Shoop S A,Bigl S R.Moisture migration during freeze and thaw of unsat-urated soils:modeling and large scale experiments[J].Cold Regions Sci-ence and Technology,1997,25:33-45.
Alloway B J.Soil processes and the behavior of heavy metals[M]//Heavy metals in soils,(Seeond Edition)(Alloway B J,ed.) Blackie,New York.1995.11-37.
[7]
Brummer R S,Gerth J,Tiller G.Reaction kinetics of the adsorption of nickel,zine,and cadmium by goethite:Ⅰ.Adsorption and diffusion of metals[J].Journal of Soil Science,1988,23:134-142.
El-Falaky A A,Aboulreos S A,Lindsay W L.Measurement of cadmium activities in slightly acidic to alkaline soil[J].Science Society of America Journal,1991,55:974-979.
[15]
Benjamin M M,Leckie J O.Multiple-site adsorption of Cd,Cu,Zn and Pb on amorphous iron oxyhydroxide[J].Journal of Colloid lnterface Sci-ence,1981,79:209-221.
[16]
Hassink J.Effects of soil texture and structure on carbon and nitrogen mineralization in grassland soils[J].Biology and Fertility of Soils,1992,14:126-134.
[17]
Sehimel J P,Clein J S.Microbial response to freeze-thaw cycles in tundra and taiga soils[J].Soil Biology and Biochemistry,1996,28:1061-1066.
[18]
Wang Z,Delaune R D,Masschelegn P H,et al.Soil redox and pH ef-fects on methane production in a flooded rice soil[J].Soil Science So-ciety of America Journal,1993,57:382-385.
[19]
Groeneweg J,Sellner B,Tappe W.Ammonia oxidation in nitrosomonas at NH3 concentrations near Km:effects of pH and temperature[J].Water Research,1994,28(12):2561-2566.
