林业科学研究2026，Vol.39Issue(2)：80-92,13.DOI:10.12403/j.1001-1498.20250099
不同施硒水平对核桃坚果品质及抗氧化影响
Effect of Soil Application of Selenium-enriched Organic Fertilizer on Quality and Antioxidant of Walnut Nuts
摘要
Abstract
[Objective]To investigate the effects of soil application of selenium-enriched organic fertilizer on selenium accumulation and fatty acid in the kernel of'Lvling'walnuts,as well as to evaluate the in vitro antioxidant capacity of selenium-enriched walnut kernels,thereby providing a scientific basis for the cultiv-ation of selenium-enriched walnuts.[Methods]Based on the 20-year old'Lvling'walnut trees,selenium-enriched organic fertilizer was applied by strip trenching along the outer edge of the tree crown during the shell hardening period and the oil accumulation period respectively.Nuts were harvested at the ripening period,and kernel quality traits and in vitro antioxidant capacity were determined.Correlation analyses were conducted to examine the relationships between selenium content,kernel components,and antioxid-ant activity.[Results]The selenium content in walnut kernels showed a trend of first increasing and then decreasing with the increase of the amount of selenium-enriched organic fertilizer application.In both ap-plication periods,the highest kernel selenium content was observed at an application rate of 2 kg/plant,beyond which selenium content declined.Selenium uptake by the kernels was more efficient when fertil-izer was applied during the shell hardening stage than during the oil accumulation stage,with a maximum selenium content of 0.252 mg/kg in the former,compared with 0.103 mg/kg in the latter.Kernel antioxidant capacity increased to varying degrees with increasing selenium content.However,the enhancement of hy-droxyl radical scavenging capacity,O2-radical scavenging capacity,and ABTS cation radical scavenging capacity were not significant when the application rate was more than 2 kg/plant.The selenium content in kernels was significantly positively correlated with soluble sugars,starch,soluble proteins,linoleic acid,li-nolenic acid,hydroxyl radical scavenging ability,ABTS cation radical scavenging ability,and DPPH radical scavenging capacity ability,and was highly significantly negatively correlated with oleic acid.[Conclusion]Application of selenium-enriched organic fertilizer at 2 kg/plant during the hardening period resulted in a selenium content of 0.252 mg/kg in the kernels of'Lvling'.This treatment significantly increased the seleni-um content in the kernels,and represented the most economical fertilization strategy.Moreover,it in-creased the contents of soluble sugars,starch,and linoleic acid,leading to a notable improvement in ker-nel quality.关键词
核桃/富硒有机肥/果实品质/脂肪酸/抗氧化能力Key words
walnut/selenium-enriched organic fertilizer/fruit quality/fatty acids/antioxidant capacity分类
农业科技引用本文复制引用
丁新宇,李士魁,刘志鑫,贾鹏,陈利英,齐国辉..不同施硒水平对核桃坚果品质及抗氧化影响[J].林业科学研究,2026,39(2):80-92,13.基金项目
河北省现代农业产业技术体系干果产业创新团队核桃新品种选育与栽培岗(编号:HBCT2024190205) （编号:HBCT2024190205）
