Study
Carbon flow in the rhizosphere: carbon trading at the soil–root interface
Jones, David L.; Nguyen, Christophe; Finlay, Roger D.
Plant and Soil, 2009
Reviews the quantity, composition and fate of carbon released by roots — passive diffusion of low-molecular-weight solutes, active secretion, mucilage, sloughed cells and root turnover — and the microbial response to it.
- Studied in
- Plantae, Bacteria, Fungi
- Sample size
- review of rhizodeposition measurements and mechanisms
A substantial share of photosynthetically fixed carbon is released below ground by several distinct processes, of which passive leakage along a concentration gradient is a major one. Microbial abundance and activity are strongly elevated near roots, and much released carbon is rapidly consumed.
What it means
The authors' reading, and ours. Where they differ, that difference is the point.
How the authors put it
Rhizodeposition comprises mechanistically distinct processes with different controls, not a single regulated secretion.
How NatureHQ reads it
The record that keeps the rhizosphere honest. Roots are leaky: they sit in a soil solution far more dilute than their own contents, and small molecules diffuse out because of that gradient rather than because anything decided to release them. Some exudation is genuinely active and targeted. Collapsing the two into "plants feed microbes" attributes intention to a process that is substantially physics.
- Measuring rhizodeposition in undisturbed soil is extremely difficult, and many estimates come from simplified systems.
- Separating passive leakage from active secretion in the field remains largely unresolved.
What this study is used for on NatureHQ
One study can inform several subjects. Here is everywhere this one is cited.
Published by: Springer journalsPublished in a Springer journal.
doi.org/10.1007/s11104-009-9925-0
Checked against Crossref on 2026-09-28, and they agree on the title, the authors and the year.
NatureHQ summarises research in its own words and does not reproduce published text. Reviewed 2026-09-04.