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    徐昳晅, 同小娟, 张劲松, 孟平, 李俊. 太行山南麓刺槐人工林土壤呼吸与土壤温度间的滞后关系[J]. 北京林业大学学报, 2019, 41(4): 78-87. DOI: 10.13332/j.1000-1522.20180398
    引用本文: 徐昳晅, 同小娟, 张劲松, 孟平, 李俊. 太行山南麓刺槐人工林土壤呼吸与土壤温度间的滞后关系[J]. 北京林业大学学报, 2019, 41(4): 78-87. DOI: 10.13332/j.1000-1522.20180398
    Xu Yixuan, Tong Xiaojuan, Zhang Jinsong, Meng Ping, Li Jun. Time lag between soil respiration and soil temperature in a Robinia pseudoacacia plantation in the south of the Taihang Mountains[J]. Journal of Beijing Forestry University, 2019, 41(4): 78-87. DOI: 10.13332/j.1000-1522.20180398
    Citation: Xu Yixuan, Tong Xiaojuan, Zhang Jinsong, Meng Ping, Li Jun. Time lag between soil respiration and soil temperature in a Robinia pseudoacacia plantation in the south of the Taihang Mountains[J]. Journal of Beijing Forestry University, 2019, 41(4): 78-87. DOI: 10.13332/j.1000-1522.20180398

    太行山南麓刺槐人工林土壤呼吸与土壤温度间的滞后关系

    Time lag between soil respiration and soil temperature in a Robinia pseudoacacia plantation in the south of the Taihang Mountains

    • 摘要:
      目的土壤呼吸是陆地生态系统碳循环的一个重要组成部分。本研究在年尺度和日尺度上分析刺槐人工林土壤呼吸与各土层温度间的温度敏感系数(Q10)的差异,并探讨土壤呼吸与各土层温度间的时间滞后。
      方法利用土壤呼吸自动观测系统Li-8150对太行山南麓50年生刺槐林进行定位观测。
      结果在年尺度上,刺槐人工林土壤呼吸与各土层温度在时间上的滞后不明显,且呈现显著的指数关系(P < 0.001)。Q10在2.23 ~ 2.53之间变动,且Q10随土壤温度测量深度的增加而略微增大,指数模型拟合系数(R2)随土壤温度测量深度的增加而略微减小。土壤呼吸与各土层温度不需要相位校准。在日尺度上,土壤呼吸与各层温度存在时间上的滞后,拟合系数R2较小,获得Q10并不准确。土壤呼吸与各土层温度需要进行相位校准,校准后的土壤呼吸与土壤温度间的拟合系数R2增大,获得的Q10更准确,并且Q10值随土壤温度测量深度增加而增加,但是深层(> 20 cm)的Q10过大并不符合生物学规律。在土壤浅层(< 20 cm),Q10随深度增加与土层温度变化幅度有关。
      结论在年尺度上,各土层Q10值相差不大,都能较理想反映全年刺槐林土壤呼吸与温度的关系。在日尺度上,本研究推荐使用浅层的Q10来反映日间刺槐林土壤呼吸与土壤温度关系。

       

      Abstract:
      ObjectiveSoil respiration is one of main components in carbon cycle of the terrestrial ecosystems. In this study, the difference of temperature sensitivity coefficient (Q10) between soil respiration of Robinia pseudoacacia plantation and soil temperature of each soil layer was examined and the time lag between soil respiration and soil temperature of each soil layer was investigated on annual scale and daily scale.
      MethodSoil respiration was measured using an automatic positioning observation system Li-8150 in the 50-year-old Robinia pseudoacacia plantation in the south of the Taihang Mountains.
      Resulton the annual scale, soil respiration of Robinia pseudoacacia plantation and the temperature of each soil layer had no time lag and showed a significant exponential relationship (P < 0.001) so that their phase need not be calibrated. Q10 varied from 2.23 to 2.53, increased slightly with the measurement depth of soil temperature and the correlation coefficient (R2) of the exponential model decreased slightly with the measurement depth of soil temperature. On the daily scale, soil respiration and the temperature of each soil layer had a time lag with small R2 and inaccurate Q10. Soil respiration and temperature of each soil layer need to be calibrated in phase to obtain a better R2 and more accurate Q10. Q10 increased with the measurement depth of soil temperature after the phase was calibrated, but Q10 measured in subsoil (> 20 cm) was too large for biological characteristics. The increase of Q10 with soil depth was related with the temperature amplitude of soil layer at the surface layer (< 20 cm).
      ConclusionOn the annual scale, the difference of the Q10 value of each soil layer was not evident, which can reflect the relationship between soil respiration of Robinia pseudoacacia plantation and temperature. On a daily scale, surface Q10 is recommended to reflect the relationship between soil respiration of Robinia pseudoacacia plantation and soil temperature.

       

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