不同硒源对堇叶碎米荠吸收、转化硒的效应研究

Study of selenium application on absorption and transformation of selenium in Cardamine violifolia

采用Na2SeO3和硒矿粉进行盆栽试验,研究不同硒源处理对堇叶碎米荠吸收、转化硒的影响。研究结果表明,施用硒对堇叶碎米荠硒含量和硒积累量的增加效果显著,植株各部位硒积累规律为叶>茎>根。比较两种含硒物料,发现在硒用量低时,施用硒矿粉对堇叶碎米荠各部位硒含量的增加效果较施用Na2SeO3好,而在硒用量高时,则效果相反。施用硒矿粉较Na2SeO3处理有提高堇叶碎米荠叶片硒转化率的趋势。适量施用硒能增加植株对硒的利用率。施用Na2SeO3主要提高了土壤可交换态硒含量;施用硒矿粉主要提高了土壤残渣态硒含量。

A pot experiment was carried out to study the effects of applying Na2 SeO3 and selenium ore powders on the absorption and transformation of selenium in Cardamine violifolia. The results showed that the selenium content and accumulation were significantly increased after applied selenium, and the selenium accumulation of different parts was leaf 〉 stem 〉 root. Compared with two kinds of selenium, the effects of increasing selenium application rate was better with applying sele- nium ore powders than Na2 SeO3 when the dosage of selenium was low, and it was opposited when the dosage of selenium ap- plication rate was high. The trend of inorganic selenium into organic selenium ratio of leaf was improved with the applying of selenium ore powders than Na2 SeO3. The selenium availability was raised by the proper application of selenium. The ligand- exchangeable and residual selenium of soil was mainly increased by using of Na2SeO3 and selenium ore powders, respectively.