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Using stable isotopes to determine soil carbon input differences under ambient and elevated atmospheric CO 2 conditions
Author(s) -
NITSCHELM JENNIFER,
LÜSCHER ANDREAS,
HARTWIG UELI,
VAN KESSEL CHRIS
Publication year - 1997
Publication title -
global change biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.146
H-Index - 255
eISSN - 1365-2486
pISSN - 1354-1013
DOI - 10.1046/j.1365-2486.1997.00107.x
Subject(s) - trifolium repens , carbon dioxide , soil carbon , environmental chemistry , chemistry , isotopes of carbon , biomass (ecology) , carbon fibers , δ13c , soil water , stable isotope ratio , environmental science , agronomy , total organic carbon , soil science , biology , materials science , physics , organic chemistry , quantum mechanics , composite number , composite material
Quantitative estimates of soil C input under ambient (35 Pa) and elevated (60 Pa) CO 2 ‐partial pressure (pCO 2 ) were determined in a Free‐Air Carbon dioxide Enrichment (FACE) experiment. To facilitate 13 C‐tracing, Trifolium repens L. was grown in a soil with an initial δ 13 C distinct by at least 5‰ from the δ 13 C of T. repens grown under ambient or elevated pCO 2 . A shift in δ 13 C of the soil organic C was detected after one growing season. Calculated new soil C inputs in soil under ambient and elevated pCO 2 were 2 and 3 t ha –1 , respectively. Our findings suggest that under elevated CO 2 conditions, soil C sequestration may be altered by changes in plant biomass production and quality.