Characteristics of salinization of saline soil in west coast area of Bohai gulf are closely related to ground elevation of plain

climate conditions

physical and hydrological properties of soil

mineralization of groundwater

and people’s actions. So far as degree of salinization

it has been investigated that salt content of soil in higher elevation position is more than that in lower elevation position; salt content of soil in upper level point is more than that in lower level point; and the effective depth of salinization of soil above groundwater table is about one meter because of evaporation and rainfall. In pace with weather change

saline soil in inshore area shows some characteristics

such as salt accumulation in top soil in spring because of evaporation; and salt moving down in summer because of rainfall. With an increase of depth

salt content of soil decreases slowly in vertical direction

but salt content raise slightly near groundwater table; and the grade of salinization of soil is classified into three kinds of sections of salt content from ground surface to groundwater table; i.e. evaporation and salt accumulation section

changeable salt content section

and salt solution section. In horizontal direction

i.e. toward the coastal line of Bohai gulf

the soil changes gradually from slight salinization to high salinization via moderate salinization

and salt content and degree of salinization of soil is more and more obvious. Degree of salinization of top soil is serious at the condition of a sallow groundwater table and more mineralization of groundwater.