Pedosphere 2(3): 219--235, 1992
ISSN 1002-0160/CN 32-1315/P
©1992 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Salt-Water Dynamics in Soils: Ⅰ. Salt-Water Dynamics in Unsaturated Soils Under Stable Evaporation Condition
YOU WEN-RUI, MENG FAN-HUA, XIAO ZHEN-HUA, OUYANG LI
Institute of Soil Science, A cademia Sinica, P.O. Box 821, Nanjing 210008
ABSTRACT
      A long term simulation test on salt-water dynamics in unsaturated soils with different groundwater depths and soil texture profiles under stable evaporation condition was conducted. Salinity sensors and tensiometers were used to monitor salt and water variation in soils. The experiment revealed that in the process of fresh groundwater moving upwards by capillary rise in the column, the salts in subsoil were brought upwards and accumulated in the surface soil, and consequently the salinization of surface soil took place. The rate of salt accumulation is determined mainly by the volume of capillary water flow and the conditions of salts contained in the soil profile. Water flux in soils decreased obviously when groundwater depths fell below 1.5 m. When there was an interbedded clay layer 30 cm in thickness in the silty loam soil profile or a clay layer 100 cm in thickness at the top layer, the water flux was 3-5 times less than in the soil profile of homogeneous silty loam soil.
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Citation: You, W. R., Meng, F. H., Xiao, Z. H. and Ouyang, L. 1992. Salt-Water Dynamics in Soils: Ⅰ. Salt-Water Dynamics in Unsaturated Soils Under Stable Evaporation Condition. Pedosphere. 2(3): 219-235.
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