TY  - JA
AU  - Crawford,M.
AU  - Grace,P.
AU  - Oades,J.M.
TI  - Allocation of carbon to shoots, roots, soil and rhizosphere respiration by barrel medic (Medicago truncatula) before and after defoliation
SN  - 0032-079X
PY  - 2000///
CY  - Netherlands
PB  - Springer
KW  - Carbon
KW  - AGROVOC
KW  - Carbon 13
KW  - Carbon 14
KW  - Defoliation
KW  - Legumes
KW  - Medicago truncatula
KW  - Roots
N1  - Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0032-079X; Peer review
N2  - The allocation of carbon to shoots, roots, soil and rhizosphere respiration in barrel medic (Medicago truncatulaGaertn.) before and after defoliation was determined by growing plants in pots in a labelled atmosphere in a growth cabinet. Plants were grown in a 14CO2-labelled atmosphere for 30 days, defoliated and then grown in a 13CO2-labelled atmosphere for 19 days. Allocation of 14C-labelled C to shoots, roots, soil and rhizosphere respiration was determined before defoliation and the allocation of 14C and 13C was determined for the period after defoliation. Before defoliation, 38.4% of assimilated C was allocated below ground, whereas after defoliation it was 19.9%. Over the entire length of the experiment, the proportion of net assimilated carbon allocated below ground was 30.3%. Of this, 46% was found in the roots, 22% in the soil and 32% was recovered as rhizosphere respiration. There was no net translocation of assimilate from roots to new shoot tissue after defoliation, indicating that all new shoot growth arose from above-ground stores and newly assimilated carbon. The rate of rhizosphere respiration decreased immediately after defoliation, but after 8 days, was at comparable levels to those before defoliation. It was not until 14 days after defoliation that the amount of respiration from newly assimilated C (13C) exceeded that of C assimilated before defoliation (14C)
DO  - https://doi.org/10.1023/A:1026599229920
T2  - Plant and Soil
ER  -