西藏高原土壤因子对青稞功能性成分的影响

Effects of Soil Factors on the Contents of Special Nutrients in Hulless Barley Planted in Tibet Plateau

为探明高原土壤因子对青稞功能性营养成分的影响,对西藏18个县青稞的β-葡聚糖含量与黄酮含量进行分析。结果表明,土壤水解性氮含量与p H值是影响β-葡聚糖含量和黄酮含量的主要因子,其中β-葡聚糖含量与碱解氮含量呈极显著负相关,与p H值呈极显著正相关,与土壤全磷、铁含量呈显著正相关;黄酮含量与土壤水解性氮含量、有机质含量均呈显著正相关。在酸性、强碱性土壤逆境环境下,青稞黄酮含量较高。

This study was undertaken to clarify the relationship between the contents of special nutrients in highland barley and soil factors in Tibet Plateau. A total of 181 samples of highland barley were collected from 18 counties belonging to six prefecture-level cities in Tibet; at the same time, soil samples were collected at each site where highland barley samples were taken. Plant samples were assessed for their contents of β-glucan and flavonoids, while soil samples were examined for their mineral and organic matter contents as well as p H value. The results showed that the main factors affecting the contents of flavonoids and β-glucan in highland barley were soil hydrolyzable nitrogen content and p H value. Specifically, β-glucan content had a significant negative correlation with available nitrogen content in soil; but had very significant positive correlations with soil p H value, total phosphorus content, and iron content. The content of flavonoids in highland barley was positively correlated with the contents of soil hydrolyzable nitrogen and organic matter, and highland barley grown in either acidic soil or strongly alkaline soil had a higher content of flavonoids.