 |
| Titel |
Measurement depth effects on the apparent temperature sensitivity of soil respiration in field studies |
| VerfasserIn |
A. Graf, L. Weihermüller, J. A. Huisman, M. Herbst, J. Bauer, H. Vereecken |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 5, no. 4 ; Nr. 5, no. 4 (2008-08-26), S.1175-1188 |
| Datensatznummer |
250002687
|
| Publikation (Nr.) |
 copernicus.org/bg-5-1175-2008.pdf |
|
|
|
|
|
| Zusammenfassung |
| CO2 efflux at the soil surface is the result of respiration in different
depths that are subjected to variable temperatures at the same time.
Therefore, the temperature measurement depth affects the apparent temperature
sensitivity of field-measured soil respiration. We summarize existing
literature evidence on the importance of this effect, and describe a simple
model to understand and estimate the magnitude of this potential error source
for heterotrophic respiration. The model is tested against field
measurements. We discuss the influence of climate (annual and daily
temperature amplitude), soil properties (vertical distribution of CO2
sources, thermal and gas diffusivity), and measurement schedule (frequency,
study duration, and time averaging). Q10 as a commonly used parameter
describing the temperature sensitivity of soil respiration is taken as an
example and computed for different combinations of the above conditions. We
define conditions and data acquisition and analysis strategies that lead to
lower errors in field-based Q10 determination. It was found that
commonly used temperature measurement depths are likely to result in an
underestimation of temperature sensitivity in field experiments. Our results
also apply to activation energy as an alternative temperature sensitivity
parameter. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|