Repeated 14CO 2 pulse-labelling reveals an additional net gain of soil carbon during growth of spring wheat under free air carbon dioxide enrichment (FACE)
Publikation: Beiträge in Zeitschriften › Zeitschriftenaufsätze › Forschung › begutachtet
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in: Soil Biology and Biochemistry, Jahrgang 41, Nr. 12, 01.12.2009, S. 2422-2429.
Publikation: Beiträge in Zeitschriften › Zeitschriftenaufsätze › Forschung › begutachtet
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T1 - Repeated 14CO 2 pulse-labelling reveals an additional net gain of soil carbon during growth of spring wheat under free air carbon dioxide enrichment (FACE)
AU - Martens, Rainer
AU - Heiduk, Katja
AU - Pacholski, A.
AU - Weigel, Hans-Joachim
PY - 2009/12/1
Y1 - 2009/12/1
N2 - Rising levels of atmospheric CO 2 have often been found to increase above and belowground biomass production of C3 plants. The additional translocation of organic matter into soils by increased root mass and exudates are supposed to possibly increase C pools in terrestrial ecosystems. Corresponding investigations were mostly conducted under more or less artificial indoor conditions with disturbed soils. To overcome these limitations, we conducted a 14CO 2 pulse-labelling experiment within the German FACE project to elucidate the role of an arable crop system in carbon sequestration under elevated CO 2. We cultivated spring wheat cv. "Minaret" with usual fertilisation and ample water supply in stainless steel cylinders forced into the soil of a control and a FACE plot. Between stem elongation and beginning of ripening the plants were repeatedly pulse-labelled with 14CO 2 in the field. Soil born total CO 2 and 14CO 2 was monitored daily till harvest. Thereafter, the distribution of 14C was analysed in all plant parts, soil, soil mineral fractions and soil microbial biomass. Due to the small number of grown wheat plants (40) in each ring and the inherent low statistical power, no significant above and belowground growth effect of elevated CO 2 was detected at harvest. But in comparison to ambient conditions, 28% more 14CO 2 and 12% more total CO 2 was evolved from soil under elevated CO 2 (550 μmol CO 2 mol -1). In the root-free soil 27% more residual 14C was found in the FACE soil than in the soil from the ambient ring. In soil samples from both treatments about 80% of residual 14C was found in the clay fraction and 7% in the silt fraction. Very low 14C contents in the CFE extracts of microbial biomass in the soil from both CO 2 treatments did not allow assessing their influence on this parameter. Since the calculated specific radioactivity of soil born 14CO 2 gave no indication of an accelerated priming effect in the FACE soil, we conclude that wheat plants grown under elevated CO 2 can contribute to an additional net carbon gain in soils.
AB - Rising levels of atmospheric CO 2 have often been found to increase above and belowground biomass production of C3 plants. The additional translocation of organic matter into soils by increased root mass and exudates are supposed to possibly increase C pools in terrestrial ecosystems. Corresponding investigations were mostly conducted under more or less artificial indoor conditions with disturbed soils. To overcome these limitations, we conducted a 14CO 2 pulse-labelling experiment within the German FACE project to elucidate the role of an arable crop system in carbon sequestration under elevated CO 2. We cultivated spring wheat cv. "Minaret" with usual fertilisation and ample water supply in stainless steel cylinders forced into the soil of a control and a FACE plot. Between stem elongation and beginning of ripening the plants were repeatedly pulse-labelled with 14CO 2 in the field. Soil born total CO 2 and 14CO 2 was monitored daily till harvest. Thereafter, the distribution of 14C was analysed in all plant parts, soil, soil mineral fractions and soil microbial biomass. Due to the small number of grown wheat plants (40) in each ring and the inherent low statistical power, no significant above and belowground growth effect of elevated CO 2 was detected at harvest. But in comparison to ambient conditions, 28% more 14CO 2 and 12% more total CO 2 was evolved from soil under elevated CO 2 (550 μmol CO 2 mol -1). In the root-free soil 27% more residual 14C was found in the FACE soil than in the soil from the ambient ring. In soil samples from both treatments about 80% of residual 14C was found in the clay fraction and 7% in the silt fraction. Very low 14C contents in the CFE extracts of microbial biomass in the soil from both CO 2 treatments did not allow assessing their influence on this parameter. Since the calculated specific radioactivity of soil born 14CO 2 gave no indication of an accelerated priming effect in the FACE soil, we conclude that wheat plants grown under elevated CO 2 can contribute to an additional net carbon gain in soils.
KW - Biology
KW - FACE
KW - 14Co2
KW - pulse-labeling
KW - spring wheat
KW - carbon
KW - sequestration
KW - soil mineral fraction
KW - Priming effect
KW - Microbial biomass
UR - http://www.scopus.com/inward/record.url?scp=70350567150&partnerID=8YFLogxK
U2 - 10.1016/j.soilbio.2009.08.018
DO - 10.1016/j.soilbio.2009.08.018
M3 - Journal articles
AN - SCOPUS:70350567150
VL - 41
SP - 2422
EP - 2429
JO - Soil Biology and Biochemistry
JF - Soil Biology and Biochemistry
SN - 0038-0717
IS - 12
ER -