Characterization of Gleyization of Paddy Soils in the Middle Reaches of the Yangtze RiverEnglish Full Text

PAN SHUZHENG(Institute of Soil Science,Acodemia Silica,Nanjing 210008 China)

Abstract: The gleyisation of representative paddy soils in the middle reaches of the Yangtze caver was characterized,taking oxidation-reduction potential（Eh）,the amount of active reducing substances and the forms of iron and manganese as the parameters.The Eh value was linearly related with the logarithm of the amount of active reducing substances, which was contributed by ferrous iron by 83% on an avers.The degree of gleyization of dament horizons was graded as ungleyed,slightly gleyed,mildly gleyed and gleyed.The Eh of the four grades was＞500,300-500,100-300 and＜100 mV,respectively, and the corresponding amoks of active reducing substances was＜1,1-7,7-30 and＞30 mmol.kg（-1）,respectively.The amount of ferrous iron of the four grades was＜0.5,0.5-5,5-25 and ＞ 25 mmol kg-1,respectively.The extent of gleyisation of a soil was classified as upper-gleyed, middle-gleyed and lower-gleyed, depending on whether the depth of the gley horbon was less than 30 cm,30-60 cm or more than 60 cm.

Keywords：

ferrous iron; gleyization; paddy soil; reducing substances; oxidation-reduction potential;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S155

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Characterization of Gleyization of Paddy Soils in the Middle Reaches of the Yangtze RiverEnglish Full Text

PAN SHUZHENG(Institute of Soil Science,Acodemia Silica,Nanjing 210008 China)

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