遮荫对蒸青绿茶香气成分的影响

气相色谱分析遮荫茶与露天茶的香气组成,结果表明:露天茶不含β-檀香醇和苯甲酸及其所生成的酯,除低级脂肪族化合物含量较高外,其他香气成分遮荫茶比露天茶明显提高。其中芳樟醇、橙花醇、香草醇。香叶醇及其环化生成的萜品烯和醇等单萜烯类提高1.39～1.53倍,茉莉酮及其甲酯提高1.70～1.85倍,百里香酚提高3.64～11.26倍。两种覆盖处理相比,简易草覆虽含有较高的芳香族化合物和茉莉酮、芳樟醇、百里香酚等芳香成分,但大棚草覆茶的萜烯总量、紫萝酮系化合物、香豆素、十八烷醇以及高级脂肪酸的酯含量较高。这些增香剂以及定香剂使后者的香气较为持久。

Effects of Intercropping and Shading Systems on Tea Photosynthesis and Respiration

[Objective] The aim was to provide references for constructing compound ecological tea gardens. [Method] In an ecological adult-tea garden, teas shaded by Prunus cerasoides, Prunus L., and Litsea pungens were selected and the teas without shades were taken as a control in order to explore effects of tree shading on photosynthesis, respiration and net photosynthetic intensities. [Result] In a growth cycle of one year, for teas shaded by Prunus cerasoides, Prunus L., and Litsea pungens, respiration intensity was significantly higher than that of the control; net photosynthetic intensity was extremely significant higher; photosynthesis intensity showed none rules. Both of net photosynthetic rate and intensity kept higher in winter of shaded teas. [Conclusion] It is of significance for high-yielding and high-quality teas to reduce respiration consumption and coordinate between photosynthesis and respiration given that tea grows well.