Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

Soil Biota Responses to Long-Term Atmospheric CO₂ Enrichment in Two California Annual Grasslands

Matthias C. Rillig, Christopher B. Field and Michael F. Allen
Oecologia
Vol. 119, No. 4 (1999), pp. 572-577
Published by: Springer in cooperation with International Association for Ecology
Stable URL: http://www.jstor.org/stable/4222345
Page Count: 6
  • Download ($43.95)
  • Cite this Item
Soil Biota Responses to Long-Term Atmospheric CO₂ Enrichment in Two California Annual Grasslands
Preview not available

Abstract

Root, arbuscular-mycorrhizal (AM), soil faunal (protozoa and microarthropods), and microbial responses to field exposure to CO₂ for six growing seasons were measured in spring 1997 in two adjacent grassland communities. The grasslands showed contrasting root responses to CO₂ enrichment: whereas root length was not affected in the sandstone grassland, it was greater in the serpentine grassland, as was specific root length. AM fungal hyphal lengths were greater in the sandstone, but were unaffected in the serpentine community. This lent support to the hypothesis that there may be a tradeoff in resource allocation to more fine roots or greater mycorrhizal extraradical hyphal length. AM root infection was greater in both communities at elevated CO₂, as was the proportion of roots containing arbuscules. Our data on total hyphal lengths, culturable and active fungi, bacteria, and protozoa supported the hypothesis that the fungal food chain was more strongly stimulated than the bacterial chain. This study is one of the first to test these hypotheses in natural multi-species communities in the field.

Page Thumbnails

  • Thumbnail: Page 
[572]
    [572]
  • Thumbnail: Page 
573
    573
  • Thumbnail: Page 
574
    574
  • Thumbnail: Page 
575
    575
  • Thumbnail: Page 
576
    576
  • Thumbnail: Page 
577
    577