Analysis Of Trace Elements And Influence Factors In Hilly Tea Plantation Soils And Tea

In addition to tea polyphenols, caffeine, vitamins and other organic ingredients beneficial to human body, tea leaves also contain many varieties of trace elements. Many trace elements are beneficial to human body, but some are detrimental. Comparing to mountain tea plantations, hilly tea plantations are affected more by human influence and interference. The concentrations of trace elements in soil and tea leaves of hilly tea plantations are being studied more extensively.Using field survey sampling, laboratory analysis and other research methods, this study performed correlation analysis of several types of parent soil, different ecological measures, the concentrations of trace elements in soils and tea leaves of different tea breeds. The results are as follows:1. The soil of the studied regions contains Zn32.735mg/kg-73.845mg/kg, Pb17.035mg/kg-52.04mg/kg and Cu0.4335mg/kg-1.507mg/kg at a concentration lower than the standard set in Pollution-free Tea Producing Environmental Conditions (NY5020-2001) and National Soil Environmental Quality Standard (GB15618-1995). The concentrations of Znl9.165mg/kg-56.83mg/kg, Pb0.965mg/kg-3.26mg/kg and Cu4.895mg/kg-17.46mg/kg in fresh tea leaves fall into the controlled range set by (GB2762-2012) National Standard.2. The soil with granite parents contains higher concentration of Zn, Pb and Cu than the clay parent soil of the Quaternary. The concentrations of Zn, Pb and Cu in soil of vegetable gardens strongly influenced by human activities and rice field-turned vegetable gardens are higher than that in soil of The Quaternary clay tea garden.3. In the controlled tests of formula fertilization of tested soil base, the concentrations of Zn and Cu in soil and tea leaves showed minimum changes. Long-term straw hay covering increased the valid state Pb in soil and tea leaves. Intercropping maples lowered the concentration of Pb.4. The capacity of tea leaves to absorb trace elements is proportional to the age of the tea plantation. Taoyuan Big Leave Teas and the New Breed of Feiyue Base showed less capacity to enrich Pb. 5. The concentrations of valid state Zn, Pb, Cu are no correlation to those in tea leaves. The concentrations of Zn, Pb, Cu in tea leaves changes along with the concentration of valid Zn, Pb, Cu in the soil. All tea leaves actively absorb trace elements according to their own law of requirements.