关键词: 冲积扇, 土壤风化, 土壤特性参数, 次生矿物, 广东

Abstract: Soil-forming factors are involved in original rocks, climate, living things, topography and time. If we wish to ascertain accurately the soil-forming time, all remaining factors must be be kept constant. The physical parameters of any soil are related to time. The authors have established a regression equation and correlation coefficients between characteristic parameters and formation time of soil layer B_ms on the alluvial fan in Heyuan area, Guangdong. The age of third-step alluvial fan has been determined by using growth rate of secondary minerals. A chronosequence cf the soil development of the alluvial fan has been set up in Heyuan area, Guangdong.

Key words: Alluvial fan, Werthering soil, Characteristic parameters, Secondary minerals, Guangdong