articleSoil Science Society of America JournalMay 1, 2003Closed access

A Proposed Mechanism for the Pulse in Carbon Dioxide Production Commonly Observed Following the Rapid Rewetting of a Dry Soil

NFNoah FiererJPJoshua P. Schimel

University of California, Santa Barbara

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Abstract

The rapid rewetting of a dry soil often yields a pulse in soil CO 2 production that persists for 2 to 6 d. This phenomenon is a common occurrence in surface soils, yet the mechanism responsible for producing the CO 2 pulse has not been positively identified. We studied the effects of a single drying and rewetting event on soil C pools, to identify which specific C substrates are mineralized to produce the observed pulse in respiration rates. We labeled two soils with 14 C‐glucose and measured the enrichment and pool sizes of the released CO 2 , extractable biomass C, and extractable soil organic matter (SOM‐C) throughout a drying and rewetting cycle. After rewetting, respiration rates were 475 to 370% higher…

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Topics & keywords

Topics
Keywords
  • Mineralization (soil science)
  • Soil water
  • Environmental chemistry
  • Biomass (ecology)
  • Chemistry
  • Soil respiration
  • Carbon dioxide
  • Organic matter
UN Sustainable Development Goals
  • Clean water and sanitation
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