Soil N2O and NO emissions from an arid, urban ecosystem in central Arizona-Phoenix
Author(s):
- Nancy Grimm, School of Life Sciences, Arizona State University
- Sharon Hall, School of Life Sciences, Arizona State University
Abstract:
Soil nitrogen (N) cycling and fluxes of N2O and NO in three land-use types across the metropolitan area of Phoenix, Arizona has been measured.Urbanization increased N2O emissions compared to native landscapes, primarily due to the expansion of fertilized and irrigated lawns. Fluxes of N2O from lawns ranged from 18 to 80 mg N m^(-2) h^(-1) and were significantly larger than managed xeric landscapes (2.5-22 mg N m^(-2) h^(-1)) and remnant desert sites within the urban core (3.7-14 mg N m^(-2) h^(-1)). In contrast, average NO fluxes from lawns were not significantly different from native desert when dry (6-80 mg N m^(-2) h^(-1); 5-16 mg N m^(-2) h^(-1) desert) and were lower than fluxes from deserts after wetting events. Furthermore, urbanization has significantly altered the temporal dynamics of NO emissions by replacing pulse-driven desert ecosystems with year-round irrigated, managed lawns. Short-term, pulse-driven emissions of NO from wetting of dry desert soils may reach 35% of anthropogenic emissions within a day after summer monsoon storms. If regional O3 production is NOx-limited during the monsoon season, fluxes from warm, recently wet arid soils may contribute to summer O3 episodes. .
Keywords:
Temporal Coverage:
2003-03-16 to 2006-06-23Geographic Coverage:
Geographic Description: Phoenix metropolitan area in Arizona, USABounding Coordinates:
Longitude:-111.946295 to -111.898528
Latitude:33.465402 to 33.399775
Contact:
Information Manager,Global Institute of Sustainability,Arizona State University,POB 875402,Tempe
caplter.data@asu.edu
Methods used in producing this dataset: Show
Data Files (3) :
Tabular: 73_sites_1.csv
Description: site descriptions
Column | Description | Type | Units |
---|---|---|---|
SiteID | A unique Id assigned to each site |
integer | |
SiteCode | A abbreviation for the name of the
site |
string | |
SiteName | Name of the site |
string |
Tabular: 73_urbannoxidesvalues_1.csv
Description: N oxide measurement values
Column | Description | Type | Units |
---|---|---|---|
LandUsageTypeID | A unique number assigned to each land use
type |
integer |
Enumeration:
|
Water | Indicates whether data is recorded before watering or after
watering |
string |
Enumeration:
|
VariableID | A unique id assigned to each variable |
integer | |
Value | The data value recorded |
float | dimensionless |
SiteID | A unique id assigned to each site as used in the Site
table |
integer | |
Date | Actual date when the data is recorded |
datetime | Format: YYYY-MM-DD |
ValuesID | A unique id assigned to each row |
integer |
Tabular: 73_variables_1.csv
Description: measured variables description and units
Column | Description | Type | Units |
---|---|---|---|
VariableID | A unique id assigned to each variable |
integer | |
VariableCode | A abbreviation for the variable name |
string | |
VariableName | Name of the variable |
string | |
MeasurementUnit | Units of measurement used to measure the
variable |
string |