Prior to a Successful Phytoextraction: Pot Experiments and Field Scale Studies on the Total Removal Capacity by Garden Flowers Grown in Cadmium-contaminated Soils in Taiwan pp. 737-750
Authors: (Hung-Yu Lai, Zueng-Sang Chen, Department of Post-Modern Agriculture, MingDao University; Peetow, Changhua, Taiwan, and others)
Abstract: In Taiwan, many heavy metals (HMs)-contaminated arable soils have been founded since 1980. Agricultural irrigation system was mixed with river waste water contaminated with HM is the primary reason for the contamination of cropping lands. Soil turnover/attenuation technique, which mixes the surface 30 cm layer of contaminated soils with deeper clean soil layer, was the most popular technique to be used to dilute the HM-contaminated soils to meet the soil regulation of HM in the soil contamination site. Phytoextraction technique was also regarded as another candidate technique to remove the HMs from the HMs-contaminated sites. Seedlings of various native garden flowers of Taiwan were planted either in-situ in HM-contaminated sites or in pot experiments artificially spiked soils to investigate their tolerance and removal capacity from the sites. These sites were primary contaminated with cadmium (Cd), lead (Pb), zinc (Zn), or mixed-combined with them. The total removal of HMs plays an important role prior to conduct a successful phytoextraction and decontamination. Although some of the selected plant species can accumulate higher concentration of HM in their shoots, they are small biomass and thus just can remove little amounts of HM from the contaminated soils.