Salt-Water Dynamics in Soils: V. Salt Balance in Soil Profiles

摘要

Salt balance in simulated soil columns was calculated on the basis of a large amount of long term observation data. The results showed that under the climate conditions of semi-arid region of the Huang-Huai-Hai Plain, the soils in the columns were under salt accumulation conditions when the groundwater depth was controlled at less than 2.0 m, and under desalinization conditions when at larger than 2.5 m. In the soil columns with clay soil and silty loam soil intercalated with a clay layer, the amountof salt accumulated was far less than that in the soil column with silty loam soil throughout the whole profile. Under no irrigation conditions crop planting may increase groundwater evaporation and hence salt accumulation in soil, making the soil columns under desalinization be under salt accumulation conditions.