通过对东北地区污染农田黑土剖面的取样调查分析,对重金属Cd、Pb、Cu、Zn在农田黑土中的污染状况及其迁移特征进行了对比研究,并就BCR(the Comm un ity Bureau of R eference)连续提取法在农田土壤重金属污染评估中的应用进行了探讨。...通过对东北地区污染农田黑土剖面的取样调查分析,对重金属Cd、Pb、Cu、Zn在农田黑土中的污染状况及其迁移特征进行了对比研究,并就BCR(the Comm un ity Bureau of R eference)连续提取法在农田土壤重金属污染评估中的应用进行了探讨。结果表明,重金属的迁移率大小依次为:Cd>Cu>Pb>Zn,Cd的酸可溶态占全量的比率高于其它重金属。Pb的酸可提取态浓度随土壤深度增加而增大,公路附近土壤中Pb、Cu及城市郊区土壤中Cd、Pb和Zn的氧化物结合态含量均随土壤深度的增加而升高,已存在向下迁移的趋势。4种重金属有机结合态在采样区土壤中基本都表现为耕层高于非耕层。研究表明,应用BCR连续提取法有助于确定土壤重金属污染以及重金属向下迁移状况,借助该法可以有效、可靠地对土壤重金属污染进行评估。展开更多
The mining ecotype Sedum alfredii Hance could tolerate and grow normally in a nutritive solution containing cadmium (Cd) as high as 400 mumol/L. Under such a high Cd concentration, the subcellular accumulation of Cd i...The mining ecotype Sedum alfredii Hance could tolerate and grow normally in a nutritive solution containing cadmium (Cd) as high as 400 mumol/L. Under such a high Cd concentration, the subcellular accumulation of Cd in root, stem and leaf of this plant was found to be the highest in the cell wall, less in the soluble fraction and lowest in the cell organs. The mode of subcellular distribution of Cd in the mining ecotype S. alfredii was similar to other hyper accumulators of heavy metals, in which Cd was distributed more in the aerial part of plant. The results suggest that the mining ecotype S. alfredii is a new species of Cd hyperaccumulator.展开更多
文摘通过对东北地区污染农田黑土剖面的取样调查分析,对重金属Cd、Pb、Cu、Zn在农田黑土中的污染状况及其迁移特征进行了对比研究,并就BCR(the Comm un ity Bureau of R eference)连续提取法在农田土壤重金属污染评估中的应用进行了探讨。结果表明,重金属的迁移率大小依次为:Cd>Cu>Pb>Zn,Cd的酸可溶态占全量的比率高于其它重金属。Pb的酸可提取态浓度随土壤深度增加而增大,公路附近土壤中Pb、Cu及城市郊区土壤中Cd、Pb和Zn的氧化物结合态含量均随土壤深度的增加而升高,已存在向下迁移的趋势。4种重金属有机结合态在采样区土壤中基本都表现为耕层高于非耕层。研究表明,应用BCR连续提取法有助于确定土壤重金属污染以及重金属向下迁移状况,借助该法可以有效、可靠地对土壤重金属污染进行评估。
文摘The mining ecotype Sedum alfredii Hance could tolerate and grow normally in a nutritive solution containing cadmium (Cd) as high as 400 mumol/L. Under such a high Cd concentration, the subcellular accumulation of Cd in root, stem and leaf of this plant was found to be the highest in the cell wall, less in the soluble fraction and lowest in the cell organs. The mode of subcellular distribution of Cd in the mining ecotype S. alfredii was similar to other hyper accumulators of heavy metals, in which Cd was distributed more in the aerial part of plant. The results suggest that the mining ecotype S. alfredii is a new species of Cd hyperaccumulator.
