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首页> 外文期刊>Soil Science Society of America Journal >Automated Monitoring of Soil Respiration: A Moving Chamber Design
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Automated Monitoring of Soil Respiration: A Moving Chamber Design

机译：自动化监测土壤呼吸：移动室设计

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摘要

We designed, constructed, and tested an automated chamber system for continuously monitoring soil respiration. Our objective was to design a chamber that would permit monitoring of CO2 efflux rates over long time periods without altering the natural microclimate within the chamber. Furthermore, the design would permit accurate measurements even in a highly fluctuating CO2 environment. We built a chamber that operates by closing over the soil in response to a control signal and remains closed for a 14-min period before opening again. Thus, the chamber allows normal drying and wetting of the soil between measurements. An automated switching system was programmed to sequentially open and close chambers in concert with an infrared gas analysis system (IRGA). The IRGA was operated in a differential mode, and equivalent flow rates of reference gas (ambient air) and sample gas (air exiting chamber) were maintained with mass flow controllers. A flexible neoprene lid, stretched tightly over each chamber when closed, provided an airtight seal. This feature and the use of a large mixing bottle (for buffering frequent changes in ambient CO2 concentration) permitted us to measure soil CO2 efflux rates even in an environment with highly variable atmospheric CO2 concentration. Soil respiration rates, measured over a period of several weeks with the automated chambers, were in agreement with traditional point-in-time measurements, and the soil microclimate was not affected by the chambers. However, when extrapolated over a period of several weeks the point-in-time measurements overestimated CO2 efflux rates based on continuous measurements with the automated system.
机译：我们设计，构造和测试了用于持续监测土壤呼吸的自动箱系统 。我们的目标 是设计一个可以长时间监控CO 2 排量的腔室，而不会改变自然的 室内的小气候。此外，即使在波动很大的CO 2 环境中，该设计也允许 进行精确的测量。我们建立了一个小室，该小室通过响应控制信号关闭土壤而保持运转，并保持关闭状态14分钟，然后再次打开。因此，试验箱 允许两次测量之间土壤的正常干燥和润湿。 自动切换系统经过编程，可以依次 一致地打开和关闭试验箱使用红外气体分析 系统（IRGA）。 IRGA以差动模式运行， 并以质量流量保持参考气体（环境空气）和 样品气体（出气室）的等效流速。 控制器。柔性氯丁橡胶盖在关闭时在每个腔室上紧紧伸展，提供气密性密封。此功能 和使用大型混合瓶（用于缓冲环境CO 2 浓度中频繁的 变化）使我们能够测量 < / sup>土壤CO 2 的外排率，即使在 大气CO 2 浓度变化很大的环境中也是如此。用自动箱在数周内测得的 土壤呼吸速率 与传统的时间点测量值 一致 但是，当在数周内外推时， 的时间点测量值会高估CO 2 流出率基于 ，使用自动系统进行连续测量。

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  • 来源
    《Soil Science Society of America Journal》 |2003年第4期|1266-1272|共7页
  • 作者

    Nelson T. Edwards; Jeffery S. Riggs;

  • 作者单位

    Environmental Sciences Division, Oak Ridge National Lab., Oak Ridge, TN 37831-6422;

    Environmental Sciences Division, Oak Ridge National Lab., Oak Ridge, TN 37831-6422;

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  • 正文语种 eng
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