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Responses of CO2 exchange and primary production of the ecosystem components to environmental changes in a mountain peatland

Title data

Otieno, Dennis O. ; Wartinger, Margarete ; Nishiwaki, A. ; Hussain, Mir Zaman ; Muhr, Jan ; Borken, Werner ; Lischeid, Gunnar:
Responses of CO2 exchange and primary production of the ecosystem components to environmental changes in a mountain peatland.
In: Ecosystems. Vol. 12 (2009) Issue 4 . - pp. 590-603.
ISSN 1435-0629
DOI: https://doi.org/10.1007/s10021-009-9245-5

Abstract in another language

The complexity of natural ecological systems presents challenges for predicting the impact of global environmental changes on ecosystem structure and function. Grouping of plants into functional types, that is, groups of species sharing traits that govern their mechanisms of response to environmental perturbations, reduce the complexity of species diversity to a few key plant types for better understanding of ecosystem responses. Chambers were used to measure CO2 exchange in grass and moss growing together in a mountain peatland in southern Germany to assess variations in their response to environmental changes and how they influence ecosystem CO2 exchange. Parameter fits and comparison for net ecosystem exchange (NEE) in two ecosystem components were conducted using an empirical hyperbolic light response model. Annual green biomass production was 320 and 210 g dwt m −2, whereas mean maximum NEE was –10.0 and –5.0 μmol m −2 s −1 for grass and moss, respectively. Grass exhibited higher light use efficiency (α) and maximum gross primary production [(β+γ)2000]. Leaf area index explained 93% of light use and 83% of overall production by the grass. Peat temperature at 10-cm depth explained more than 80% of the fluctuations in ecosystem respiration (R eco). Compared to grass, moss NEE was more sensitive to ground water level (GWL) draw-down and hence could be more vulnerable to changes in precipitation that result in GWL decline and may be potentially replaced by grass and other vegetation that are less sensitive.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER69541
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Ecological Modelling
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: 06 Jul 2015 10:25
Last Modified: 17 Apr 2018 11:19
URI: https://eref.uni-bayreuth.de/id/eprint/15903