6:00、12:00和22:00) 两种昼夜变化规律;CH4通量具有明显季节变化规律,8月释放最多(36.46 nmol·m-2·s-1),3月释放最少(3.92 nmol·m-2·s-1).相关性分析表明,大九湖泥炭湿地CH4通量受空气温度(Ta)、土壤温度(Ts)、土壤含水量(SWC)和摩擦风速(U*)的共同影响;不同时间尺度上,各影响因子与CH4通量的相关性有所差异.曲线拟合得出,CH4通量与TaTs呈指数增长趋势,与SWC呈二次曲线关系.

       

    • 图  1  大九湖泥炭湿地环境因子变化

      Fig.  1.  Variations of environmental factors in Dajiuhu peatland

      图  2  CH4通量月平均日变化

      a.8月;b.9月;c.10月;d.11月;e.12月;f.1月;g.2月;h.3月;i.4月;j.5月

      Fig.  2.  Monthly mean diurnal variation of CH4 flux

      图  3  CH4通量日平均变化

      图中上坐标对应绘制的“CH4月平均通量变化”条形图;下坐标对应绘制的“CH4日平均通量变化”折线图

      Fig.  3.  Daily mean variation of CH4 flux

      图  4  CH4日通量与温度的拟合曲线

      Fig.  4.  Simulated curves of relationship between diurnal CH4 flux and temperature

      图  5  CH4日通量与土壤含水量的拟合曲线

      Fig.  5.  Simulated curves of relationship between diurnal CH4 flux and soil water content

      表  1  环境因子月平均变化

      Table  1.   Average monthly changes in environmental factors

      年份月份Ta(℃)P(mm)Ts(℃)SWC(m3·m-3)
      Ts10Ts20Ts30SWC10SWC20SWC30
      817.90±0.05123.20±0.1520.21±0.0419.54±0.0318.59±0.020.65±0.000.63±0.000.61±0.00
      915.91±0.06100.90±0.1217.58±0.0417.32±0.0416.99±0.030.68±0.000.64±0.000.61±0.00
      20151010.96±0.06103.22±0.1613.84±0.0514.03±0.0414.27±0.030.71±0.000.64±0.000.62±0.00
      117.17±0.1071.76±0.149.54±0.0510.02±0.0310.75±0.020.79±0.000.64±0.000.62±0.00
      120.07±0.0722.70±0.043.78±0.044.79±0.046.16±0.040.81±0.000.65±0.000.63±0.00
      1-1.59±0.1115.70±0.032.01±0.012.69±0.013.77±0.010.81±0.000.65±0.000.63±0.00
      22.53±0.1332.20±0.072.03±0.022.36±0.023.05±0.010.81±0.000.65±0.000.63±0.00
      201635.17±0.1096.90±0.156.82±0.046.50±0.036.27±0.020.80±0.000.65±0.000.62±0.00
      411.13±0.05139.10±0.2212.22±0.0311.28±0.0310.35±0.030.76±0.000.64±0.000.62±0.00
      514.00±0.07168.30±0.1815.43±0.0314.63±0.0213.75±0.010.65±0.000.62±0.000.59±0.00
      均值8.21±0.062.91±0.1310.25±0.0510.23±0.0510.31±0.040.75±0.000.64±0.000.62±0.00
      注:Ts10.地面以下10 cm处土壤温度;Ts20.地面以下20 cm处土壤温度;Ts30.地面以下30 cm处土壤温度;SWC10.地面以下10 cm处土壤含水量;SWC20.地面以下20 cm处土壤含水量;SWC30.地面以下30 cm处土壤含水量.
      下载: 导出CSV

      表  2  各环境因子的相关性分析

      Table  2.   Correlations analysis of different factors

      TaTs10Ts20Ts30SWC10SWC20SWC30U*
      Fhh0.460**0.565**0.584**0.597**-0.537**-0.529**-0.491**0.032**
      Fd0.700**0.798**0.817**0.835**-0.754**-0.732**-0.692**-0.064
      Fm0.830**0.891**0.903**0.927**-0.830**-0.842**-0.806**-0.503
      注:“**”表示在置信度(双测)为0.01时,相关性是显著的.Fhh.半小时的CH4通量;Fd.CH4日平均通量;Fm.CH4月平均通量;Ta.空气温度;U*.摩擦风速.
      下载: 导出CSV
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    • 收稿日期:  2016-12-17
    • 刊出日期:  2017-05-15

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