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DOI: | 10.1016/S0098-8472(98)00033-1 |
Web URL(s): | http://www.sciencedirect.com/science/article/pii/S0098847298000331 Last checked: 05/30/2013 Access conditions: Item is within a limited-access website |
Author(s): | Fredeen, Arthur L.;
Koch, George W.;
Field, Christopher B. |
Author Affiliation: | Fredeen and Field: Carnegie Institution of Washington, Department of Plant Biology, Stanford, California; Koch: Department of Biological Sciences, Stanford University, Stanford, California |
Title: | Influence of fertilization and atmospheric CO2 enrichment on ecosystem CO2 and H2O exchanges in single- and multiple-species grassland microcosms |
Source: | Environmental and Experimental Botany. Vol. 40, No. 2, October 1998, p. 147-157. |
Publishing Information: | Elsevier |
# of Pages: | 11 |
Keywords: | TIC Keywords: Fertilization; Atmosphere; Carbon dioxide; Ecosystems; Grasslands; Carbon dioxide exchange rate
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Abstract/Contents: | "This paper reports on measurements of net CO2 and H2O exchange from single- and multiple-species microcosms composed of California annual grassland species grown at either ambient or elevated (ambient+36 Pa) CO2. Microcosms consisted of grassland species grown in PVC tubes (~0.95 m deep Œ 0.2 m diameter) containing ~45 kg of either serpentine or sandstone derived soil or parent material in open-top enclosures under ambient meteorological conditions. Half of the microcosms were left unfertilized (low nutrient) while the other half received an intermediate level of a slow-release (N,P,K) fertilizer (high nutrient). Gas exchange was performed by sealing individual microcosms within a transparent chamber (on clear sunny days) and coupling this to an open gas-exchange system. In fertilized single-species microcosms, elevated CO2 consistently enhanced net 'ecosystem' CO2 exchange (NCE) on a ground area basis in both early and late spring. Among unfertilized single-species microcosms, no significant trends or differences were observed in NCE between those grown at ambient versus elevated CO2. The NCE in sandstone and serpentine multiple-species microcosms was monitored seasonally over a majority of the 1993-1994 growing season. Rates were largely unaffected by growth CO2 or fertilization until after mid-February, 1994. Water-use efficiency (WUE = NCE/evapotranspiration (ET)) was generally enhanced by elevated CO2, but this was primarily a result of enhancements in NCE as opposed to decreases in ET. Enhancements in NCE by elevated CO2 in fertilized single-species microcosms at the growth-CO2 concentration were partially explained by higher above-ground biomass in elevated CO2 microcosms. However, ecosystem-level 'acclimation' occurred such that microcosms grown at elevated CO2 consistently had lower NCE than ambient CO2 treatments at a single measurement CO2 concentration (ambient or elevated). The reduction in apparent ecosystem-level photosynthetic capacity in elevated CO2 microcosms was accompanied by decreases in foliar Rubisco activity, such that NCE measured at ambient CO2 was highly correlated (r=0.98) with foliar Rubisco activity across the three single-species microcosms in which it was measured." |
Language: | English |
References: | 31 |
Note: | Tables Graphs |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Fredeen, A. L., G. W. Koch, and C. B. Field. 1998. Influence of fertilization and atmospheric CO2 enrichment on ecosystem CO2 and H2O exchanges in single- and multiple-species grassland microcosms. Environmental and Experimental Botany. 40(2):p. 147-157. |
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| DOI: 10.1016/S0098-8472(98)00033-1 |
| Web URL(s): http://www.sciencedirect.com/science/article/pii/S0098847298000331 Last checked: 05/30/2013 Access conditions: Item is within a limited-access website |
| MSU catalog number: QK 711 .A1 R3 |
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