A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
METHANE AND NITROUS OXIDE FLUXES FROM URBAN SOILS TO THE ATMOSPHERE
Land‐use change is an important driver of soil–atmosphere gas exchange, but current greenhouse‐gas budgets lack data from urban lands. Field comparisons of urban and non‐urban ecosystems are required to predict the consequences of global urban‐land expansion for greenhouse‐gas budgets. In a rapidly urbanizing region of the U.S. Great Plains, we measured soil–atmosphere exchange of methane (CH4) and nitrous oxide (N2O) for one year in replicated (n = 3) urban lawn, native shortgrass steppe, dryland wheat– fallow, and flood‐irrigated corn ecosystems. All soils were net sinks for atmospheric CH4, but uptake by urban, corn, and wheat–fallow soils was half that of native grasslands (−0.30 ± 0.04 g C·m−2·yr−1 [mean ± 1 se]). Urban (0.24 ± 0.03 g N·m−2·yr−1) and corn (0.20 ± 0.02 g N·m−2·yr−1) soils emitted 10 times more N2O to the atmosphere than native grassland and wheat‐fallow soils. Using remotely sensed land‐cover data we calculated an upper bound for the contribution of lawns to regional soil–atmosphere gas fluxes. Urban lawns occupied 6.4% of a 1578‐km2 study region, but contribute up to 5% and 30% of the regional soil CH4 consumption and N2O emission, respectively, from land‐use types that we sampled. Lawns that cover small portions of the landscape may contribute significantly to regional soil–atmosphere gas exchange.
METHANE AND NITROUS OXIDE FLUXES FROM URBAN SOILS TO THE ATMOSPHERE
Land‐use change is an important driver of soil–atmosphere gas exchange, but current greenhouse‐gas budgets lack data from urban lands. Field comparisons of urban and non‐urban ecosystems are required to predict the consequences of global urban‐land expansion for greenhouse‐gas budgets. In a rapidly urbanizing region of the U.S. Great Plains, we measured soil–atmosphere exchange of methane (CH4) and nitrous oxide (N2O) for one year in replicated (n = 3) urban lawn, native shortgrass steppe, dryland wheat– fallow, and flood‐irrigated corn ecosystems. All soils were net sinks for atmospheric CH4, but uptake by urban, corn, and wheat–fallow soils was half that of native grasslands (−0.30 ± 0.04 g C·m−2·yr−1 [mean ± 1 se]). Urban (0.24 ± 0.03 g N·m−2·yr−1) and corn (0.20 ± 0.02 g N·m−2·yr−1) soils emitted 10 times more N2O to the atmosphere than native grassland and wheat‐fallow soils. Using remotely sensed land‐cover data we calculated an upper bound for the contribution of lawns to regional soil–atmosphere gas fluxes. Urban lawns occupied 6.4% of a 1578‐km2 study region, but contribute up to 5% and 30% of the regional soil CH4 consumption and N2O emission, respectively, from land‐use types that we sampled. Lawns that cover small portions of the landscape may contribute significantly to regional soil–atmosphere gas exchange.
METHANE AND NITROUS OXIDE FLUXES FROM URBAN SOILS TO THE ATMOSPHERE
Kaye, Jason P. (author) / Burke, Ingrid C. (author) / Mosier, Arvin R. (author) / Pablo Guerschman, Juan (author)
Ecological Applications ; 14 ; 975-981
2004-08-01
7 pages
Article (Journal)
Electronic Resource
English
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