Abstract
Soil samples were collected from eight basaltderived chronosequence soils with the ages of 0.01, 0.58, 0.92, 1.33, 2.04, 3.04, 3.76 and 6.12 Ma respectively from Leizhou Peninsula and northern Hainan Island of tropical southern China. Magnetic parameters of magnetic susceptibility (MS), percentage of frequency-dependent magnetic susceptibility (FDS%), anhysteretic remanent magnetization (ARM), saturation isothermal remanent magnetization (SIRM), soft and hard isothermal remanent magnetization (IRMs and IRMh) of the collected samples were measured to study the evolution and the significance of the magnetism with soil age. The results show that the magnetic parameters changed fast from Primosols to Ferrosols (0.01 - 0.92 Ma) but slowly at Ferralosols stage (1.33 Ma~), it suggests a stable phase occurred for soil magnetism at Ferralosols, the existence of this phase could be supported by the little changes in the contents of clay, Fet and Fed. Obvious differences existed in the values of magnetic parameters between Ferralosols and other soil types (Primosols and Ferrosols), FDS%: Ferralosols > 10%, Primosols and Ferrosols 8000 × 10 –8 SIm 3 ·kg –1
Highlights
Soil chronosequences, given that the other soil-forming factors are similar, are often used to demonstrate the relative degree of soil development under varying duration of soil formation [1]
Particle size distribution (PSD) of clay fraction obtained by the pipette method was measured by laser diffraction (LD) method: soil samples were sieved by 2 mm mesh size after air-dried at room temperature, the organic matter was removed with 6% H2O2, carbonate removed with 0.2 mol·L–1 HCl, Ca2+ and chlorides removed with 0.05 mol·L–1 dilute HCl and distilled H2O
From magnetic susceptibility (MS) change from C to BC to B to A horizons it can be found that pedogenic process can enhance MS of basalt-derived soils as others have found it
Summary
Given that the other soil-forming factors are similar, are often used to demonstrate the relative degree of soil development under varying duration of soil formation [1]. Studies have proved that different soil types may be formed from the same parent material in a region with the continuation of the weathering process, for examples, the systematical studies of soil development in Hawaii by Kennedy et al [2], Chadwick et al [3,4], Kurtz et al [5] and Derry et al [6] and in northern Hainan Island by Huang and Gong [7], Huang et al [8,9] and Zhang et al [10]. As Huang et al [9] disclosed that basalt-derived soils in the tropical Leizhou Peninsula and Hainan Island of south China can develop gradually from Primosols into ferralic-horizon characterized Ferralosols [15], so here we collected chronosequence samples of basalt-derived soils in this region in 2007 to explore the possible significance of magnetic parameters in identifying soil types by studying the evolution of soil magnetism
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