Carbon fluxes from an urban tropical grassland.

Autor: Ng BJL; Department of Geography, National University of Singapore, Singapore., Hutyra LR; Boston University, Department of Earth and Environment, Boston, MA, USA. Electronic address: lrhutyra@bu.edu., Nguyen H; Boston University, Department of Earth and Environment, Boston, MA, USA., Cobb AR; Singapore-MIT Alliance for Research and Technology, Center for Environmental Sensing and Modeling, 1 CREATE Way, Singapore., Kai FM; Singapore-MIT Alliance for Research and Technology, Center for Environmental Sensing and Modeling, 1 CREATE Way, Singapore., Harvey C; Singapore-MIT Alliance for Research and Technology, Center for Environmental Sensing and Modeling, 1 CREATE Way, Singapore; Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, Cambridge, MA, USA., Gandois L; Singapore-MIT Alliance for Research and Technology, Center for Environmental Sensing and Modeling, 1 CREATE Way, Singapore; Université de Toulouse: UPS, INP, EcoLab (Laboratoire Ecologie fonctionnelle et Environnement), ENSAT, Avenue de l'Agrobiopôle, F-31326 Castanet-Tolosan, France; CNRS, EcoLab, F-31326 Castanet-Tolosan, France.
Jazyk: angličtina
Zdroj: Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2015 Aug; Vol. 203, pp. 227-234. Date of Electronic Publication: 2014 Jul 04.
DOI: 10.1016/j.envpol.2014.06.009
Abstrakt: Turfgrass covers a large fraction of the urbanized landscape, but the carbon exchange of urban lawns is poorly understood. We used eddy covariance and flux chambers in a grassland field manipulative experiment to quantify the carbon mass balance in a Singapore tropical turfgrass. We also assessed how management and variations in environmental factors influenced CO2 respiration. Standing aboveground turfgrass biomass was 80 gC m(-2), with a mean ecosystem respiration of 7.9 ± 1.1 μmol m(-2) s(-1). The contribution of autotrophic respiration was 49-76% of total ecosystem respiration. Both chamber and eddy covariance measurements suggest the system was in approximate carbon balance. While we did not observe a significant relationship between the respiration rates and soil temperature or moisture, daytime fluxes increased during the rainy interval, indicating strong overall moisture sensitivity. Turfgrass biomass is small, but given its abundance across the urban landscape, it significantly influences diurnal CO2 concentrations.
(Copyright © 2014 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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