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Plant and Soil

, Volume 443, Issue 1–2, pp 307–322 | Cite as

Limited carbon inputs from plants into soils in arid ecosystems: a study of changes in the δ13C in the soil-root interface

  • Pere RoviraEmail author
  • Iker Aranjuelo
  • Robert S. Nowak
  • Salvador Nogués
Regular Article
  • 142 Downloads

Abstract

Background and aims

The tracing of C assimilation and the subsequent partitioning among plant organs has been a central focus of studies utilising Free Air CO2 Enrichment (FACE) facilities. The approach makes use of the fossil origin of this carbon, which is depleted in 13C. However, there is little data for desert environments. The Nevada Desert FACE Facility (NDFF), located in the Mojave Desert, has been one of the main facilities for the study of C dynamics in arid ecosystems and how they respond to rising atmospheric CO2 concentrations. In this experiment, we studied the incorporation of fixed CO2 during the previous two years (detectable by its lower δ13C) in the soil fraction surrounding roots.

Methods

The soil was collected monthly in direct vicinity to the roots during a complete growth season, at two depths (5 and 15 cm). Soil samples were dried and fractionated by size (> 50 μm and < 50 μm) by wet sieving, and both size fractions were then analysed for the δ13C of their organic matter and their carbonates.

Results

In the coarse fraction (> 50 μm), δ13C values ranged between −1 and − 2‰ for carbonates and between −23 and − 25‰ for soil organic matter. These values did not significantly change throughout the experiment and were not affected by depth (5 or 15 cm). In contrast, δ13C values for both organic and inorganic carbon in the fine fraction (< 50 μm) were much more variable than in the coarse fraction (> 50 μm). The δ13C values for organic C ranged mostly between −20‰ and − 27‰, and were roughly maintained throughout the sampling period. For inorganic C, the δ13C values were mostly between 0‰ and − 15‰, and tended to become less negative during the course of the sampling period. Overall the effect of [CO2] on δ13C values of either organic or inorganic carbon was not significant for any experimental condition (plant species, soil depth, soil fraction).

Conclusion

Little or no signs of recently fixed CO2 (13C-depleted) were detected in the soils close to the roots, in the coarse fraction (> 50 μm), the fine fraction (< 50 μm), the organic matter, or in carbonates. This indicates a slow C turnover in the studied soils, which can result from a highly conservative use of photoassimilates by plants, including a very low release of organic matter into the soil in the form of dead roots or root exudates, and from a conservative use of available C reserves.

Keywords

Climate change Carbon cycle FACE experiments Soil organic matter turnover Carbonates Desert plants Carbon isotopes Root exudates 

Notes

Acknowledgements

The authors would like to thank the Department of Natural Resources and Environmental Science, University of Nevada for the facilities given to one of the authors (Iker Aranjuelo). The current study was partially funded by the OPTIMA project. RSN also acknowledges research support from the Nevada Agricultural Experiment Station and support for the Nevada Desert FACE Facility from U.S. Department of Energy’s Terrestrial Carbon Processes Program (DE-FG02-03ER63650, DE-FG02-03ER63651) and US DOE National Nuclear Security Administration. CTFC is a member of the CERCA net of research centres of the Catalonia autonomous government.

Supplementary material

11104_2019_4223_MOESM1_ESM.docx (44 kb)
ESM 1 (DOCX 43 kb)

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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.CEMFOR, Forest Science Centre of Catalonia (CTFC)SolsonaSpain
  2. 2.Instituto de Agrobiotecnología (IdAB)CSIC-Universidad Pública de Navarra-Gobierno de NavarraMutilva BajaSpain
  3. 3.Department of Natural Resources and Environmental ScienceUniversity of NevadaRenoUSA
  4. 4.Department of Evolutionary Biology, Ecology and Environmental Sciences, Plant Physiology Section, Faculty of BiologyUniversity of BarcelonaBarcelonaSpain

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