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| Titel |
Short-term cropland responses to temperature extreme events during late winter |
| VerfasserIn |
G. Simon, G. Alberti, G. Vedove, A. Peressotti, A. Zaldei, F. Miglietta |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 8 ; Nr. 10, no. 8 (2013-08-16), S.5545-5553 |
| Datensatznummer |
250085302
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| Publikation (Nr.) |
 copernicus.org/bg-10-5545-2013.pdf |
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| Zusammenfassung |
| In recent years, several studies have focused on terrestrial ecosystem
response to extreme events. Most of this research has been conducted in
natural ecosystems, but few have considered agroecosystems. In this study,
we investigated the impact of a manipulated warmer or cooler late
winter/early spring on the carbon budget and final harvest of a soybean crop
(Glycine max (L.) Merr.). Soil temperature was altered by manipulating soil albedo by
covering the soil surface with a layer of inert silica gravel. We tested
three treatments – cooling (Co), warming (W), mix (M) – and control (C). An
automated system continuously measured soil heterotrophic respiration (Rh),
soil temperature profiles, and soil water content across the entire year in
each plot. Phenological phases were periodically assessed and final harvest
was measured in each plot. Results showed that treatments had only a
transient effect on daily Rh rates, which did not result in a total annual
carbon budget significantly different from control, even though cooling
showed a significant reduction in final harvest. We also observed
anticipation in emergence in both W and M treatments and a delay in
emergence for Co. Moreover, plant density and growth increased in W and M
and decreased in Co. In conclusion, from the results of our experiment we
can assert that an increase in the frequency of both heat and cold waves is
unlikely to have large effects on the overall annual carbon balance of
irrigated croplands. |
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