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- W70790061 abstract "We used an altitudinal gradient on the northeast flank of Mauna Kea Volcano, island of Hawaii to examine the effects of temperature on soil carbon turnover and stabilization. The gradient consists of C[sub 3] rainforest in parallel to C[sub 4] pastures converted from this forest several decades ago. Sites with little variation in rainfall or vegetation type were chosen on volcanic ash soils of similar ages. We obtained [delta][sup 13]C and [Delta][sup 14]C values for bulk soils and [delta][sup 13]C values for CO[sub 2] evolved in the field and from microbial fumigations. We constructed an isotope dilution model that uses the isotope data along with data on net primary productivity and total soil carbon to estimate relative pool sizes of highly recalcitrant [open quotes]passive[close quotes] and more labile [open quotes]non-passive[close quotes] soil carbon. Results of this model show that decomposition rates for carbon turning over at annual to decadal time scales increase with increasing temperature in a linear to saturating fashion. This response differs from the exponential relationships reported in numerous studies of litter decomposition and/or soil respiration. If soil carbon turnover as a whole is not an exponential function of temperature, then soils would be far less likely tomore » be a net source of atmospheric CO[sub 2] in a warmer climate.« less" @default.
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- W70790061 date "1993-06-01" @default.
- W70790061 modified "2023-09-23" @default.
- W70790061 title "A multi-decade history of soil carbon turnover along a temperature gradient" @default.
- W70790061 hasPublicationYear "1993" @default.
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