Research on characteristics of soil clay mineral evolution in paddy field and dry land by XRD spectrum

• Published in: Guang pu xue yu guang pu fen xi Vol. 34; no. 8; p. 2273
• Main Authors: Zhang, Zhi-dan, Li, Qiao, Luo, Xiang-li, Jiang, Hai-chao, Zheng, Qing-fu, Zhao, Lan-po, Wang, Ji-hong
• Format: Journal Article
• Language: Chinese
• Published: China 01.08.2014
• ISSN: 1000-0593

The present paper took the typical saline-alkali soil in Jilin province as study object, and determinated the soil clay mineral composition characteristics of soil in paddy field and dry land. Then XRD spectrum was used to analyze the evolutionary mechanism of clay mineral in the two kinds of soil. The results showed that the physical and chemical properties of soil in paddy field were better than those in dry land, and paddy field would promote the weathering of mineral particles in saline-alkali soil and enhance the silt content. Paddy field soil showed a strong potassium-removal process, with a higher degree of clay mineral hydration and lower degree of illite crystallinity. Analysis of XRD spectrum showed that the clay mineral composition was similar in two kinds of soil, while the intensity and position of diffraction peak showed difference. The evolution process of clay mineral in dry land was S/I mixture-->vermiculite, while in paddy field it was S/I mixture-->vermiculite-->kaolinite. One kind of hydro