绿色食品生产中土壤作物系统铅的积累与迁移研究

研究了Pb在土壤-作物生态系统中的积累和迁移，并结合水稻绿色食品生产，进行了无机肥、有机肥和生物菌肥及其配比试验．结果表明，土壤全Pb含量随土层的加深而逐渐递减，收获后土壤全Pb含量在0～15和15～30cm分别为11．14和9．37mg·kg^-1．水稻根从土壤中吸收Pb，并向茎、叶和籽粒中迁移．在同一生长期，水稻植株不同部位全Pb累积态势为：根>茎叶>籽粒．在不同生长期，随水稻生长发育，全Pb含量缓慢增加，至收获时，606—14和辽粳294籽粒中全Pb含量分别为0．008和0．007mg·kg^-1，均低于绿色食品标准．方差分析表明，品种间产量差异显著；不同处理间产量差异不显著．试验结果表明。可以用有机肥或生物菌肥来代替无机肥进行水稻生产．

Accumulation and translocation of lead in soil-crop system of green food production

In this paper, the accumulation and translocation of lead in soil-crop ecosystems were studied through fertilization with chemical fertilizer, manure and bio-fertilizer. The results showed that the soil total Pb content was decreased with soil depth. It was 11.14 and 9.37 mg x kg(-1) in 0-15 and 15-30 cm after harvest, respectively. Rice root absorbed lead from soil, and transferred it to stem-leaf and grain. The Pb content in rice plant was root>stem and leaf>grain, which was increased with rice growth. The grains of 606-14 and Liao 294 contained 0. 008 and 0.007 mg x kg(-1) of Pb, respectively, which is under the standard of green food. Variance analysis indicated that the grain yield of different varieties had a significant variance, but no significant variance was found among different treatments. It could be summarized that manure or bio-fertilizer could be the substitute of chemical fertilizer in producing rice.