Effects of Soil Types in Tea Garden on Distribution and Composition of Rare Earth Elements in Tieguanyin

Abstract:

In order to verify the quality safety of Tieguanyin tea, and trace the source of hidden danger, the distribution, composition, transfer and enrichment capacity of rare earth elements in leaves of Tieguanyin planted in 3 types of soil in Anxi County, Fujian Province were studied. The results showed that all of tea and soil types were dominant by La, Ce, Nd and Y, but the composition characters of rare earth elements in soils were different, and the contents of rare earth elements in tea were in the order of the third leaf > the second leaf > the first leaf > leaf stalk. The composition of rare earth elements were similar in leaves at different position planted in the same garden, which were different from leaf stalk. There was significant influence of soil type on accumulation of rare earth elements in tea. The contents of rare earth elements in tea from yellow-red soil were significantly lower than those from red soil and yellow soil (P<0.05). The correlation coefficient of composition of rare earth elements between tea and soil were 0.886-0.985 (P<0.001), which indicated the composition of rare earth elements in tea was significantly positively correlated with soil types. Therefore, the accumulation and distribution of rare earth elements in Tieguanyin tea had significant relation with soil type of tea garden.

Key words:Tieguanyin tea;Soil;Rare earth element;Accumulation