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为探讨茶树品种对茶园土壤可溶性有机氮(SON)组成的影响,以福建省中亚热带相同成土母质、地形和土壤类型的两种相邻的不同品种(黄金桂和福云6号)茶园为研究对象,采用TOC-TN分析、离子自动分析、氨基酸自动分析、气相色谱分析和核磁共振分析等技术,分析了不同茶树品种茶园表层(0~15 cm)土壤SON含量和组成特点及其差异。结果表明:黄金桂和福云6号表层土壤氨基酸含量分别占SON总量的37.24%和30.71%,供试茶园土壤SON组成均以非氨基酸的SON占优势,但黄金桂表层土壤氨基酸含量极显著高于福云6号;两种茶园表层土壤氨基酸均以中性氨基酸占优势,但黄金桂表层土壤中性氨基酸和含硫氨基酸含量分别显著和极显著高于福云6号;两种茶园表层土壤氨基酸种类组成相同,但黄金桂表层土壤的脯氨酸、苯丙氨酸、组氨酸、异亮氨酸、亮氨酸、丙氨酸、甘氨酸和缬氨酸含量比福云6号高52.93%~100.00%。研究表明茶树品种对茶园土壤SON组成具有显著影响,应关注茶树品种对占优势的非氨基酸SON组成的影响及其在茶园生态系统中的环境效应研究。
In order to explore the effect of tea tree species on soil soluble organic nitrogen (SON) composition in tea plantation, the tea plantations of two adjacent varieties (Huangjinui and Fuyun 6) of the same parent material, topography and soil type in the middle subtropical area of Fujian Province were In this study, TOC-TN, automatic ion analysis, automatic amino acid analysis, gas chromatographic analysis and nuclear magnetic resonance (NMR) analysis were used to analyze the characteristics and differences of SON content and composition of the surface tea (0-15 cm) The results showed that the contents of amino acids in topsoil of Huangjinui and Fuyun 6 accounted for 37.24% and 30.71% of the total amount of SON, respectively. The contents of SON in the tea plantation soils were all dominated by non-amino acid SON, but the content of amino acids in topsoil Which was higher than that of Fuyun No.6. The amino acids in the surface soils of the two kinds of tea plantations were all dominated by neutral amino acids, but the contents of neutral amino acids and sulfur amino acids in the surface soils were significantly and extremely significantly higher than those of Fuyun No.6. The contents of proline, phenylalanine, histidine, isoleucine, leucine, alanine, glycine and valine in topsoil were 52.93% -100.00 higher than that of Fuyun 6 %. Studies have shown that tea tree varieties have significant influence on the composition of SON in tea plantation so we should pay attention to the influence of tea varieties on dominant non-amino acid SON composition and its environmental effects in tea plantation ecosystem.