期刊
ENVIRONMENTAL POLLUTION
卷 203, 期 -, 页码 227-234出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2014.06.009
关键词
Soil; CO2 flux; Lawn; Respiration; Urban; Turf
资金
- National Science Foundation (NSF) [EAR-1114155]
- National Research Foundation (NRF) of Singapore through Singapore-MIT Alliance for Research and Technology (SMART) Center
- Directorate For Geosciences
- Division Of Earth Sciences [1114161] Funding Source: National Science Foundation
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 mu mol 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. (C) 2014 Elsevier Ltd. All rights reserved.
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