부산대학교 도서관

To analyze the effects of soil acidity on tea quality and the ability of soil nitrogen transformation, the tea leaves and tea tree rhizosphere soils were collected from 26-tea plantations and determined their contents of theanine and amino acids in tea leaves, the number of soil nitrogen transforming microorganisms and soil biochemical intensity. The results showed that the content of theanine and amino acid in tea leaves, the number of aerobic nitrogen-fixing bacteria and ammonifying bacteria in the soil and the nitrogen fixation intensity and ammonification intensity of the soil increased with the increase of pH value of tea tree rhizosphere soil. However, the number of soil nitrifying bacteria and denitrifying bacteria and soil nitrification intensity and denitrification intensity showed a downward trend. The results of principal component analysis showed that the contribution rate of principal component 1 and principal component 2 was 84.97 % and 7.57 %, respectively. In the soil with different acidity, the main contribution to differentiate the amino acid and theanine content in tea leaves came from the ability of soil for nitrogen fixation and ammonification as well as the ability of soil nitrification and denitrification. The results of correlation analysis showed that soil pH value was significantly positively correlated with theanine, amino acid, aerobic nitrogen-fixing bacteria, ammonifying bacteria, nitrogen fixation intensity and ammoniating intensity, while significantly negatively correlated with nitrifying bacteria, denitrifying bacteria, nitrification intensity and denitrification intensity. The intensification of soil acidity decreased the nitrogen fixation and ammonification activities and boosted nitrification and denitrification activities and decreased the quality of tea leaves. [ABSTRACT FROM AUTHOR]