Evidence for Transient increase of rhizodeposition following a severe defoliation of Plantago arenaria
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Evidence for Transient increase of rhizodeposition following a severe defoliation of Plantago arenaria. / Henry, Frédéric; Madsen, Mette Vestergård; Christensen, Søren.
In: Soil Biology & Biochemistry, 2007.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Evidence for Transient increase of rhizodeposition following a severe defoliation of Plantago arenaria
AU - Henry, Frédéric
AU - Madsen, Mette Vestergård
AU - Christensen, Søren
N1 - Keywords: Rhizodeposition; Defoliation; Carbon; Plantago arenaria; Microcosms
PY - 2007
Y1 - 2007
N2 - Plants are often grazed resulting in a sudden and significant removal of shoot tissue, which decreases photosynthesis and changes Callocation between within the plant. From results obtained in percolated sand it is possible to demonstrate an increase of rhizodepositionwithin few days after defoliation followed by a decrease of rhizodeposition. The aim of our study was to test if this pattern can be alsoobserved for plants grown in soil. We grew Plantago arenaria in microcosms and defoliated half of them after 45 d. Half of the defoliatedand non-defoliated microcosms were harvested 1.5 d, and the other half 8.5 d, after defoliation. We observed an increase of microbialbiomass 1.5 d after defoliation followed by a decrease assessed 8.5 d after the treatment. In parallel, soil soluble C and the metabolicquotient of the microbial biomass first decreased and then increased at the second harvest reaching values equivalent to those of the nondefoliatedtreatment. Based on these results together with results obtained in artificial soil, we conclude that the defoliation of P. arenariagrown in soil leads to a transient peak of root exudation.
AB - Plants are often grazed resulting in a sudden and significant removal of shoot tissue, which decreases photosynthesis and changes Callocation between within the plant. From results obtained in percolated sand it is possible to demonstrate an increase of rhizodepositionwithin few days after defoliation followed by a decrease of rhizodeposition. The aim of our study was to test if this pattern can be alsoobserved for plants grown in soil. We grew Plantago arenaria in microcosms and defoliated half of them after 45 d. Half of the defoliatedand non-defoliated microcosms were harvested 1.5 d, and the other half 8.5 d, after defoliation. We observed an increase of microbialbiomass 1.5 d after defoliation followed by a decrease assessed 8.5 d after the treatment. In parallel, soil soluble C and the metabolicquotient of the microbial biomass first decreased and then increased at the second harvest reaching values equivalent to those of the nondefoliatedtreatment. Based on these results together with results obtained in artificial soil, we conclude that the defoliation of P. arenariagrown in soil leads to a transient peak of root exudation.
KW - Faculty of Science
KW - Rhizodeposition
KW - Defoliation
KW - Carbon
KW - Plantago arenaria
KW - Microcosms
U2 - 10.1016/j.soilbio.2007.12.015
DO - 10.1016/j.soilbio.2007.12.015
M3 - Journal article
JO - Soil Biology & Biochemistry
JF - Soil Biology & Biochemistry
SN - 0038-0717
ER -
ID: 1794960