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以天津盐碱荒地农垦过程为例 ,分析盐碱荒地农垦为水田种植水稻后土壤环境中微量元素的变化特征。结果表明 ,随着垦殖年限的增加 ,Cd、As、Hg元素大量富集在 0～ 2 0cm土壤中 ,其原因与污水泡田相关 ;Cu、、Zn、Mn、Ba等植物生长必需的元素在 2 0～ 4 0cm的土壤中的含量高于 0～ 2 0cm土壤中的含量 ,与 0～ 10cm土壤中这些元素有一部分已经被植物吸收有关 ,B的含量在 0～ 2 0cm中较高 ,与人工施肥有关。污水灌溉仍是农业生产中土壤微量元素变化的主要影响因素。
Taking the process of reclamation of saline-alkali-wasteland in Tianjin as an example, the characteristics of trace elements in the soil environment after paddy cultivation in saline-alkali-wasteland was studied were studied. The results showed that Cd, As and Hg were enriched in 0 ~ 20 cm soil with the increase of reclamation years, and the reason was associated with sewage soils. Cu, Zn, Mn, Ba, The content of 20 ~ 40 cm in soil was higher than that in 0 ~ 20 cm soil, and some of these elements were related to plant absorption in 0 ~ 10 cm soil. The content of B was higher in 0 ~ 20 cm, Artificial fertilization. Sewage irrigation is still the main influencing factor of soil trace element changes in agricultural production.