Long-term effects of free air CO2 enrichment (FACE) on soil respiration

被引:95
作者
Bernhardt, ES
Barber, JJ
Pippen, JS
Taneva, L
Andrews, JA
Schlesinger, WH
机构
[1] Duke Univ, Dept Biol, Durham, NC 27708 USA
[2] Montana State Univ, Dept Math Sci, Bozeman, MT 59717 USA
[3] Duke Univ, Nicholas Sch Environm & Earth Sci, Durham, NC 27708 USA
[4] Univ Illinois, Dept Biol Sci, Chicago, IL 60607 USA
[5] Locke Liddell & Sapp LLP, Houston, TX 77002 USA
关键词
carbon dioxide enrichment; Del 13a(C); Duke Forest; FACE; soil CO2; soil respiration;
D O I
10.1007/s10533-005-1062-0
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Emissions of CO2 from soils make up one of the largest fluxes in the global C cycle, thus small changes in soil respiration may have large impacts on global C cycling. Anthropogenic additions of CO2 to the atmosphere are expected to alter soil carbon cycling, an important component of the global carbon budget. As part of the Duke Forest Free-Air CO2 Enrichment (FACE) experiment, we examined how forest growth at elevated (+200 ppmv) atmospheric CO2 concentration affects soil CO2 dynamics over 7 years of continuous enrichment. Soil respiration, soil CO2 concentrations, and the isotopic signature of soil CO2 were measured monthly throughout the 7 years of treatment. Estimated annual rates of soil CO2 efflux have been significantly higher in the elevated plots in every year of the study, but over the last 5 years the magnitude of the CO2 enrichment effect on soil CO2 efflux has declined. Gas well samples indicate that over 7 years fumigation has led to sustained increases in soil CO2 concentrations and depletion in the delta C-13 of soil CO2 at all but the shallowest soil depths.
引用
收藏
页码:91 / 116
页数:26
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