1. State Key Laboratory of Loess and Quaternary Geology, IEE, Chinese Academy of Sciences, Xi'an 710075, China 2. Northwest Sci-Tech University of Agriculture and Forest, Yangling 710000, China
Abstract:
The relationship between the carbon isotopic composition of paleosols and pale-ovegetation on the Loess Plateau is still unclear.
One of the main reasons is that we are short of knowledge about the characteristics of the carbon isotopic composition of
modern soil in this area. A preliminary investigation of the carbon isotopic compositions of the modern soil and the loess/paleosol
sequence on the Loess Plateau shows that the carbon isotopic composition of modern soil is consistent with the distribution
of modern plants on the Loess Plateau, where the ecosystem is dominated by a mixture of C4 and C3 plants. Comparing the δ 13C values of modern soil and loess-paleosol sequences from the Xunyi profile, we conclude that C3 plants dominated the landscape during loess sediment stages, while C4 plants expanded during paleosol stages.