关键词: 彩叶草, 彩叶草, 叶片, cDNA文库, 叶色

Abstract: Adsorption is the initial process when the exterior heavy metals enter soil, influencing directly bioavailability of metals in soil. The batch techniques were used to investigate the adsorption kinetics of cadmium (Cd) on four types of soils in Northeast China: phaeozem, saline-alkali soil, meadow albic bleached soil and dark brown forest soil. Sorption data was fitted by numbers of kinetic equations in common use. The result showed that, the process of Cd sorption on four types soils could divided into two phases: the fast phase and slow phase. Compared with high Cd concentration 16 mg L-1, there was lesser time for reaching balance of Cd sorption by soils at low Cd concentration 1.6 mg L-1. The rate and amount of Cd sorption by phaeozem, saline-alkali soil were higher than by meadow albic bleached soil and dark brown forest soil, which was more distinct in lower Cd 1.6 mg L-1. That was due to higher content of organic matter on phaeozem, higher pH value and proportion of clay components on saline-alkali soil. The optimum models were obtained by non-linear fitting to describe the kinetic processes of adsorption of Cd on four types of soils in Northeast, China. According to the results, exponential equation and exponential function equation were more appropriate to fit the kinetic process than other equations.