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Sammanfattning

Crop roots and associated microorganisms, specifically arbuscular mycorrhizal fungi (AMF), affect soil carbon (C) and nitrogen (N) transformations, which determine methane (CH4) and nitrous oxide (N2O) emissions. Little is known about the individual contributions of roots and AMF hyphae to soil C and N transformation as well as the subsequent CH4 and N2O emissions. Using an in vivo ingrowth core technique to isolate the effects of roots and AMF hyphae, coupled with static dark chambers to measure CH4 and N2O emissions under various straw management (no tillage and no straw, rotary tillage straw return, and ditch-buried straw return) conditions in a long-term field trial. The presence of AMF hyphae decreased N2O emission by 151 %, meaning there was a consumption, but increased CH4 emission by 59 %. Conversely, wheat root presence increased N2O emission by 199 %, but decreased CH4 emission by 183 %. Straw incorporation increased the magnitude of the rhizosphere and hyphosphere effects on N2O, but not CH4 emissions. The inverse relationship between rhizosphere and hyphosphere was caused mainly by changes in soil available phosphorus (P) and pH. In most cases, soil pH and available P increased by the presence of wheat roots but decreased by AMF hyphae. Random forest model and partial least squares path mode showed that changes in soil pH and available P shifted methane oxidation and nitrification activity, which further contributed to CH4 and N2O emissions. The findings suggest that the contrasting effects of crop rhizosphere and AMF hyphosphere on CH4 and N2O-related processes should be considered in predicting ecosystem C and N budgets under future climate change scenarios.

Nyckelord

rhizosphere processes; arbuscular mycorrhizal fungi; N2O emission; CH4 emission; carbon budget; nitrogen transformation

Publicerad i

Soil and Tillage Research
2026, volym: 255, artikelnummer: 106793

SLU författare

UKÄ forskningsämne

Markvetenskap

Publikationens identifierare

  • DOI: https://doi.org/10.1016/j.still.2025.106793

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/143182