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随着土壤中添加镉量的增加,杂交苏丹草的株高明显降低,生物量显著下降。镉添加量为40mg kg土的处理,杂交苏丹草株高和地上部的生物量分别只有对照的48%和8.4%。不加镉的对照,杂交苏丹草根、茎、叶的含镉量分别为3.2,2.7,3.2μg g-1,各部位含镉量没有显著差异;而在添加镉的土壤中,则呈现出根>茎>叶的变化规律;土壤添加镉的量越大,杂交苏丹草各部位含镉量越高,当镉添加量为40mg kg-1土时,根、茎、叶的含镉量分别为451.9,132.5,79.4μg g-1。杂交苏丹草植株中镉含量与土壤中镉的添加量呈现为显著的直线正相关,镉的累积量呈现为先上升后下降的规律。
With the increase of Cd in soil, the plant height of hybrid sudan grass decreased significantly and the biomass decreased significantly. Cadmium addition was 40 mg kg soil treatment, the biomass of Sudan grass hybrid and aboveground biomass were only 48% and 8.4% of the control respectively. Cadmium content in roots, stems and leaves of hybrid Sudan was 3.2, 2.7 and 3.2 μg g-1, respectively, with no significant difference in cadmium content among the two cultivars without cadmium. However, > Stem> leaf. The greater the amount of cadmium in the soil, the higher the cadmium content in all parts of hybrid sudan grass. When the amount of cadmium added was 40 mg kg-1 soil, the cadmium content in roots, stems and leaves were 451.9, 132.5, 79.4 μg g-1. The content of cadmium in the plants of Sudan grass hybrid showed a significant linear positive correlation with the amount of cadmium in the soil, and the accumulation of cadmium showed the first increase and then the decrease.