Carbon input from plant to soil through root exudation in Digitaria adscendens and Ambrosia artemisiifolia

Yukiko Bekku*, Makoto Kimura, Hiroaki Ikeda, Hiroshi Koizumi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


The amount of carbon released into soil through root exudation by Digitaria adscendens Herrm. and Ambrosia artemisiifolia L. var. elatior Desc., which often predominate at the early stages of secondary succession, was evaluated in a laboratory experiment conducted over a 60-day period. Differences in the amount of exuded carbon between these species and between the developmental stages were examined. The amount of carbon exuded increased with growth in both species. The percentage of exuded carbon to photosynthetically net fixed carbon, which was higher at younger stages (13%) in D. adscendens, decreased to 3.1% with time. On the other hand, no reduction in the amount of carbon exuded was observed in A. artemisiifolia (4.7-8.1% range). The total amount of carbon released through root exudation in D. adscendens and A. artemisiifolia was estimated at 3.1% and 6.9% of photosynthetically net fixed carbon, respectively. These results suggest the possibility that wild plants exude a considerable amount of carbon from their roots to the soil, and emphasizes the necessity for considering root exudation in the carbon cycle.

Original languageEnglish
Pages (from-to)305-312
Number of pages8
JournalEcological Research
Issue number3
Publication statusPublished - 1997 Dec
Externally publishedYes


  • Carbon cycle
  • Root exudation
  • Secondary succession
  • Weed

ASJC Scopus subject areas

  • Ecology


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