Sammanfattning

A large-scale tree-girdling experiment enabled estimates in the field of the contribution of extramatrical mycelium of ectomycorrhizal (ECM) fungi to soil microbial biomass and by ECM roots and fungi to production of dissolved organic carbon (DOC).Tree-girdling was made early (EG) or late (LG) during the summer to terminate the flow of photosynthate to roots and ECM fungi. Determination of microbial C (C-micr) and microbial N in root-free organic soil was performed by using the fumigation-extraction technique; extractable DOC was determined on unfumigated soil.Soil C-micr was 41% lower on LG than on control plots I month after LG, whereas at the same time (that is, 3 months after EG), the C(micr)was 23% lower on EG than on control plots. Extractable DOC was 45% lower on girdled plots than control plots.Our results, which are of particular interest as they were obtained directly in the field, clearly demonstrate the important contribution by extramatrical ECM mycelium to soil microbial biomass and by ECM roots to the production of DOC, a carbon source for other microbes. (C) New Phytologist (2002) 154: 791-795.

Nyckelord

ectomycorrhizal fungi; extractable dissolved organic carbon (DOC); ectomycorrhizal mycelium; forest soil; fumigation-extraction; microbial N; soil microbial biomass

Publicerad i

New Phytologist
2002, Volym: 154, nummer: 3, sidor: 791-795

SLU författare

• Högberg, Mona N

  • Institutionen för skogsekologi, Sveriges lantbruksuniversitet
    

• Högberg, Peter

  • Institutionen för skogsekologi, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Skogsvetenskap


Publikationens identifierare

DOI: https://doi.org/10.1046/j.1469-8137.2002.00417.x

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/70519