| |
| Web URL(s): | http://www.jstor.org/stable/pdfplus/40062237.pdf?acceptTC=true
Last checked: 02/21/2012
Requires: PDF Reader
Access conditions: Item is within a limited-access website
http://www.jstor.org/stable/40062237
Last checked: 02/27/2012
Access conditions: Item is within a limited-access website
http://www.jstor.org/stable/info/40062237
Last checked: 03/01/2012
Access conditions: Item is within a limited-access website |
|---|
| Publication Type:
| Refereed |
|---|
| Author(s): | Raciti, S. M.;
Groffman, P. M.;
Fahey, T. J. |
|---|
| Author Affiliation: | Raciti and Fahey: Department of Natural Resources, Cornell University, Ithaca, New York; Groffman: Institute of Ecosystem Studies, Millbrook, New York |
|---|
| Title: | Nitrogen retention in urban lawns and forests |
|---|
| Source: | Ecological Applications: A publication of the Ecological Society of America. Vol. 18, No. 7, October 2008, p. 1615-1626. |
|---|
| Publishing Information: | Washington, DC: Ecological Society of America |
|---|
| # of Pages: | 12 |
|---|
| Related Web URL: | http://www.jstor.org/stable/info/40062237#abstract
Last checked: 03/01/2012
Notes: Abstract only |
|---|
| Keywords: | TIC Keywords: Atmospheric deposition; Ground cover; Mineral soils; Mineralization; Nitrification; Nitrogen retention; Tissue testing; Urban habitat; Vegetation types; Water quality; Watersheds
|
|---|
| Abstract/Contents: | "Lawns are a dominant cover type in urban ecosystems, and there is concern about their impacts on water quality. However, recent watershed-level studies suggest that these pervious areas might be net sinks, rather than sources, for nitrogen (N) in the urban environment. A 15N pulse-labeling experiment was performed on lawn and forest plots in the Baltimore (Maryland, USA) metropolitan area to test the hypothesis that lawns are a net sink for atmospheric-N deposition and to compare and contrast mechanisms of N retention in these vegetation types. A pulse of 15N-NO3-, simulating a precipitation event, was followed through mineral soils, roots, Oi-layer/thatch, aboveground biomass, microbial biomass, inorganic N, and evolved N2 gas over a one-year period. The 15N label was undetectable in gaseous samples, but enrichment of other pools was high. Gross rates of production and consumption of NO3- and NH4+ were measured to assess differences in internal N cycling under lawns and forests. Rates of N retention were similar during the first five days of the experiment, with lawns showing higher N retention than forests after 10, 70, and 365 days. Lawns had larger pools of available NO3- and NH4+; however, gross rates of mineralization and nitrification were also higher, leading to no net differences in NO3- and NH4+ turnover times between the two systems. Levels of 15N remained steady in forest mineral soils from day 70 to 365 (at 23% of applied 15N), but continued to accumulate in lawn mineral soils over this same time period, increasing from 20% to 33% of applied 15N. The dominant sink for N in lawn plots changed over time. Immobilization in mineral soils dominated immediately (one day) after tracer application (42% of recovered 15N); plant biomass dominated the short term (10 days; 51%); thatch and mineral-soil pools together dominated the medium term (70 days; 28% and 36%, respectively); and the mineral-soil pool alone dominated long-term retention (one year; 70% of recovered 15N). These findings illustrate the mechanisms whereby urban and suburban lawns under low to moderate management intensities are an important sink for atmospheric-N deposition." |
|---|
| Language: | English |
|---|
| References: | 40 |
|---|
| Note: | Pictures, b/w
Tables
Graphs |
|---|
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Raciti, S. M., P. M. Groffman, and T. J. Fahey. 2008. Nitrogen retention in urban lawns and forests. Ecol. Appl. 18(7):p. 1615-1626. |
| Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=198180 |
| If there are problems with this record, send us feedback about record 198180. |
| Choices for finding the above item: |
|---|
| Web URL(s):
http://www.jstor.org/stable/pdfplus/40062237.pdf?acceptTC=true
Last checked: 02/21/2012
Requires: PDF Reader
Access conditions: Item is within a limited-access website
http://www.jstor.org/stable/40062237
Last checked: 02/27/2012
Access conditions: Item is within a limited-access website
http://www.jstor.org/stable/info/40062237
Last checked: 03/01/2012
Access conditions: Item is within a limited-access website |
| 
MSU catalog number: b2470039a |
| Find from within TIC:
Digitally in TIC by record number. |
| Request through your local library's inter-library loan service (bring or send a copy of this TGIF record) |
