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Sensitivity of peatland herbaceous vegetation to vapor pressure deficit influences net ecosystem CO₂ exchange

Titelangaben

Otieno, Dennis O. ; Lindner, Steve ; Muhr, Jan ; Borken, Werner:
Sensitivity of peatland herbaceous vegetation to vapor pressure deficit influences net ecosystem CO₂ exchange.
In: Wetlands. Bd. 32 (2012) Heft 5 . - S. 895-905.
ISSN 1943-6246
DOI: https://doi.org/10.1007/s13157-012-0322-8

Abstract

Mountain peatlands in the temperate regions represent a small proportion of the global peatland resource, but play a unique, although less recognized role in the regional water and biogeochemical cycles. We conducted leaf and ecosystem CO2 exchange measurements during the growing period of 2008 to investigate the effects of vapor pressure deficit (VPD) and ground water level (WL) on leaf gas exchange of two dominant herbaceous species, Molinia caerulea (L.) and Carex nigra (L.) in a mountain peatland. Implications of the leaf-level responses for net ecosystem CO2 exchange (NEE) were examined. Fluctuations in WL influenced soil water content (SWC) within the top 5 cm of the peat profile. Although midday leaf water potential during the day (md) was positively correlated (P 1 kPa regardless of the current WL status. Stomatal conductance was positively correlated with leaf assimilation (A) and root-shoot hydraulic conductance (Ks-l). A decline in NEE during summer was attributed to stomatal closure due to high VPD and low light utilization efficiency (α) of the vegetation. Ecosystem respiration (Reco) was positively correlated with peat temperature at 10 cm depth. Our results suggest that increases in VPD, as a possible scenario of climate change, would lower the photosynthetic capacity of the herbaceous peatland vegetation, despite the high WL, and hence lower the potential of such peatlands as sinks for atmospheric CO2.Key words: Ecosystem carbon dioxide exchange, ground water level, leaf transpiration, grass-dominated peatland, root-shoot hydraulic conductance, stomatal regulation, vapor pressure deficit

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER103650
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie > Lehrstuhl Pflanzenökologie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenökologie
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 Biologie
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: 18 Jun 2015 06:35
Letzte Änderung: 18 Jun 2015 06:35
URI: https://eref.uni-bayreuth.de/id/eprint/15145