A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Carbon fluxes and nitrogen availability along an urban–rural gradient in a desert landscape
Abstract Urbanization is increasing in arid and semi-arid regions of the world and impacting native ecosystems through disturbance, climatic modification, and pollution deposition. Arid ecosystems often exhibit a mosaic of shrub/tree canopy covered and non-canopy covered patches that differ in elemental pools and processes. We measured belowground ecosystem attributes and processes in native Larrea tridentata {(D.C.) Cov} dominated communities along an urban–rural gradient in Phoenix, Arizona. Organic carbon (C), total nitrogen (N), and nitrate levels were significantly greater in the urban locations, but soil respiration rates ($ R_{s} $) were higher at the rural sites. Urban sites exhibited no difference in $ R_{s} $ and N between the canopy and interplant patches while both the rural and suburban sites had significantly greater N and higher $ R_{s} $ under the canopy than in the interplant spaces. Soil respiration rates at the urban locations were not correlated with either soil moisture or temperature individually. These data suggest that urbanization has caused a disconnect of ecological pattern and processes in L. tridentata ecosystems within the urban setting such that water and N limitations no longer explain expected spatial $ R_{s} $ patterns, or elemental pools.
Carbon fluxes and nitrogen availability along an urban–rural gradient in a desert landscape
Abstract Urbanization is increasing in arid and semi-arid regions of the world and impacting native ecosystems through disturbance, climatic modification, and pollution deposition. Arid ecosystems often exhibit a mosaic of shrub/tree canopy covered and non-canopy covered patches that differ in elemental pools and processes. We measured belowground ecosystem attributes and processes in native Larrea tridentata {(D.C.) Cov} dominated communities along an urban–rural gradient in Phoenix, Arizona. Organic carbon (C), total nitrogen (N), and nitrate levels were significantly greater in the urban locations, but soil respiration rates ($ R_{s} $) were higher at the rural sites. Urban sites exhibited no difference in $ R_{s} $ and N between the canopy and interplant patches while both the rural and suburban sites had significantly greater N and higher $ R_{s} $ under the canopy than in the interplant spaces. Soil respiration rates at the urban locations were not correlated with either soil moisture or temperature individually. These data suggest that urbanization has caused a disconnect of ecological pattern and processes in L. tridentata ecosystems within the urban setting such that water and N limitations no longer explain expected spatial $ R_{s} $ patterns, or elemental pools.
Carbon fluxes and nitrogen availability along an urban–rural gradient in a desert landscape
Koerner, Brenda A. (author) / Klopatek, Jeffrey M. (author)
Urban Ecosystems ; 13
2009
Article (Journal)
Electronic Resource
English
BKL:
43.31
Naturschutz
/
42.90$jÖkologie: Allgemeines
/
43.31$jNaturschutz
/
42.90
Ökologie: Allgemeines
/
74.12
Stadtgeographie, Siedlungsgeographie
/
74.12$jStadtgeographie$jSiedlungsgeographie
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