NDLI: $^{13}$C isotope fractionation during rhizosphere respiration of C$_{3}$ and C$

Content Provider	Springer Nature Link
Author	Zhu, Biao Cheng, Weixin
Copyright Year	2011
Abstract	Stable carbon isotopes are used extensively to partition total soil CO$_{2}$ efflux into root-derived rhizosphere respiration or autotrophic respiration and soil-derived heterotrophic respiration. However, it remains unclear whether CO$_{2}$ from rhizosphere respiration has the same δ$^{13}$C value as root biomass. Here we investigated the magnitude of $^{13}$C isotope fractionation during rhizosphere respiration relative to root biomass in six plant species. Plants were grown in a carbon-free sand-perlite medium inoculated with microorganisms from a farm soil for 62 days inside a greenhouse. We measured the δ$^{13}$C value of rhizosphere respiration using a closed-circulation 48-hour CO$_{2}$ trapping method during 40~42 and 60~62 days after sowing. We found a consistent depletion in $^{13}$C (0.9~1.7‰) of CO$_{2}$ from rhizosphere respiration relative to root biomass in three C$_{3}$ species (Glycine max L. Merr., Helianthus annuus L. and Triticum aestivum L.), but a relatively large depletion in $^{13}$C (3.7~7.0‰) in three C$_{4}$ species (Amaranthus tricolor L., Sorghum bicolor (L.) Moench and Zea mays L. ssp. mays). Overall, our results indicate that CO$_{2}$ from rhizosphere respiration is more $^{13}$C-depleted than root biomass. Therefore, accounting for this $^{13}$C fractionation is required for accurately partitioning total soil CO$_{2}$ efflux into root-derived and soil-derived components using natural abundance stable carbon isotope methods.
Starting Page	277
Ending Page	287
Page Count	11
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	342
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-01-07
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Isotope discrimination Rhizosphere respiration Soil respiration partitioning C$_{3}$ plants C$_{4}$ plants Ecology Plant Physiology Soil Science & Conservation Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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