In situ measurements reveal extremely low pH in soil

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We measured pH in situ in the top organic soil horizons in heathland and pine forest and found values between 2.6 and 3.2. This was 0.5e0.8 units lower than concurrent laboratory pH measurements of the same soil, which raises questions about the interpretation of pH measurements. We propose that the higher pH recorded by standard laboratory methods may be due to buffering ions from soil biota released from drying, grinding and rewetting of soil samples, whereas the in situ pH reflects the correct level of acidification.
Original languageEnglish
JournalSoil Biology and Biochemistry
Pages (from-to)63-65
Number of pages3
Publication statusPublished - 3 Oct 2017

    Research areas

  • Acidification, Iron buffer, pH,

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