Carbon Isotope Dynamics in Vegetation Systems
Summary
Carbon isotope dynamics in vegetation systems revolve around the distinct discrimination of 13C and 12C during photosynthesis and subsequent transfer through soil and sedimentary pools. Plants employing the C3 pathway typically discriminate more strongly against 13C, resulting in more negative δ13C values, whereas C4 plants exhibit reduced discrimination and relatively higher δ13C. Environmental variables such as atmospheric CO2 concentration, water availability, temperature and light intensity influence stomatal conductance and enzymatic carboxylation, thereby modulating carbon isotope discrimination. These isotopic signatures serve as integrative tracers, linking plant physiology to ecosystem processes and offering quantitative estimates of past vegetation composition, water‐use efficiency and climatic parameters. Advances in compound‐specific isotope analysis have enabled reconstruction of carbon fluxes at finer taxonomic or functional levels, while bulk analyses of soil organic carbon and fossil biomarkers inform on long‐term biogeochemical cycling. Together, these approaches underpin assessments of contemporary plant responses to global change and reconstructions of palaeoecological shifts, from the expansion of C4 grasslands in the Neogene to Holocene monsoon variability and modern ecosystem function.
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Carbon Isotope Dynamics in Vegetation Systems publication trend
The graph below shows the total number of articles in carbon isotope dynamics in vegetation systems across all publications each year (not limited to Nature Index journals).
Technical terms
δ13C: The ratio of 13C to 12C in a sample relative to an international standard, expressed in ‰, reflecting photosynthetic discrimination and post-photosynthetic processes.
C3 photosynthesis: A carbon fixation pathway in which CO2 is first incorporated into a three-carbon compound, generally exhibiting strong 13C discrimination.
C4 photosynthesis: A pathway that concentrates CO2 in bundle sheath cells, reducing 13C discrimination and conferring efficiency under high light, temperature or aridity.
Isotope discrimination (∆): The difference between the δ13C of atmospheric CO2 and that of plant tissue, quantifying preferential uptake of 12C over 13C during assimilation.
n-alkanes: Long-chain hydrocarbons derived from leaf waxes, used in compound-specific isotope analyses to reconstruct plant functional type and hydrological changes.
References
- Response of grassland ecosystem to monsoonal precipitation variability during the Mid-Late Holocene: Inferences based on molecular isotopic records from Banni grassland, western India. PLOS ONE (2019).
- Pliocene expansion of C4 vegetation in the Core Monsoon Zone on the Indian Peninsula. Climate of the Past (2020).
- Multiproxy records of temperature, precipitation and vegetation on the central Chinese Loess Plateau over the past 200,000 years. Quaternary Science Reviews (2022).
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