作　　者： ; ; ; ;

机构地区： 南京农业大学资源与环境科学学院环境工程系

出　　处： 《环境科学》 2006年第9期1884-1888,共5页

摘　　要： 水培小麦试验研究了水溶性有机物(DOM)对植物吸收多环芳烃(菲)的影响,并对其机制进行了初步探讨.结果表明:菲抑制了植物的生长,抑制率达到18.01%,DOM可加剧菲对植物生长的抑制作用,使生长抑制率升至24.38%;植物可吸收和富集水培液中的菲,而DOM能明显地促进植物对菲的吸收和富集作用,使得其根部浓缩系数高达37.63 L.kg-1,同时DOM还能促进根部吸收的菲向地上部转运;植物在吸收菲的同时,使得营养介质的pH显著升高,DOM与菲存在显著的协同交互作用,可使介质pH值的升高超过1个单位,似表明植物对菲的吸收以与H+形成共运对的方式进行.小麦对多环芳烃菲的吸收与无机养分的吸收之间存在协同效应,且DOM可促进这种协同效应.本研究的结果说明,DOM对多环芳烃(菲)的吸收及其环境生态效应有重要影响. Hydroponic assays were conducted to investigate the influence of dissolved organic matter on uptake of phenanthrene by wheat as well as its mechanisms. The results showed that, under hydroponic condition, phenanthrene impairment of plant growth occurred with wheat growth inhibited rate of 18.01%. The impairment would be greatly enhanced in the presence of dissolved organic matter （DOM） derived from pig manure, and the inhibited rate increased to 24.38%. Wheat could uptake and accumulate phenanthrene in the nutrient solution, which could be escalated by DOM, as indicated by wheat root bioconcentration factor being increased to 37.63 L·kg^-1 in the presence of DOM from 2.84 L·kg^-1 in the absence of DOM. At the same time, DOM could facilitate phenanthrene translocation from plant roots to the upper. As a result, the pH value of nutrient solution could increase by more than 1 unit when the co-existence of DOM and phenanthrene occurred in solution, suggesting that H^＋ -phenanthrene cotransport system is involved in the uptake of phenanthrene by plants. A synergism was also found between wheat uptakes of phenanthrene and inorganic nutrients, Moreover, DOM accelerated markedly the synergism. It is concluded that DOM affects the uptake of phenanthrene by plants and the environmental behaviors of phenanthrene.

关 键 词： 菲 水溶性有机物 植物 吸收 生物浓缩 多环芳烃

领　　域： [环境科学与工程]