不同修剪高度对茶树稀土和氟铝含量及品质的研究

Analysis of rare-earth element, F and Al and biochemical components content in tea plant with different cutting heights

中文关键词:  茶树  稀土  氟  铝  修剪高度

英文关键词:tea plant  rare-earth element  F  Al  cutting height

中文摘要:

      目的 分析不同茶树修剪高度稀土(REE)、氟(F)、铝(Al)含量的高低, 为阐明茶树高度和稀土F、Al含量在茶树中的积累特性机制提供一定的基础。方法 采用ICP-MS测定茶叶中稀土和Al含量, 氟离子电极法测定茶叶中F含量, 应用Microsoft Excel软件和SPSS19.0软件, 采用使用新复极差法进行显著性分析, Pearson相关性分析茶树稀土的含量和生化成分差异及其相关性。结果 经过定型修剪后, 表现为随着茶树修剪高度的降低, 稀土和Al含量呈逐渐增加的趋势, 修剪高度最低的20 cm稀土含量(0.36 mg/kg)显著高于传统树冠高度60 cm(0.12 mg/kg)，F含量则在40 cm修剪高度时达到最高; 儿茶素总量和茶多酚含量则有随着茶树高度的增加而降低, 成品茶中稀土、F、Al含量大致和定型修剪后的鲜叶一致。 稀土含量和F、Al含量之间达到了极显著相关, 稀土、Al含量与茶叶品质成分中的酯型儿茶素也呈显著的正相关。结论 本研究发现不同修剪高度对茶树的稀土、F、Al元素含量和品质成分均产生了一定的影响, 但影响程度不同, 随着修剪高度的降低, 茶树传统树冠下稀土、F、Al元素的含量均会低于现阶段采用的矮树冠。

英文摘要:

      Objective To analyze the content of rare earth element (REE), F and Al elements between different tea tree pruning height, in order to clarify the relation between tea plant height and rare-earth, F, and Al content, and provide basis for explaining the accumulation characteristics in tea plant. Methods The REE and Al content in tea were determined by ICP-MS, and the F content in tea plant was determined by F ion electrode method. The data was analyzed with Microsoft Excel software and SPSS19.0, while the relationship between the REE, F and Al content and the routine biochemical components content was analyzed by Pearson correlation analysis and their significance with the new multiple range method. Results After mowing, with the tea plant height increasing, the REE and Al content were gradually decreased, and the mowing height 20 cm (0.36 mg/kg) had the max REE content which was significantly higher than traditional canopy height 60 cm (0.12 mg/kg), the tea plant had the max F content at cutting height of 40 cm; while total catechins and polyphenols content were reduced with the height increasing. The REE, F and Al content were significantly correlated, and the content of REE and Al also showed a significant positive correlation with tea catechins. Conclusions The study finds that different cutting heights of tea have a significant impact on the content of REE, F, and Al element and the quality ingredients in tea, but they have different degrees impacts, while with the mowing height reduce, the content of REE, F, and Al of traditional height on tea plant is significantly lower than the height at present.