Soil salinization is the most important factor affecting the vegetation development

and the second salinization has influenced the development of oasis agriculture. In arid areas the spatial variability of soil moisture and salt content is influenced by ground water markedly

as well as unconscionable irrigation in artificial oasis. By analyzing the soil moisture

salt content and ground water level in different place of Fukang old oases

new oases and desert

the result shows: when undisturbed by human; the ground water level rises from mountain to belt of ground water spillage; the ground water level rises mightily in plain because of the artificial irrigation; and the second salinization of soil is very serious. In oasis the level of ground water rises compared with that in the same latitude place of natural vegetation. In old oasis at the upperreaches of river the soil salt content is not very high because this place is the belt of ground water leakage

soil texture is coarse

and the ground water is very low

therefore the place is the belt of salt wash and the soil salt is washed into the ground water. The new oasis becomes the place of salt accumulation because of the artificial irrigation. The soil salt content is higher than in old oasis. Many plowland has to be thrown aside because of the serious second salinization.