杂交苏丹草(Sorghum bicolor×S.sudanense)修复DDT污染土壤效果研究

Effects of Hybrid Sudan Grass (Sorghum Bicolor × S. Sudanense) in Remediating DDT-Contaminated Soil

采用盆栽试验,研究了杂交苏丹草吸收和富集DDT的规律及其对DDT污染土壤的修复效果.结果表明:①土壤中添加高浓度的DDT,对杂交苏丹草的生物量没有显著影响,说明杂交苏丹草对DDT有耐受能力;②杂交苏丹草对DDT及其主要降解产物都有吸收,在旺盛生长期,植株中DDT的累积速率也较快;③杂交苏丹草根系中DDT及其主要降解产物的浓度是茎叶中相应组分浓度的4.81～10.32倍,质量比在0.57～1.55倍之间;④杂交苏丹草从土壤中吸收DDT占添加量的11.3%,而在其生长期间,土壤中DDT消失量为56.0%.

Pot experiments were conducted to study laws of DDT absorption and accumulation by hybrid sudan grass and effects of the grass in remediating DDT-contaminated soils. Results showed that ①no significant impact of high DDT application rate was found on biomass of hybrid sudan grass, indicating tolerance of the grass to DDT; ②the grass absorbed both DDT and its main degradation products, especially during its vegetative growth stage; ③the concentrations of DDT and its main degradation products in roots were 4.81~10.32 times as much as in shoot, and the masses were 0.57~1.55 times as much; and ④the grass absorbed 11.3% of the amount of DDT added into the soil, and soil DDT was depleted by 56.0% during the entire growing period of the grass.