 |
| Titel |
Effects of diurnal warming on soil respiration are not equal to the summed effects of day and night warming in a temperate steppe |
| VerfasserIn |
J. Xia, Y. Han, Z. Zhang, Z. Zhang, S. Wan |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 6, no. 8 ; Nr. 6, no. 8 (2009-08-03), S.1361-1370 |
| Datensatznummer |
250003935
|
| Publikation (Nr.) |
 copernicus.org/bg-6-1361-2009.pdf |
|
|
|
|
|
| Zusammenfassung |
| The magnitude of daily minimum temperature increase is greater than that of
daily maximum temperature increase under climate warming. This study was
conducted to examine whether changes in soil respiration under diurnal
warming are equal to the summed changes under day and night warming in a
temperate steppe in northern China. A full factorial design with day and
night warming was used in this study, including control, day
(06:00 a.m.–06:00 p.m., local time) warming, night (06:00 p.m.–06:00 a.m.) warming, and diurnal
warming. Day warming showed no effect on soil respiration, whereas night
warming significantly increased soil respiration by 7.1% over the 3
growing seasons in 2006–2008. The insignificant effect of day warming on
soil respiration could be attributable to the offset of the direct positive
effects of increased temperature by the indirect negative effects via
aggravating water limitation and suppressing ecosystem C assimilation. The
positive effects of night warming on soil respiration were largely due to
the stimulation of ecosystem C uptake and substrate supply via
overcompensation of plant photosynthesis. Changes in both soil respiration
(+20.7 g C m−2 y−1) and GEP (−2.8 g C m−2 y−1) under
diurnal warming are smaller than their summed changes (+40.0 and +24.6 g C m−2 y−1, respectively)
under day and night warming. Our findings
that the effects of diurnal warming on soil respiration and gross ecosystem
productivity are not equal to the summed effects of day and night warming
are critical for model simulation and projection of climate-carbon feedback. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|