Oxygen diffusion rate (ODR) and redox potential (E_H) are quantitative indices representing oxygen availability and redox status in soils, which is valuable information for better understanding causes and effects of soil aeration. Because these indices are spatially and temporally highly variable, continuous measurements and adequate numbers of repetitions are essential for accurate in situ monitoring. Here, we present a new, fully automated recording system for in situ measurements where ODR and E_H are measured at the same platinum electrode. The conflict between electrode polarization for ODR and the resulting biased E_H readings is solved by reducing the polarization time and introducing a recovery interval between two consecutive measurement cycles. The shorter polarization time ensures accurate E_H readings. It also results in moderately overestimated ODR readings, but this can be corrected before data analysis. The recovery interval restricts temporal resolution of the E_H‐ODR data pairs to 8 h. We illustrate the use of the system with measurements in a field experiment in Zürich, Switzerland. ODR curves at different depths ran roughly parallel to the corresponding curves of O₂ concentration in soil air but ODR was much more sensitive to precipitation. Low ODR was a necessary but not a sufficient condition for declining E_H. E_H ran parallel to O₂ concentration in soil air rather than to ODR. The fully automated system allows for time series of replicate measurements in multifactorial field studies with reasonable labor requirements. It may be particularly suitable for studies examining the effects of soil tillage, compaction, and irrigation, where structure‐related soil properties such as porosity, gas permeability, and soil aeration play a dominant role.

中文翻译：

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准连续同时测量土壤中氧扩散速率和氧化还原电位的系统

氧扩散率（ODR）和氧化还原电势（E _H）是代表土壤中氧气可用性和氧化还原状态的定量指标，这对于更好地了解土壤通气的原因和影响是有价值的信息。由于这些指标在空间和时间上高度可变，因此连续测量和足够的重复次数对于准确的原位监测至关重要。在这里，我们提出了一种全新的全自动记录系统，用于原位测量，其中ODR和E _H在同一铂电极上进行测量。ODR的电极极化与产生的偏置E _H之间的冲突通过减少极化时间并在两个连续的测量周期之间引入恢复间隔来解决读数问题。较短的极化时间可确保准确的E _H读数。它还会导致ODR读数被适度高估，但是可以在进行数据分析之前进行更正。恢复间隔将E _H -ODR数据对的时间分辨率限制为8 h。我们在瑞士苏黎世的现场实验中说明了该系统与测量的结合使用。不同深度的ODR曲线大致平行于土壤空气中O ₂浓度的相应曲线，但ODR对降水更为敏感。低ODR是E _H下降的必要条件，但不是充分条件。Ë _{^ h}与土壤空气中的O ₂浓度平行，而不与ODR平行。全自动系统允许在合理的劳动力需求下进行多因素现场研究中重复测量的时间序列。它可能特别适用于研究土壤耕作，压实和灌溉的影响的研究，在这些研究中，与结构相关的土壤特性（例如孔隙度，透气性和土壤通气性）起主要作用。