Meny

Javascript verkar inte påslaget? - Vissa delar av Lunds universitets webbplats fungerar inte optimalt utan javascript, kontrollera din webbläsares inställningar.
Du är här

Below-ground process responses to elevated CO2 and temperature: a discussion of observations, measurement methods, and models

Författare:
  • E Pendall
  • S Bridgham
  • PJ Hanson
  • B Hungate
  • DW Kicklighter
  • DW Johnson
  • BE Law
  • YQ Luo
  • JP Megonigal
  • Maria Olsrud
  • MG Ryan
  • SQ Wan
Publiceringsår: 2004
Språk: Engelska
Sidor: 311-322
Publikation/Tidskrift/Serie: New Phytologist
Volym: 162
Nummer: 2
Dokumenttyp: Artikel
Förlag: Blackwell Publishing Ltd

Sammanfattning

Rising atmospheric CO2 and temperatures are probably altering ecosystem carbon cycling, causing both positive and negative feedbacks to climate. Below-ground processes play a key role in the global carbon (C) cycle because they regulate storage of large quantities of C, and are potentially very sensitive to direct and indirect effects of elevated CO2 and temperature. Soil organic matter pools, roots and associated rhizosphere organisms all have distinct responses to environmental change drivers, although availability of C substrates will regulate all the responses. Elevated CO2 increases C supply below-ground, whereas warming is likely to increase respiration and decomposition rates, leading to speculation that these effects will moderate one another. However, indirect effects on soil moisture availability and nutrient supply may alter processes in unexpected directions. Detailed, mechanistic understanding and modelling of below-ground flux components, pool sizes and turnover rates is needed to adequately predict long-term, net C storage in ecosystems. In this synthesis, we discuss the current status of below-ground responses to elevated CO2 and temperature and potential feedback effects, methodological challenges, and approaches to integrating models and measurements.

Disputation

Nyckelord

  • Earth and Environmental Sciences
  • rhizosphere
  • nutrient cycling
  • mycorrhizas
  • carbon sequestration
  • CO2 fertilization
  • soil carbon
  • soil respiration
  • soil warming

Övriga

Published
Yes
  • ISSN: 0028-646X

Box 117, 221 00 LUND
Telefon 046-222 00 00 (växel)
Telefax 046-222 47 20
lu [at] lu [dot] se

Fakturaadress: Box 188, 221 00 LUND
Organisationsnummer: 202100-3211
Om webbplatsen