Salt-Water Dynamics in Soils: IV. Changes of Ionic Composition in Soil Profiles During Water Evaporationand InfiltrationEnglish Full Text

MENG FAN-HUA and YOU WEN-RUI(Institute of Soil Science, Academia Sinica, P.O. Box 821, Nanjing 210008 (China))

Abstract: Through a simulation test carried out with soil columns （61.8 cm in diameter）, the changes of ioniccomposition in soil profile during the processes of water evaporation and infiltration were studied. Underevaporation conditions, ions moving upward with fresh groundwater were mainly Cl￣-, SO, Ca￣（2+）, andNa￣+. When the mineralized groundwater took part in the salt accumulation, the ionic composition in soilswas close to that in ground water supplemented. Under rainfall infiltration conditions, the salt-leaching roleoccurred mainly in the top soil. With the decrease of total salt content, NO and Cl￣- reduced rapidly, SOdecreased slowly, but HCO had a little change only. Among cations, Na￣+ and Ca￣（2+） contents lowered atthe same speed, and Mg ￣（2+） decreased slowly.

Keywords：

ion composition; salt-water dynamics; water evaporation; water infiltration;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S153

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Salt-Water Dynamics in Soils: IV. Changes of Ionic Composition in Soil Profiles During Water Evaporationand InfiltrationEnglish Full Text

MENG FAN-HUA and YOU WEN-RUI(Institute of Soil Science, Academia Sinica, P.O. Box 821, Nanjing 210008 (China))

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