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| Titel |
The role of vegetation in the CO2 flux from a tropical urban neighbourhood |
| VerfasserIn |
E. Velasco, M. Roth, S. H. Tan, M. Quak, S. D. A. Nabarro, L. Norford |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 20 ; Nr. 13, no. 20 (2013-10-16), S.10185-10202 |
| Datensatznummer |
250085756
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| Publikation (Nr.) |
 copernicus.org/acp-13-10185-2013.pdf |
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| Zusammenfassung |
| Urban surfaces are usually net sources of CO2. Vegetation can
potentially have an important role in reducing the CO2 emitted by
anthropogenic activities in cities, particularly when vegetation is
extensive and/or evergreen. A direct and accurate estimation of carbon
uptake by urban vegetation is difficult due to the particular
characteristics of the urban ecosystem and high variability in tree
distribution and species. Here, we investigate the role of urban vegetation
in the CO2 flux from a residential neighbourhood in Singapore using two
different approaches. CO2 fluxes measured directly by eddy covariance
are compared with emissions estimated from emissions factors and activity
data. The latter includes contributions from vehicular traffic, household
combustion, soil respiration and human breathing. The difference between
estimated emissions and measured fluxes should approximate the flux
associated with the aboveground vegetation. In addition, a tree survey was
conducted to estimate the annual CO2 sequestration using allometric
equations and an alternative model of the metabolic theory of ecology for
tropical forests. Palm trees, banana plants and turfgrass were also included
in the survey with their annual CO2 uptake obtained from published
growth rates. Both approaches agree within 2% and suggest that vegetation
sequesters 8% of the total emitted CO2 in the residential
neighbourhood studied. An uptake of 1.4 ton km−2 day−1
(510 ton km−2 yr−1) was estimated as the difference between assimilation by
photosynthesis minus the aboveground biomass respiration during daytime (4.0
ton km−2 day−1) and release by plant respiration at night (2.6 ton km−2 day−1). However, when soil respiration is added to the daily
aboveground flux, the biogenic component becomes a net source amounting to
4% of the total CO2 flux and represents the total
contribution of urban vegetation to the carbon flux to the atmosphere. |
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