不同腐殖酸物质对土壤中汞的固定作用及植物吸收的影响

通过盆栽试验研究了不同腐殖酸物质对土壤有机结合态汞、全汞含量及土壤汞生物有效性的影响.结果表明,不同供试腐殖酸物质可以显著增加土壤中有机结合态汞和残留在土壤中汞的含量,降低土壤中汞的挥发量,从而有效降低土壤汞的生物有效性.与加入HgCl2但不施加腐殖酸物质的对照CK2相比,添加腐殖酸钠、提纯后的煤基腐殖酸、土壤腐殖酸、氨化风化煤、风化煤、褐煤、泥炭的处理中油菜对土壤中汞的吸收量分别降低了73.62%、71.11%、63.39%、40.05%、33.61%、22.26%、5.66%.

Effects of different humic acid materials on mercury fixation in soil and mercury absorption by plant

A pot experiment was conducted to study the effects of different humic acid materials on organic combined mercury and total mercury contents in soil and the biological availability of soil mercury. The results indicated that different humic acid materials significantly increased organic combined mercury and remained mercury in soil, reduced the volatility quantity of soil mercury, and therefore decreased the biological availability of soil mercury. Comparing to CK_ 2 , which was only added with HgCl_ 2 , the absorption quantities of rape to mercury in treatments added with humic acid sodium, purified weathering coal humic acid, soil humic acid, ammonified weathering coal, weathering coal, lignite coal and peat decreased 73.62%, 71.11%, 63.39%, 40.05%, 33.61%, 22.26%, and 5.66% respectively.