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Development and deployment of a field-portable soil O2 and CO2 gas analyzer and sampler

机译:开发和部署可现场携带的土壤O2和CO2气体分析仪和采样器

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摘要

Here we present novel method development and instruction in the construction and use of Field Portable Gas Analyzers study of belowground aerobic respiration dynamics of deep soil systems. Our Field-Portable Gas Analysis (FPGA) platform has been developed at the Calhoun Critical Zone Observatory (CCZO) for the measurement and monitoring of soil O2 and CO2 in a variety of ecosystems around the world. The FPGA platform presented here is cost-effective, lightweight, compact, and reliable for monitoring dynamic soil gasses in-situ in the field. The FPGA platform integrates off-the-shelf components for non-dispersive infrared (NDIR) CO2 measurement and electro-chemical O2 measurement via flow-through soil gas analyses. More than 2000 soil gas measurements have been made to date using these devices over 4 years of observations. Measurement accuracy of FPGAs is consistently high as validated via conventional bench-top gas chromatography. Further, time series representations of paired CO2 and O2 measurement under hardwood forests at the CCZO demonstrate the ability to observe and track seasonal and climatic patterns belowground with this FPGA platform. Lastly, the ability to analyze the apparent respiratory quotient, the ratio of apparent CO2 accumulation divided by apparent O2 consumption relative to the aboveground atmosphere, indicates a high degree of nuanced analyses are made possible with tools like FPGAs. In sum, the accuracy and reliability of the FPGA platform for soil gas monitoring allows for low-cost temporally extensive and spatially expansive field studies of deep soil respiration.
机译:在这里,我们介绍了在现场便携式气体分析仪的建设和使用中研究深层土壤地下有氧呼吸动力学的新方法,并进行了指导。我们的现场便携式气体分析(FPGA)平台是在卡尔霍恩临界区天文台(CCZO)开发的,用于测量和监测世界各地各种生态系统中的土壤O2和CO2。此处介绍的FPGA平台经济高效,轻巧,紧凑且可靠,可用于现场现场监测动态土壤气体。 FPGA平台集成了现成的组件,可通过流通的土壤气体分析来进行非分散红外(NDIR)CO2测量和电化学O2测量。迄今为止,在过去4年的观测中,使用这些设备进行了2000多次土壤气体测量。通过传统的台式气相色谱法验证,FPGA的测量精度始终很高。此外,在CCZO的硬木林下成对的CO2和O2测量的时间序列表示,展示了使用此FPGA平台观察和跟踪地下季节和气候模式的能力。最后,分析表观呼吸商的能力,表观CO2积累的比率除以表观O2相对于地上大气的消耗量,表明使用FPGA之类的工具可以进行高度细微的分析。总而言之,用于土壤气体监测的FPGA平台的准确性和可靠性允许对土壤深层呼吸进行低成本的时间扩展和空间扩展的野外研究。

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