Organic structure and possible origin of ancient charred paddies at Chuodun Site in southern China |
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| Authors: | LinChao Hu Xia Li BenDing Liu Min Gu JingYu Dai |
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| Institution: | (1) College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China;(2) National Laboratory of Solids State Microstructures, Department of Physics, Nanjing University, Nanjing, 210093, China |
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| Abstract: | A number of ancient charred paddies with a 14C dating of about 5900 a BP were recovered in the sixth excavation at Chuodun Site and are assigned to the Majiabang culture
(7–6 ka BP). To understand their formation mechanism, the ancient charred paddies were compared to modern paddies using FT-IR
spectrum and thermaogravimetric analysis. At the same time, modern charred paddies were made in helium by the laboratory method,
and the structural characteristics of them and the ancient ones were revealed using CP/MAS-13C-NMR. Our results show there are more aromatic moieties in ancient charred paddies compared to modern paddies. The aliphatic
components of modern charred paddies decrease continuously, accompanied by the accumulation of aromatic components, when the
duration and temperature of oxidation increase, and the structure buildings of modern charred paddies are more similar to
ancient ones. Given the planting manner of paddies during Majiabang culture period, these ancient charred paddies might be
a result of the original farming mode involving fire.
Supported by the National Natural Science Foundation of China (Grant No. 40571088) |
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| Keywords: | ancient charred paddies FT-IR TGA CP/MAS-13C-NMR formation mechanism |
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