Modeling terrestrial 13C cycling: Climate, land use and fire
作者： M. Scholze , P. Ciais , M. Heimann
DOI: 10.1029/2006GB002899
关键词:
摘要: The LPJ terrestrial carbon isotope model, which includes isotopic fractionation of 13C during assimilation and a full description the cycle, has been used to calculate atmosphere-biosphere exchange flux CO2 its δ13C for years 1901 1998. A transient, spatially explicit data set C4 crops tropical pastures compiled. In combination with land use scheme this allows analysis impact conversion C3 ecosystems cultivation, besides climate, fire disturbances, atmospheric ratio CO2, on stable composition. Globally averaged values modeled leaf discrimination vary between 11.9‰ 17.0‰ depending chosen also year simulation. Results from simulation experiment prescribing into show lowest discrimination. Modeled disequilibrium flux, caused by difference fixed released similarly depend amount prescribed vegetation 37.9 Pg C‰ yr-1 23.9 over 1985 1995. addition, effect diagnosed; generally wildfires lead reduction ≈10 because they shorten turnover time carbon. If in global double deconvolution study, differences results standard without any cultivation including could account shift about 1 C inferred sources ocean fluxes. (Less)
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