Structural properties of plant charred materials in Andosols as revealed by X-ray diffraction profile analysis
Article first published online: 13 DEC 2010
© 2010 Japanese Society of Soil Science and Plant Nutrition
Soil Science & Plant Nutrition
Volume 56, Issue 6, pages 793–799, December 2010
How to Cite
SULTANA, N., IKEYA, K., SHINDO, H., NISHIMURA, S. and WATANABE, A. (2010), Structural properties of plant charred materials in Andosols as revealed by X-ray diffraction profile analysis. Soil Science & Plant Nutrition, 56: 793–799. doi: 10.1111/j.1747-0765.2010.00520.x
- Issue published online: 13 DEC 2010
- Article first published online: 13 DEC 2010
- Received 28 March 2010. Accepted for publication 12 October 2010.
- black carbon;
- carbon-layer plane;
- condensed aromatic structure;
- X-ray diffraction
Charred plant fragments are frequently observed in soil. However, their structure has not been elucidated. In the present study, charred plant fragments detached from soil by HF treatment and collected by heavy liquid separation were characterized by X-ray diffraction (XRD) analysis. Three Andosols from the northeastern, central and western districts of Japan were used. Supportive information was obtained by solid-state 13C nuclear magnetic resonance (NMR) and δ13C analyses. In the XRD analysis, the size of the carbon (C)-layer planes in the charred plant fragments ranged from 0.96 to 1.92 nm, corresponding to 14–52 ring condensed aromatic structures. The size distribution of the C-layer planes did not differ largely among the three soils. A minor effect of vegetation on the composition of the condensed aromatic structures in the plant charred fragments was deduced from differences in the content of the 1.92 nm C-layer plane and δ13C. The relative content of condensed aromatic structures tended to be larger in the sample with more aromatic C content, which suggested that decomposition of aliphatic moieties is a cause of enrichment of condensed aromatic structure.