腐殖质、硫、氯化钠对水稻积累汞的影响试验研究

THE EFFECT OF THE HUMUS, SULFUR,CHLORATOSODIUM ON ABSORPTION ANDACCUMULATIQN OF RICE

汞是环境中主要重金属污染物之一。国内外在研究汞在水生环境的迁移转化规律及其基质方面进行了大量的工作,但汞在陆生环境中的迁移转化,尤其是土壤—植物系统中影响汞吸收的机制方面研究得较少。近年来,国外对影响土壤吸收汞的机制的研究工作,认为土壤酸碱度、氧化还原电位是影响土壤、生物吸收重金属的主要因素。

The result of the present experiment showed that the application of organic fertilizer to the soil increased tfe content of organic matter in it and the more content of organic matter in the soil was, the more mercury content wonld be accumulated. However the mercury content transported to the rice was less. Therefore the proper application of organic fertilizer could decrease the damage of mercury on crops.As the result of applying too much chloratesodium to the soil, the growth of the rice was inhibited and the yield decreased, when the soil was treated with different dose of chloratesodium (500, 1000 ,5000ppm) the mercury absorption in soil was increased with the increasing chloratesodium content, but the amount of absorption did not increased in proportion to that of the chloratesodium added in the soil.when a certain amount of sulfur was added to the soil, the sulfur and the mercury turned into a steady compound. It fixed the mercury there and thus increased the mercury content in the soil. The sulfuric mercury fixed in the soil could not be absorbed easily by plants, so the mercury content transported to plants was reduced and this prevented vaperization of mercury to the arounding environment and get rid of the damage and contamination of mercury in the air and soil on plants.