The soil of irrigated corn croplands with different farming years,in Hongsibu yang-huang irrigation area in Ningxia central profiles(degenerated desert steppe),were sampled and tested to analysis their evolution,profiles distribution,space-time correlation for the salt contents and salt ions and the basification characters in summer.During the oasisization of desert steppe,the profiles distribution of soil salt contents changed from surface-gathering,to uniformity or vibration,at last to bottom-gathering on...