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OAS accession Detail for 0209238, meta_version: 2. Current meta_version is: 10
| accessions_id: |
0209238 | archive
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| Title: |
Saltmarsh carbon and nitrogen cycling nutrient data in two northern Gulf of Mexico saltmarsh plants from 2017-2018 (NCEI Accession 0209238) |
| Abstract: |
Salt marsh biogeochemical processes are regulated by ecosystem structure (e.g. plant community composition). However, plant-specific responses to stressors such as elevated nutrient inputs can have differing impacts on nitrogen (N) removal and carbon (C) sequestration. We conducted a field manipulation to investigate the impact of elevated nutrient loading on ecosystem C dynamics and nitrate reduction pathways (denitrification and dissimilatory nitrate reduction to ammonium (DNRA)) in plots dominated by either Juncus roemerianus or Spartina alterniflora that were collocated in a northern Gulf of Mexico salt marsh. We increased N and phosphorus (P) inputs by two- and three-times current levels in the region. Nutrient enrichment had no effect on net ecosystem exchange. However, a three-fold increase in nutrient input resulted in nearly one-third increases in gross primary productivity (GPP) and ecosystem respiration in S. alterniflora plots, whereas there was no impact in J. roemerianus plots. Denitrification increased in S. alterniflora plots 10-fold at both treatment levels relative to controls, but as with GPP, there was no response in J. roemerianus plots to higher nutrient inputs. In contrast, a three-fold increase in nutrients reduced DNRA by half in J. roemerianus plots. This work demonstrates that plant species-specific responses in marshes need to be considered for determining the impact of higher nutrient inputs on plant productivity and N-removal and retention. |
| Date received: |
20200207 |
| Start date: |
20170407 |
| End date: |
20180720 |
| Seanames: |
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| West boundary: |
-88.12407 |
| East boundary: |
88.123611 |
| North boundary: |
30.257097 |
| South boundary: |
-30.256717 |
| Observation types: |
in situ, laboratory analyses
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| Instrument types: |
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| Datatypes: |
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| Submitter: |
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| Submitting institution: |
University of Alabama |
| Collecting institutions: |
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| Contributing projects: |
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| Number of observations: |
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| Supplementary information: |
Submission Package ID: MDE7PD |
| Availability date: |
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| Metadata version: |
2 |
| Keydate: |
2020-03-09 17:40:49+00 |
| Editdate: |
2020-05-07 19:04:38+00 |