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The influence of atmospheric CO2 enrichment on plant-soil nitrogen interactions in a wetland plant community on the Chesapeake Bay

The influence of atmospheric CO2 enrichment on plant-soil nitrogen interactions in a wetland... We investigated plant and soil nitrogen pools and soil processes in monospecific stands of the C 3 sedge Scirpus olneyi and the C 4 grass Spartina patens grown in the field in open top chambers in a brackish marsh on the Chesapeake Bay. Stands of S. olneyi responded to eight years of elevated CO 2 , by increased rates of net ecosystem gas exchange and a large stimulation of net ecosystem production. We conducted our study in the summer of 1994 and 1995 when soil cores were collected and aboveground biomass was estimated. Nitrogen concentration in elevated CO 2 treatments was reduced 15% in stems of S. olneyi and 8% in the upper 10 cm of the soil profile. While total plant nitrogen per unit of land area remained the same between treatments, total soil nitrogen showed a non-significant tendency to decrease in the upper 10 cm of the soil profile in elevated CO 2 both years of study. A significant decrease in soil bulk density largely contributed to the observed decrease in soil nitrogen. Exchangeable nitrogen and potential denitrification rates were also reduced in elevated CO 2 , but net nitrogen mineralization was unchanged by elevated CO 2 treatment in S. olneyi both years. Plants and soils in a pure stand of the C 4 grass, S. patens, showed none of these effects of elevated CO 2 treatment. Our data provides evidence of changes in nitrogen dynamics of an ecosystem exposed to elevated CO 2 for eight years; however due to the variability in these data, we cannot say if or how these changes are likely to impact the effect of rising CO 2 on primary production or carbon accumulation in this ecosystem in the future. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant and Soil Springer Journals

The influence of atmospheric CO2 enrichment on plant-soil nitrogen interactions in a wetland plant community on the Chesapeake Bay

Plant and Soil , Volume 210 (1) – Mar 1, 1999

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References (40)

Publisher
Springer Journals
Copyright
Copyright © 1999 by Kluwer Academic Publishers
Subject
Environment; Ecology; Plant Sciences; Plant Physiology; Soil Science & Conservation
ISSN
0032-079X
eISSN
1573-5036
DOI
10.1023/A:1004690220705
Publisher site
See Article on Publisher Site

Abstract

We investigated plant and soil nitrogen pools and soil processes in monospecific stands of the C 3 sedge Scirpus olneyi and the C 4 grass Spartina patens grown in the field in open top chambers in a brackish marsh on the Chesapeake Bay. Stands of S. olneyi responded to eight years of elevated CO 2 , by increased rates of net ecosystem gas exchange and a large stimulation of net ecosystem production. We conducted our study in the summer of 1994 and 1995 when soil cores were collected and aboveground biomass was estimated. Nitrogen concentration in elevated CO 2 treatments was reduced 15% in stems of S. olneyi and 8% in the upper 10 cm of the soil profile. While total plant nitrogen per unit of land area remained the same between treatments, total soil nitrogen showed a non-significant tendency to decrease in the upper 10 cm of the soil profile in elevated CO 2 both years of study. A significant decrease in soil bulk density largely contributed to the observed decrease in soil nitrogen. Exchangeable nitrogen and potential denitrification rates were also reduced in elevated CO 2 , but net nitrogen mineralization was unchanged by elevated CO 2 treatment in S. olneyi both years. Plants and soils in a pure stand of the C 4 grass, S. patens, showed none of these effects of elevated CO 2 treatment. Our data provides evidence of changes in nitrogen dynamics of an ecosystem exposed to elevated CO 2 for eight years; however due to the variability in these data, we cannot say if or how these changes are likely to impact the effect of rising CO 2 on primary production or carbon accumulation in this ecosystem in the future.

Journal

Plant and SoilSpringer Journals

Published: Mar 1, 1999

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