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Effects of soil properties on the transfer of cadmium from soil to wheat in the Yangtze River Delta Region, China - A typical industry-agriculture transition area

机译:长江三角洲地区典型农工过渡区土壤性质对镉从土壤向小麦的迁移的影响

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In order to identify the effects of soil properties on the transfer of Cd from soil to wheat under actual field conditions, 126 pairs of topsoil and wheat samples were collected from the Yangtze River delta region, China. Relevant parameters (Cd, Ca, Mg, Fe, Mn, Zn, N, P, K, S, pH, total organic carbon, and speciation of soil Cd) in soil and wheat tissues were analyzed, and the results were treated by statistical methods. Soil samples (19.8%) and 14.3% of the wheat grain samples exceeded the relevant maximum permissible Cd concentrations in China for agricultural soil and wheat grain, respectively. The major speciations of Cd in soil were exchangeable, bound to carbonates and fulvic and humic acid fraction, and they were readily affected by soil pH, total Ca, Mg, S and P, DTPA-Fe, Ex-Ca, and Ex-Mg. Cadmium showed a strong correlation with Fe, S, and P present in the grain and the soil, whereas there was no significant correlation in the straw or root. Generally, soil pH, Ca, Mg, Mn, P, and slowly available K restricted Cd transfer from soil to wheat, whereas soil S, N, Zn, DTPA-Fe, and total organic carbon enhance Cd uptake by wheat.
机译:为了确定土壤特性对实际田间条件下Cd从土壤向小麦的迁移的影响,从中国长江三角洲地区采集了126对表土和小麦样品。分析了土壤和小麦组织中的相关参数(镉,钙,镁,铁,锰,锌,氮,磷,钾,硫,pH,总有机碳和土壤镉的形态),并对结果进行统计学处理方法。土壤样品(19.8%)和14.3%的小麦颗粒样品分别超过了中国农业土壤和小麦颗粒的最大允许Cd浓度。土壤中Cd的主要形态是可交换的,与碳酸盐以及黄腐和腐殖酸部分结合,并且容易受到土壤pH,总Ca,Mg,S和P,DTPA-Fe,Ex-Ca和Ex-Mg的影响。 。镉与谷物和土壤中的Fe,S和P密切相关,而秸秆或根部则无明显相关性。通常,土壤的pH,Ca,Mg,Mn,P和缓慢可用的K限制了Cd从土壤向小麦的转移,而土壤S,N,Zn,DTPA-Fe和总有机碳则增加了小麦对Cd的吸收。

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