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Soil salinization control and sustainable agriculture in north-west endoland region of China

JIA Huixian (Gansu Agricultural University,Lanzhou 730070,China)  
There are large amount of salinized soil in northwest region.Salinization is a main reason that cause a bad ecological environment and prevent to develop sustainable agriculture.The reasons for salinization is variable.Because salinity soil have characteis such as intensified salinity degree,complicated salt contents,weak rain off saltwashing off,obvious salt surface concentration,second salinity distributed more often and water movement unable to take away the salinity in the soil.So it is more hard to prevent salinization inland than in areas near sea.After 20 years of studies,we have taken a biological approach involving planting special salt tolerant crops,through which take away salt increase greencoverd areas as to prevent salts up to the subsoil,therefore to improve soil production efficiently.Mean while,we insist on study.mechanic of plant saltresist and measures about how to use of these plants so that a practical and theoretical basement of salinization prevention was founded.Also models of "grass industry in salinized areas" and "medical plants industry in salinized areas" are presented,this be sure to lead to obvious ecological,social and ecological efficiency of sustained agriculture in salinized areas in northwest China.
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