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以华北地区典型土壤潮土为供试土壤,将猪粪(施用量占风干土重的0%,1%和3%)和不同Cu浓度(0,100,200,400,600和800 mg kg-1土)的CuSO4溶液腐化后与土壤混合均匀进行盆栽试验,以研究施用富Cu猪粪对土壤和小麦各器官(根、茎叶和籽实)Cu积累及对潮土—小麦系统Cu迁移转化的影响。结果表明,土壤全Cu、有效态Cu和小麦植株各器官Cu浓度均随着外源Cu浓度的增加而显著增加,在相同外源Cu浓度条件下,成熟期各指标浓度相对拔节期有所下降。外源Cu只有极少量从土壤向小麦转移,且在小麦各器官Cu浓度顺序为根>>茎叶/籽实。相对于拔节期,小麦成熟期根部Cu积累量显著上升,茎叶Cu积累量无显著变化,但根部和茎叶Cu浓度均显著下降。施用1%猪粪明显降低了Cu的可移动性,而3%猪粪在一定程度上增加了Cu的传递与积累。当外源Cu浓度≥200 mg kg-1时,0%和3%猪粪施用的处理籽实中Cu浓度超过了人体能接受的Cu毒性极限(20 mg kg-1),施用1%猪粪则潜在的降低了Cu在籽实中的积累。
Taking typical soil tide soil in North China as tested soil, CuSO4 solution with different concentrations of Cu (0, 100, 200, 400, 600 and 800 mg kg-1 soil) was used to spoil pig manure (0%, 1% and 3% The pot experiment was carried out after being mixed with soil to study the effect of Cu-rich pig manure application on Cu accumulation in soil and wheat organs (roots, stems, leaves and seeds) and on the migration and transformation of Cu in Chao-soil-wheat system. The results showed that Cu concentrations in all soil Cu, available Cu and wheat organs increased significantly with the increase of exogenous Cu concentration. Under the same exogenous Cu concentration, the concentration of each index in mature soil decreased at jointing stage . Only a very small amount of exogenous Cu was transferred from soil to wheat, and the order of Cu concentration in different wheat organs was root >> shoot / seed. Compared with the jointing stage, the accumulation of Cu in the roots of wheat at maturity stage increased significantly, while the accumulation of Cu in stems and leaves did not change significantly, but the Cu concentrations in roots and stems and leaves decreased significantly. The application of 1% pig manure significantly reduced the mobility of Cu, while 3% pig manure increased the transfer and accumulation of Cu to a certain extent. When exogenous Cu concentration was> 200 mg kg-1, the concentration of Cu in the treated seeds applied 0% and 3% pig manure exceeded the human body’s acceptable Cu toxicity limit (20 mg kg-1), and 1% pig manure Potentially reducing the accumulation of Cu in the seed.