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- W2171765135 abstract "Current research on stable carbon isotopes of the Chinese loess is reviewed. The stable carbon isotopic composition of soil organic matter (SOM) (δ13Corg) of paleosols formed during interglacials is more positive than that within loess accumulated during glacials. Spatially, it becomes progressively more negative from the eastern Chinese Loess Plateau (CLP) to the western. However, stable carbon isotopic composition of pedogenic carbonates (δ13Ccarb) from the same sequence produces an opposing trend, both temporally and spatially, and variation differs from expectations under conditions of equilibrium. This indicates that δ13Ccarb in the Chinese loess cannot be used to reconstruct the relative proportion of C3/C4 plants in past ecological communities. Furthermore, use of δ13Ccarb to reconstruct the expansion of C4 plants in older Tertiary red clay deposits is considered unreliable. We believe δ13Ccarb may act as an indirect indicator of vegetation density, following on changes in moisture supply controlled by the intensity of the Asian Summer Monsoon, but conclude that full understanding of the paleoclimatic significance of δ13Ccarb in the Chinese loess and underlying Tertiary red clay requires better understanding of modern isotopic processes." @default.
- W2171765135 created "2016-06-24" @default.
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- W2171765135 date "2006-09-01" @default.
- W2171765135 modified "2023-09-23" @default.
- W2171765135 title "Does δ13Ccarb of the Chinese loess indicate past C3/C4 abundance? A review of research on stable carbon isotopes of the Chinese loess" @default.
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- W2171765135 doi "https://doi.org/10.1016/j.quascirev.2006.03.013" @default.
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