Effect Of Cadmium Pollution On The Growth Of Energy Crops

Using several energy plants, i.e. oats wheat, rape, maize and sweet sorghum, this study carries out pot experiments about the tolerance of ecological physiology in different soil conditions contaminated by gradient concentrations of cadmium. The results show that:(1) Generally speaking, oat, wheat and maize are more tolerant to Cd, and all the indices including plant height, biomass, seed kernel weight, and number of effective tillers show that lower Cd concentration benefits the growth of plants and higher concentration contrains the growth; Sweet sorghum is sensitive and its growth reduces when cadmium concentration increases; high pollution concentration of cadmium inhibit the growth of rapeseed, but the concentrations of cadmium are highly volatile between individual samples. (2) It is correlated between crop net photosynthetic rate, light parameters, fluorescence parameters and the individual growth parameters, but the trend is not obvious in every growth period. (3) Cd accumulates mainly in the roots. Based on factors such as bioaccumulation and translocation, rapeseed has a potential of hyperaccumulation. This study has significance to both theory and practice on energy plants remediating cadmium contaminated soil.