Key Laboratory of Vegetation Ecology, Institute of Grassland Science, Northeast Normal University, Changchun 130024, China.
J Hazard Mater. 2010 Feb 15;174(1-3):202-8. doi: 10.1016/j.jhazmat.2009.09.137. Epub 2009 Oct 2.
To know about the effect of major nutrient elements on various forms of Pb and metal extraction, a greenhouse experiment was conducted to assess the effects of various major nutrient elements on Pb accumulation in two crops (Spinacia oleracea, SO and Sonchus arvensis, SA) in Changchun, China. Results indicated that, for SO, the Pb concentrations in both shoots and roots had no difference with increasing nutrients except for low nutrient treatment (1/2H). For SA, high nutrient treatments (2H and 3H) resulted in higher Pb concentrations in roots than low and standard nutrient treatments (1/2H and C), but high Pb concentration in shoot appeared in low and highest nutrient treatments (1/2H and 3H). The nitrogenous nutrient treatment (2N) had the most effect of increasing Pb concentrations in roots of SO and SA. The potassic and phosphorus nutrient treatments (2K and 2P) had little effect on the Pb concentrations in plant tissues for SO. Pb concentration in SO was lower than SA. Because of the higher total biomass in SO than SA, the ability to Pb accumulation in SO was better than SA. Sequential extraction results indicated that the addition of soil amendments transform soil Pb from bioavailable fractions to non-bioavailable fraction substantially. The results suggest that nitrogen fertilizer for SO and phosphorus fertilizer for SA are the most effective materials for the remediation of Pb-contaminated soils, and increase the tolerance of crops to Pb contamination.
为了了解主要营养元素对各种形态 Pb 和金属提取的影响，在中国长春进行了一项温室实验，以评估各种主要营养元素对两种作物（菠菜和苦荬菜）中 Pb 积累的影响。结果表明，对于菠菜，除低营养处理（1/2H）外，随着养分的增加，茎叶中的 Pb 浓度没有差异。对于苦荬菜，高营养处理（2H 和 3H）导致根部的 Pb 浓度高于低营养和标准营养处理（1/2H 和 C），但高营养和最高营养处理（1/2H 和 3H）中出现了高 Pb 浓度的茎叶。氮营养处理（2N）对菠菜和苦荬菜根部 Pb 浓度的增加影响最大。钾和磷营养处理（2K 和 2P）对菠菜组织中 Pb 浓度的影响较小。菠菜中的 Pb 浓度低于苦荬菜。由于菠菜的总生物量高于苦荬菜，因此菠菜积累 Pb 的能力优于苦荬菜。连续提取结果表明，土壤改良剂的添加可将土壤 Pb 从生物可利用部分转化为非生物可利用部分。结果表明，对于 Pb 污染土壤的修复，氮肥对菠菜和磷肥对苦荬菜是最有效的材料，并提高了作物对 Pb 污染的耐受性。
