Abstract:

In order to investigate the restoration effect of ramie on heavy metals contaminated soils under different repair measures, a pot experiment was conducted to observe the effect of three amendment substances (organic compound fertilizer, lime and sepiolite) on biomass, chlorophyll and heavy metals cadmium and lead accumulation characteristics of ramie (Boehmeria nivea) in soils contaminated with cadmium and lead. The results showed that different amendment substances and their combination treatment could increase the chlorophyll content and a/b ratio, improve the photosynthesis, and result in a significant increase in biomass. The combination treatment of three amendments accumulated the maximum biomass, organic fertilizer and its combination with sepiolite slightly times. The accumulation levels of cadmium, lead in roots and shoots in ramie significantly reduced under different applications. Single application of lime and sepiolite processing reduced largely, both combination treatments lesser decreased, declined in at least of single organic fertilizer processing. Different modifiers could promote the raise of ramie transfer coefficient, but the increase in amplitude was not obvious. In general, single application of organic fertilizer and its combination with lime and sepiolite had better results, which could effectively reduce the content of cadmium and lead in contaminated soil, improve soil physical and chemical properties, promote the growth of ramie, and have an ideal effect of plant restoration.