Changes in leaf Delta13C of herbarium plant species during the last 3 centuries of CO2 increase

Autor:	J. Peñuelas, Joaquín Azcón-Bieto
Rok vydání:	1992
Předmět:	Mediterranean climate Stomatal conductance δ13C Physiology Plant Science Biology Photosynthesis chemistry.chemical_compound Herbarium chemistry Carbon dioxide Botany Plant species Water-use efficiency
Zdroj:	Plant, Cell and Environment. 15:485-489
ISSN:	1365-3040 0140-7791
DOI:	10.1111/j.1365-3040.1992.tb01000.x
Popis:	Δ13C were determined for herbarium specimens of 12 C3 plants (trees, shrubs and herbs) collected during the last 240 years in Catalonia, an area with a Mediterranean climate. Values were 19.91 (S.E. = 0.32, n= 21) for 1750–1760, 19–86 (S.E. = 0.21, n= 49) for 1850–1890 and 19.95 (S.E. = 0.29, n= 25) for 1925–1950, and decreased significantly to 18.87 (S.E. = 0.31, n= 29) for 1982–1988. More irregular temporal changes were found in Δ13C of two C4 species, but they also suggest a decrease in discrimination in recent decades. These results suggest that either carbon assimilation rates have increased or stomatal conductance has decreased, and therefore, that there has been an increase in water use efficiency over the last few decades.
Databáze:	OpenAIRE
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