Distribution of soil zinc, iron, copper and manganese fractions and its relationship with plant availability

Zou, B.J.; Mo, R.C.

Pedosphere 5(1): 35-44

1995


ISSN/ISBN: 1002-0160
Accession: 002596500

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Abstract
The distribution of Zn, Fe, Cu and Mn in 15 soils in China and its relationship with plant availability were studied. Soils studied were black soil, albic soil, brown soil, carbonate meadow soil, chernozem, cinnamon soil, paddy soil, fluvo-aquic soil, dark loessial soil, calcic purplish soil, neutral purplish soil, red soil and lateritic red soil. Fractions of various elements had similar characteristic distribution regularities in various types of soils, but various soil types differed in the distribution of each fraction. Soil physicochemical properties, such as pH, CEC and the contents of OM, CaCO3, free Fe, Mn and P2O5, were significantly correlated with the distribution of elemental fractions, and a significant correlation existed between the distribution and plant availability of elemental fractions. Various fractions of each element were divided into 2 groups based on their plant availability. Group I were primary pools of available nutrients, while those in Group II could hardly provide available nutrients for plants. Decreasing the transformation of corresponding elements into fractions of Group II and increasing the storage capacity of various fractions of Group I were an important direction for regulation and control of soil nutrients. Some soils with high contents of Zn, Fe, Cu and Mn need specific control measures.