Katarina Hedlund. Foto.

Katarina Hedlund

Professor

Katarina Hedlund. Foto.

Long-term agricultural fertilization alters arbuscular mycorrhizal fungal community composition and barley (Hordeum vulgare) mycorrhizal carbon and phosphorus exchange

Författare

  • Alwyn Williams
  • Lokeshwaran Manoharan
  • Nicholas P. Rosenstock
  • Pål Axel Olsson
  • Katarina Hedlund

Summary, in English

Agricultural fertilization significantly affects arbuscular mycorrhizal fungal (AMF) community composition. However, the functional implications of community shifts are unknown, limiting understanding of the role of AMF in agriculture. We assessed AMF community composition at four sites managed under the same nitrogen (N) and phosphorus (P) fertilizer regimes for 55 yr. We also established a glasshouse experiment with the same soils to investigate AMF–barley (Hordeum vulgare) nutrient exchange, using carbon (13C) and 33P isotopic labelling. N fertilization affected AMF community composition, reducing diversity; P had no effect. In the glasshouse, AMF contribution to plant P declined with P fertilization, but was unaffected by N. Barley C allocation to AMF also declined with P fertilization. As N fertilization increased, C allocation to AMF per unit of P exchanged increased. This occurred with and without P fertilization, and was concomitant with reduced barley biomass. AMF community composition showed no relationship with glasshouse experiment results. The results indicate that plants can reduce C allocation to AMF in response to P fertilization. Under N fertilization, plants allocate an increasing amount of C to AMF and receive relatively less P. This suggests an alteration in the terms of P–C exchange under N fertilization regardless of soil P status.

Avdelning/ar

  • BECC - Biodiversity and Ecosystem services in a Changing Climate
  • Centrum för miljö- och klimatvetenskap (CEC)
  • Biologiska institutionen
  • Markgruppen
  • Biodiversitet

Publiceringsår

2017-01-01

Språk

Engelska

Sidor

874-885

Publikation/Tidskrift/Serie

New Phytologist

Volym

213

Issue

2

Dokumenttyp

Artikel i tidskrift

Förlag

Wiley-Blackwell

Ämne

  • Environmental Sciences related to Agriculture and Land-use

Nyckelord

  • agriculture
  • arbuscular mycorrhizal fungi (AMF)
  • carbon (C)
  • diversity
  • fertilizer
  • mutualism
  • nitrogen (N)
  • phosphorus (P)

Status

Published

Forskningsgrupp

  • Soil Ecology

ISBN/ISSN/Övrigt

  • ISSN: 0028-646X