Examination of the method for measuring soil respiration in cultivated land: Effect of carbon dioxide concentration on soil respiration

Toshie Nakadai, Hiroshi Koizumi, Youzou Usami, Mitsumasa Satoh, Takehisa Oikawa

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

An acceleration of soil respiration with decreasing CO2 concentration was suggested in the field measurements. The result supporrs that obtained in laboratory experiments in our previous study. The CO2 concentrations in a chamber of the alkali absorption method (the AA-method) were about 150-250 parts/106 lower than that in the atmosphere (about 350 parts/106), while those observed in the open-flow IRGA method (the OF-method) were nearly equal to the soil surface CO2 levels. The AA-method at such low CO2 levels in the chamber appears to overestimate the soil respiration. Our results showed that the rates obtained by the AA-method were about twice as large as those by the OF-method in field and laboratory measurements. This finding has important consequences with respect to the validity of the existing data obtained by the AA-method and the estimation of changes in the terrestrial carbon flow with elevated CO2

Original languageEnglish
Pages (from-to)65-71
Number of pages7
JournalEcological Research
Volume8
Issue number1
DOIs
Publication statusPublished - 1993 Apr
Externally publishedYes

Keywords

  • alkali absorption method
  • CO concentration
  • open-flow IRGA method
  • soil respiration

ASJC Scopus subject areas

  • Ecology

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