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A single drought event of 100-year recurrence enhances subsequent carbon uptake and changes carbon allocation in experimental grassland communities

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Mirzaei, Heydar ; Kreyling, Jürgen ; Hussain, Mir Zaman ; Li, Yuelin ; Tenhunen, John ; Beierkuhnlein, Carl ; Jentsch, Anke:
A single drought event of 100-year recurrence enhances subsequent carbon uptake and changes carbon allocation in experimental grassland communities.
In: Journal of Plant Nutrition and Soil Science. Bd. 171 (2008) Heft 5 . - S. 681-689.
ISSN 1436-8730
DOI: 10.1002/jpln.200700233

Abstract

Evidence suggests that the expected increase in frequency and magnitude of extreme weather events during climate change will alter plant productivity. Therefore, extreme weather events might also be capable of changing carbon sequestration and allocation. Here, experimental grassland communities of two species compositions, differing in their diversity were exposed either to a simulated single drought or to a heavy rainfall event. The magnitude of these manipulations imitated the local 100-year weather extreme according to extreme value statistics. Effects on Net Ecosystem CO2 Exchange (NEE in µmol m-2 s-1), as well as above-ground biomass production and Leaf Area Index (LAI) were recorded from prior to the manipulations until two months after the manipulations ended. Initial light utilization efficiency and maximum NEE increased after the drought. No change in the respiration was detected and maximum uptake capacity (GPPmax) was 15% higher for the drought manipulated plots compared to controls, which indicates an enhanced CO2 uptake into the systems. The level of diversity was also found to alter the light response curves, increasing respiration and maximum NEE to a higher degree than drought in the more diverse compared to the less diverse community. This resulted in an increase of GPPmax.by 55%. No significant interactions between species composition and weather manipulations were detected. Interestingly, above-ground biomass production was not significantly affected by weather manipulations, even though LAI increased due to drought. This increase was caused by a decrease in the ratio between reproductive and vegetative growth. The heavy rainfall manipulation resulted in no significant effects. Our data suggests that carbon sequestration can be enhanced by a single weather event. However the importance, long-term duration, and thresholds or turning points of such effects need to be investigated further as intensification of weather extremes is currently emerging as one of the most important facets of climate change.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER53725
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Biogeographie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Biogeographie > Lehrstuhl Biogeographie - Univ.-Prof. Dr. Carl Beierkuhnlein
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Professur Störungsökologie und Vegetationsdynamik
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Professur Störungsökologie und Vegetationsdynamik > Professur Störungsökologie und Vegetationsdynamik - Univ.-Prof. Dr. Anke Jentsch
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 05 Jun 2015 06:19
Letzte Änderung: 06 Jul 2015 13:49
URI: https://eref.uni-bayreuth.de/id/eprint/14765