Effect of Reduction Associated with Organic Matter Decomposition on Magnetic Properties of Red Soils

Five soils derived from different parent materials were sampled from red soil region of southern China and studied by magnetic methodology to understand to what extent iron reduction would affect soil magnetic properties and how iron reduction would affect the magnetic minerals in soils. Reduction associated with organic matter decomposition strongly affected soil magnetic parameters at low pH. The losses of orition (SIRM) at pH 4～6 during the two-month saturation treatment, were 66%～94%, 54%～90%, 64%～95% and 33%～83%, respectively. These changes were interpreted as a consequence of substantial dissolution of maghaemite and haematite in the soils. At pH 10, however, there was no significant magnetic change observed. Moreover, stable single domain soil maghaemite grains were also sensitive to reduction, which suggested that both pedogenic and detrital maghaemite were not stable in acid and reducing environments.Goethite, instead, was the most stable iron form under reducing conditions.

作 者： DONG RUIBIN ZHANG WEIGUO LU SHENGGAO YU LIZHONG YU JINYAN   作者單位： DONG RUIBIN(Department of Environmental Engineering, Nanchang University, Nanchang 330029 China)

ZHANG WEIGUO,YU LIZHONG(State Key Laboratory of Estuarine & Coastal Research, East China Normal University, Shanghai 200062 China)

LU SHENGGAO,YU JINYAN(College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310029 China) 

刊 名： 土壤圈(意譯名)  ISTIC SCI 英文刊名： PEDOSPHERE  年，卷(期)： 2003 13(2)  分類號： S15  關鍵詞： goethite   haematite   maghaemite   magnetic susceptibility   reduction  

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