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

Title data

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. Vol. 32 (2012) Issue 5 . - pp. 895-905.
ISSN 1943-6246
DOI: https://doi.org/10.1007/s13157-012-0322-8

Abstract in another language

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

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER103650
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Ecology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 18 Jun 2015 06:35
Last Modified: 18 Jun 2015 06:35
URI: https://eref.uni-bayreuth.de/id/eprint/15145