• 关键词：土壤  镍  形态  生物可利用性  63Ni示踪法

• 基金项目：

• 涂从
• 中国科学院南京土壤研究所土壤圈物质循环开放研究实验室, 南京 210008

• 摘要：采用63Ni示踪法和连续提取技术，并综合运用偏剔除法、人工模拟法、幼苗试验法和盆栽试验法及统计分析法研究了各形态土壤镍的植物可利用性。结果表明，土壤中水溶交换态Ni是植物可利用性Ni的主要形态，碳酸盐态和有机态Ni有一定贡献，铁锰氧化物结合态和残留态Ni对植物几乎无效（指氧化环境而言）.

• Abstract：The bioavailability of various Ni fractions in soils was investigated employing 63 Ni tracer technique and sequential extraction procedure as well as synthetic investigation methods including partial dissolution procedure, simulated Ni forms, seedling culture, pot experiment and statistical analysis. The results showed that soluble plus exchangeable Ni was the major fraction of soil Ni available to plant. Nickel bound to carbonate and organic matter might also play some role in Ni uptake by plant. However, Fe/Mn oxide bound and residual Ni were nearly unavailable to plant(in oxidizing environment).

• Key words：soil  nickel  fraction  bioavailability  63 Ni tracer.

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