Estimating ‘rhizosphere priming effect’: Comparison of the indirect y-intercept regression approach and direct bare plot Approach

Estimating ‘rhizosphere priming effect’: Comparison of the indirect y-intercept regression... Determined the contribution of root derived CO2 efflux to total CO2 efflux (including root and non-root derived CO2 efflux) is import to grope the mechanism of CO2 efflux, however, becaused of ‘rhizoshere priming effect’ (RPE), it is difficult to achieve in practice. In this study, we attempted to estimate the RPE via comparing basal soil respiration (R b) achieved by two different methods namely, y-intercept regression and direct bare plot approach in an arid cotton field, central Asia. On the basis of the y-intercept of linear regressions between below-ground respiration (BGR) and root biomass, R b was indirectly calculated. Comparing with the first approach, the second approach involved direct measurements of soil respiration from bare plots. R b estimated by y-intercept method contained the component of RPE whereas direct bare plot did not. We found that RPE showed a phenological trend with highest value in flowering stage at 0.145 g CO2 m–2 h–1 and lowest at budding stage (0.007 g CO2 m–2 s–1), even after the data had been corrected for the influence of soil temperature. We concluded that RPE needed to be considered when R b was estimated by y-intercept approach. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Ecology Springer Journals

Estimating ‘rhizosphere priming effect’: Comparison of the indirect y-intercept regression approach and direct bare plot Approach

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Publisher
Springer Journals
Copyright
Copyright © 2016 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Ecology; Environment, general
ISSN
1067-4136
eISSN
1608-3334
D.O.I.
10.1134/S1067413616050179
Publisher site
See Article on Publisher Site

Abstract

Determined the contribution of root derived CO2 efflux to total CO2 efflux (including root and non-root derived CO2 efflux) is import to grope the mechanism of CO2 efflux, however, becaused of ‘rhizoshere priming effect’ (RPE), it is difficult to achieve in practice. In this study, we attempted to estimate the RPE via comparing basal soil respiration (R b) achieved by two different methods namely, y-intercept regression and direct bare plot approach in an arid cotton field, central Asia. On the basis of the y-intercept of linear regressions between below-ground respiration (BGR) and root biomass, R b was indirectly calculated. Comparing with the first approach, the second approach involved direct measurements of soil respiration from bare plots. R b estimated by y-intercept method contained the component of RPE whereas direct bare plot did not. We found that RPE showed a phenological trend with highest value in flowering stage at 0.145 g CO2 m–2 h–1 and lowest at budding stage (0.007 g CO2 m–2 s–1), even after the data had been corrected for the influence of soil temperature. We concluded that RPE needed to be considered when R b was estimated by y-intercept approach.

Journal

Russian Journal of EcologySpringer Journals

Published: Aug 20, 2016

References

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