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Contribution of Lolium perenne rhizodeposition to carbon turnover of pasture soil

Contribution of Lolium perenne rhizodeposition to carbon turnover of pasture soil Carbon rhizodeposition and root respiration during eight development stages of Lolium perenne were studied on a loamy Gleyic Cambisol by 14 CO 2 pulse labelling of shoots in a two compartment chamber under controlled laboratory conditions. Total 14 CO 2 efflux from the soil (root respiration, microbial respiration of exudates and dead roots) in the first 8 days after 14 C pulse labelling decreased during plant development from 14 to 6.5% of the total 14 C input. Root respiration accounted for was between 1.5 and 6.5% while microbial respiration of easily available rhizodeposits and dead root remains were between 2 and 8% of the 14 C input. Both respiration processes were found to decline during plant development, but only the decrease in root respiration was significant. The average contribution of root respiration to total 14 CO 2 efflux from the soil was approximately 41%. Close correlation was found between cumulative 14 CO 2 efflux from the soil and the time when maximum 14 CO 2 efflux occurred (r=0.97). The average total of CO 2 Defflux from the soil with Lolium perenne was approximately 21 μg C-CO 2 d −1 g −1 . It increased slightly during plant development. The contribution of plant roots to total CO 2 efflux from the soil, calculated as the remainder from respiration of bare soil, was about 51%. The total 14 C content after 8 days in the soil with roots ranged from 8.2 to 27.7% of assimilated carbon. This corresponds to an underground carbon transfer by Lolium perenne of 6–10 g C m −2 at the beginning of the growth period and 50–65 g C m −2 towards the end of the growth period. The conventional root washing procedure was found to be inadequate for the determination of total carbon input in the soil because 90% of the young fine roots can be lost. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant and Soil Springer Journals

Contribution of Lolium perenne rhizodeposition to carbon turnover of pasture soil

Kuzyakov, Y.; Kretzschmar, A.; Stahr, K.
Plant and Soil , Volume 213 (1) – Jun 1, 1999
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References (29)

Publisher
Springer Journals
Copyright
Copyright © 1999 by Kluwer Academic Publishers
Subject
Life Sciences; Ecology; Plant Sciences; Plant Physiology; Soil Science & Conservation
ISSN
0032-079X
eISSN
1573-5036
DOI
10.1023/A:1004566027237
Publisher site
See Article on Publisher Site

Abstract

Carbon rhizodeposition and root respiration during eight development stages of Lolium perenne were studied on a loamy Gleyic Cambisol by 14 CO 2 pulse labelling of shoots in a two compartment chamber under controlled laboratory conditions. Total 14 CO 2 efflux from the soil (root respiration, microbial respiration of exudates and dead roots) in the first 8 days after 14 C pulse labelling decreased during plant development from 14 to 6.5% of the total 14 C input. Root respiration accounted for was between 1.5 and 6.5% while microbial respiration of easily available rhizodeposits and dead root remains were between 2 and 8% of the 14 C input. Both respiration processes were found to decline during plant development, but only the decrease in root respiration was significant. The average contribution of root respiration to total 14 CO 2 efflux from the soil was approximately 41%. Close correlation was found between cumulative 14 CO 2 efflux from the soil and the time when maximum 14 CO 2 efflux occurred (r=0.97). The average total of CO 2 Defflux from the soil with Lolium perenne was approximately 21 μg C-CO 2 d −1 g −1 . It increased slightly during plant development. The contribution of plant roots to total CO 2 efflux from the soil, calculated as the remainder from respiration of bare soil, was about 51%. The total 14 C content after 8 days in the soil with roots ranged from 8.2 to 27.7% of assimilated carbon. This corresponds to an underground carbon transfer by Lolium perenne of 6–10 g C m −2 at the beginning of the growth period and 50–65 g C m −2 towards the end of the growth period. The conventional root washing procedure was found to be inadequate for the determination of total carbon input in the soil because 90% of the young fine roots can be lost.

Journal

Plant and Soil – Springer Journals

Published: Jun 1, 1999

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