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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Carbon flow in an upland grassland
T2 - Effect of liming on the flux of recently photosynthesized carbon to rhizosphere soil
AU - Rangel-Castro, J. Ignacio
AU - Prosser, Jim I.
AU - Scrimgeour, Charlie M.
AU - Ostle, Nick
AU - Ineson, Phil
AU - Meharg, Andy
AU - Killham, Ken
PY - 2004/12/1
Y1 - 2004/12/1
N2 - The effect of liming on the flow of recently photosynthesized carbon to rhizosphere soil was studied using 13CO2 pulse labelling, in an upland grassland ecosystem in Scotland. The use of 13C enabled detection, in the field, of the effect of a 4-year liming period of selected soil plots on C allocation from plant biomass to soil, in comparison with unlimed plots. Photosynthetic rates and carbon turnover were higher in plants grown in limed soils than in those from unlimed plots. Higher δl3C%0 values were detected in shoots from limed plants than in those from unlimed plants in samples clipped within 15 days of the end of pulse labelling. Analysis of the aboveground plant production corresponding to the 4-year period of liming indicated that the standing biomass was higher in plots that received lime. Lower δ13C% 0 values in limed roots compared with unlimed roots were found, whereas no significant difference was detected between soil samples. Extrapolation of our results indicated that more C has been lost through the soil than has been gained via photosynthetic assimilation because of pasture liming in Scotland during the period 1990-1998. However, the uncertainty associated with such extrapolation based on this single study is high and these estimates are provided only to set our findings in the broader context of national soil carbon emissions.
AB - The effect of liming on the flow of recently photosynthesized carbon to rhizosphere soil was studied using 13CO2 pulse labelling, in an upland grassland ecosystem in Scotland. The use of 13C enabled detection, in the field, of the effect of a 4-year liming period of selected soil plots on C allocation from plant biomass to soil, in comparison with unlimed plots. Photosynthetic rates and carbon turnover were higher in plants grown in limed soils than in those from unlimed plots. Higher δl3C%0 values were detected in shoots from limed plants than in those from unlimed plants in samples clipped within 15 days of the end of pulse labelling. Analysis of the aboveground plant production corresponding to the 4-year period of liming indicated that the standing biomass was higher in plots that received lime. Lower δ13C% 0 values in limed roots compared with unlimed roots were found, whereas no significant difference was detected between soil samples. Extrapolation of our results indicated that more C has been lost through the soil than has been gained via photosynthetic assimilation because of pasture liming in Scotland during the period 1990-1998. However, the uncertainty associated with such extrapolation based on this single study is high and these estimates are provided only to set our findings in the broader context of national soil carbon emissions.
KW - C13
KW - Carbon pools
KW - Carbon turnover
KW - Liming
KW - Rhizosphere soil
KW - Upland grassland
U2 - 10.1111/j.1365-2486.2004.00883.x
DO - 10.1111/j.1365-2486.2004.00883.x
M3 - Journal article
AN - SCOPUS:10944225018
VL - 10
SP - 2100
EP - 2108
JO - Global Change Biology
JF - Global Change Biology
SN - 1354-1013
IS - 12
ER -