摘要
在广东茂名地区油页岩矿渣土的小区试验表明 :香根草、杂交狼尾草、百喜草、钝叶草中铅、镉的浓度与分布均不相同 ,一般为根系浓度大于茎叶。施肥能使植物体内重金属元素浓度下降 ,但由于生物量增加 ,单位面积吸收量反而可能增大。因此 ,在选择净化土壤重金属的植物时 ,不仅要考虑吸收能力强弱 ,而且更要考虑生物量大小。
A plot experiment on the soil derived from oil shale residue in Maoming, Guangdong showed that four herbaceous plants, Vetiveria zizanioides, Pennisetum americarum×P. Purpureum, Paspalum notatum, and Stenotaphrum secundatum, varied in Pb and Cd uptake and distribution. Generally, their concentrations were higher in the ground part than in the aerial. Fertilization reduced the concentrations of the two heavy metals in the plants. On the other hand, increased biomass may raise the uptake rate per unit area. Therefore, when plants are selected for purifying heavy metals in soils, it is advisable to take into account not only their heavy metal uptake ability, but also, or even more, their biomass.
出处
《农村生态环境》
CSSCI
CSCD
2000年第4期28-32,共5页
Rural Eco-Environment
基金
国家自然科学基金!(39870 15 5 )
广东省自然科学基金!(980 147)
茂名石油化工公司资助
关键词
油页岩
矿渣土
草本植物
铅
镉
重金属吸收
heavy metal, herbaceous plant, oil shale residue, Pb, Cd, uptD
