The excessive existence of heavy metals in soil not only destroys the physical and chemical properties of soil and affects the normal growth of plants,but also affects the health and safety of human body through food chain transmission.By adding exogenous cadmium(10 mg/kg,30 mg/kg,50 mg/kg)to potted soil,different pollution levels under natural conditions were simulated in this paper,and the pollution characteristics of heavy metal cadmium in two endemic tree species of alpine pine and alpine oak were analyzed by using enrichment coefficient and transport coefficient,so as to explore the transfer and enrichment law of heavy metals in soil-plant system,and provide some basis for bioremediation of polluted soil.The results showed that:(1)After 90 days,the cadmium content in Pinus densata Mast.and Quercus semicarpifolia Smith was positively correlated with the cadmium content in the soil,and mainly accumulated in the underground.(2)With the increase of soil cadmium concentration,the enrichment coefficient of aboveground and underground parts of Pinus densata Mast.increased first and then decreased,and reached the maximum when the cadmium concentration was 30 mg/kg.The transport coefficient increased with the increase of soil cadmium concentration.(3)The enrichment coefficient of aerial and underground parts of Quercus semicarpifolia Smith was negatively correlated with soil cadmium concentration,and reached the maximum when the cadmium concentration was 10 mg/kg.The transport coefficient decreases with the increase of cadmium concentration in soil.
关键词
重金属/高山松/高山栎/富集系数/转运系数
Key words
heavy metals/Pinus densata Mast./Quercus semicarpifolia Smith/enrichment coefficient/transport coefficient
维普
万方数据