Abstract: In situ capping is an emerging technology for contaminated sediment remediation, and has shown its advantages of better remediation performance, less ecological risk, and lower construction and management cost over the traditional technologies such as controlled natural recovery and sediment removal. Since the late 1970s, this technology has been successfully applied in many contaminated sites in the United States, German, Japan, Australia, Norway, Canada, and other countries. With the advancement of both engineering projects and theoretical researches, in situ capping technology has been improved significantly, and especially, the development of capping materials has brought a broad and bright future for this technology. In this paper, the applications and performances of various in situ capping materials in the world during the last twenty years were reviewed and summarized, aimed to promote the application of in situ capping in China.

Key words: Winter wheat, Potassium application stage, Photosynthetic characteristic, Enzyme activity, Starch accumulation