淹水土壤有效态硒提取剂的比较研究

Comparative Studies of Available Se Extracts in Flooding Soil

采集几种肥力水平与含硒量差异较大的土壤连续两季 (次 )盆栽水稻 ,以植株含硒量 (μg/kg)和吸硒量(μg/盆 )作参比标准 ,对 6种提取剂所提取的有效态硒作相关分析 .结果表明 ,提取剂与水稻植株提取量的相关系数均达到显著或极显著水平的提取剂有水和 0 .0 3mol/L NH4F- 0 .0 2 5 m ol/L HCl;均未达到显著水平的提取剂为0 .2 m ol/L K2 SO4,除第一季 (次 )水稻植株的吸硒量外 ,0 .5 m ol/L Na HCO3和 AB- DTPA与两季 (次 )水稻的含硒量和第一季 (次 )水稻的吸硒量的相关系数均达到了极显著水平 .由此初步认为 ,除 0 .2 mol/L K2 SO4外 ,其他 5种提取剂均可作为淹水土壤有效硒的提取剂 .

A variety of pot rice was cultured in the soil with significantly different infertility levels and Se contents in 2 successive planting seasons to conduct a correlation analysis on Se contents obtained by using 6 extracts when Se contents in plant and Se contents absorbed (μg/kg) by plant were used as reference standands. The results showed that water and 0.03 mol/L NH 4F 0.025 mol/L HCl were the extracts whose correlation coefficients with Se absorbed by plant reached significant level,while correlation coefficients between 0.2 mol/L K 2SO 4 and Se absorbed by plant didn't reach significant level. ExceptabsorptioncontentsofSeinthefirstseasonrice,thecorrelationcoefficientsbetween 0 5 mol/L NaHCO 3 ,AB DTPA and Se contents in the first season rice,Se contents in the second season rice,Se absorption contents in the second season rice reached high significant level. It's concluded that except 0.2 mol/L K 2SO 4,the other 5 extracts can be used to extract available Se in flooding soil.