 |
| Titel |
Soil temperature and soil moisture induced spatio-temporal variability of soil respiration in winter wheat |
| VerfasserIn |
N. Prolingheuer, M. Herbst, A. Graf, J. Vanderborght, H. Vereecken |
| Konferenz |
EGU General Assembly 2009
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250026629
|
|
|
|
|
|
| Zusammenfassung |
| Soil respiration is the major transfer of CO2 from the soil to the atmosphere and
is characterized by a high spatio-temporal variability depending, among others,
on variations in soil temperature and soil moisture. We simultaneously measured
soil respiration, soil temperature (3 cm depth) and soil moisture (0-5 cm depth) in
winter wheat from April to September 2008 at a 50x50 m plot at a site near Jülich,
Germany. The average soil respiration rate over the whole sampling period was
3.8 ±1.5 μmol m-2 s-1. Spatial variations of soil respiration, represented by the
coefficient of variation (CV), were in average more than 5 times higher than the
spatial variations of soil temperature and soil moisture, respectively. Concerning
soil respiration, considerably higher spatial variations were observed during the
growth period of winter wheat. Semivariogram analysis revealed a strong spatial
autocorrelation of soil temperature, whereas a moderate spatial autocorrelation of soil
respiration and soil moisture was detected. However, the range of spatial autocorrelation
was nearly similar for all three variables, on average 20 m. For the given temporal
and spatial scale, a large proportion in temporal changing of the spatial structure
of soil respiration could be explained by the spatial distribution of soil moisture. |
|
|
|
|
|
|