Research on Characteristics of Soil Clay Mineral Evolution in Paddy Field and Dry Land by XRD Spectrum
ZHANG Zhi-dan1, LI Qiao1, LUO Xiang-li1, JIANG Hai-chao1, ZHENG Qing-fu2, ZHAO Lan-po1*, WANG Ji-hong1*
1. College of Resources and Environmental Science, Cultivating Base, National Key Laboratory for Jilin Province Ecological Restoration and Ecosystem Management, Jilin Agicultural University, Changchun 130118, China 2. Analytical and Testing Center, Institute of Natural Products and Waste Utilization, Inner Mongolia University for the Nationalities, Tongliao 028000, China
Abstract：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 hydroxylated ’chlorite’ mineral would appear in saline-alkali soil in long-term cultivated paddy field. Taking into account that the physical and chemical properties of soil in paddy field were better then those in dry land, we could know that paddy field could help much improve soil structure, cultivate high-fertility soil and improve saline-alkali soil. This paper used XRD spectrum to determine the characteristics of clay minerals comprehensively, and analyzed two kinds of land use comparatively, and was a new perspective of soil minerals study.
张志丹1，李 桥1，罗香丽1，姜海超1，郑庆福2，赵兰坡1*，王继红1*. 应用XRD光谱研究水旱利用方式下盐碱土粘粒矿物演化特性[J]. 光谱学与光谱分析, 2014, 34(08): 2273-2278.
ZHANG Zhi-dan1, LI Qiao1, LUO Xiang-li1, JIANG Hai-chao1, ZHENG Qing-fu2, ZHAO Lan-po1*, WANG Ji-hong1*. Research on Characteristics of Soil Clay Mineral Evolution in Paddy Field and Dry Land by XRD Spectrum. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(08): 2273-2278.
