 |
| Titel |
Differences in the diurnal pattern of soil respiration under adjacent Miscanthus x giganteus and barley crops reveal potential flaws in accepted sampling strategies |
| VerfasserIn |
James Keane, Phil Ineson |
| Konferenz |
EGU General Assembly 2017
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250149395
|
| Publikation (Nr.) |
 EGU/EGU2017-13742.pdf |
|
|
|
|
|
| Zusammenfassung |
| Soil respiration (Rs) plays an important role in the global carbon cycle and contributes ca.
30% of global ecosystem respiration.However, for convenience, measurements used to
compare Rs from different land uses, crops or management practices are often made
between 09:00 and 16:00, with an implicit assumption that Rs is largely controlled by
temperature. Three months’ continuous data presented here show distinctly different
diurnal patterns of Rs between barley (Hordeum vulgare) and Miscanthus x giganteus
(Miscanthus) grown on adjacent fields. Maximum Rs in barley occurred during the
afternoon and correlated with soil temperature, whereas Rs peaked in Miscanthus
during the night and was significantly correlated with earlier levels of solar radiation,
probably due to delays in translocation of recent photosynthate. Since daily mean Rs in
Miscanthus coincided with levels 40% greater than the mean in barley, it is vital to select
appropriate times to measure Rs if only single daily measurements are to be made. |
|
|
|
|
|
|