【摘要】 采用盆栽试验方法,研究了3种不同类型的人为污染土,即草甸棕壤(辽宁)、红壤(湖北)、灰色石灰土(广西)中不同Pb的含量(添加量为0,125,250,500,1000,2000mgPb·kg-1,Pb(OAc)2·3H2O)对水稻生长和吸收Pb的影响。结果表明,除了湖北红壤中2000mgPb·kg-1处理使稻草干物重与对照相比减产约20%外,其余处理对稻草和稻谷产量均无明显影响。水稻吸收的Pb与土壤中的添加Pb、总量Pb(实测值)和DTPA可提取Pb含量之间均有着极显著的相关性,并由此计算了Pb的表观临界含量,其中湖北土对Pb的污染十分敏感(表观临界含量为79mgPb·kg-1)。更多还原

【Abstract】 Soil lead potentially threatened to human health, so understanding dose- response relationship of soil lead concentration with wetland rice (Oryza sativa L.) uptake of lead was very crucial to prevent lead pollution in food chain. The effects of different lead concentration in meadow brown earth (Liaoning), red earth (Hubei) and gray limestone soil (Guangxi) on wetland rice growth and its uptake of lead were investigated. The results showed that all treatments did not significantly change the biomass of wetland rice except the treatment of 2 000 mg· kg- 1 lead in red earth, with 20% biomass reduction. Very significant correlations between brown rice lead concentration with the spiked soil lead concentration, total soil lead concentration and DTPA extracted soil lead concentration were established. Apparent critical soil lead concentration was 79 mg· kg- 1 in red earth, which suggested that red earth was very sensitive to lead pollution.更多还原