Abstract: Soil is an important medium in which various organic pollutants can exist,while photodegradation is an effective abiotic transformation means for organic pollutants in surface soil.To better understand the environmental behaviors of soil-bound pollutants,it is meaningful to investigate the photodegradation of organic pollutants in surface soil.Many researches on this aspect have been made since 1990s.This paper discussed the effects of soil factors,e.g.,composition,texture,moisture,pH,and depth on photodegradation,and described the methods and dynamic models applied in photodegradation researches,e.g.,direct photodegradation of organic compounds in surface soil,photodegradation of organic compounds in soil solution,and solvent washing and subsequent photodegradation.The photodegradation of pesticides and other organic pollutants in soil was also reviewed,and the prospects of future research were analyzed.

Key words: Oryza sativa, Root exudate, Allelopathy, Allelochemicals