不同有机物料对土壤硒形态及小麦硒吸收的影响

【目的】研究活化富硒土壤的有机硒,提高其有效性。【方法】采用田间小区试验,研究不同有机物料(生化腐殖酸,矿源腐殖酸和鸡粪有机肥)对土壤硒形态转化及小麦硒吸收的影响。【结果】施用生化腐殖酸与矿源腐殖酸均显著降低土壤pH值。随着施用时间的延长,鸡粪有机肥和矿源腐殖酸处理土壤中可溶态硒与可交换态硒含量较未添加处理均显著增加;施用生化腐殖酸处理较未添加处理可显著提高可交换态硒含量,而土壤可溶态硒含量无显著差异。施用鸡粪有机肥、矿源腐殖酸均显著提高小麦籽粒硒的富集系数,而生化腐殖酸主要提高小麦根富集系数。施用鸡粪有机肥和矿源腐殖酸小麦籽粒硒含量,较未添加处理分别提高34.48%、27.59%。【结论】施用鸡粪有机肥和矿源腐殖酸,可提高石灰性富硒土壤中可溶态硒与可交换态硒含量,提高小麦籽粒硒含量。

Effects of Different Organic Materials on the Forms of Selenium and the Absorption of Selenium in Wheat

【Objective】 To improve the effectiveness of organic selenium in selenium-enriched soil. 【Method】Field experiment was conducted to study the effects of different organic materials (biological humic acid, source humic acid and chicken manure) on the transformation of selenium in soil and the selenium absorption of wheat.【Result】The results showed that both biological humic acid and source humic significantly decreased soil pH. With the prolongation of application time, soluble selenium and exchangeable selenium in chicken manure and source humic acid-treated soil increased significantly compared with the control. The biochemical humic acid treatment significantly increased exchangeable selenium content, but there was no significant difference in soil soluble selenium content. Application of chicken manure and source humic acid significantly increased the selenium enrichment coefficient of wheat grain, while biochemical humic acid mainly increased the root enrichment coefficient. The selenium content of chicken manure and the source humic acid wheat grain was increased by 34.48% and 27.59% respectively compared with the control. 【Conclusion】Application of chicken manure and source humic acid could increase soluble selenium and exchangeable selenium content in calcareous and selenium-rich soils, thus increasing selenium content in wheat grains.