《Table 4 Estimation of the ancient trees age using different methods》

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《Estimating the Age of Oil-tea Camellia Trees》

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The optimal equation for basal trunk disc Y=576.900 1exp（-4.153 0x-0.314 2）and for secondary trunk disc at different heights Y=71.296 1exp[-3.874 4exp（-0.006 4t）]was used to estimate the age of ancient oil-tea camellia trees（Table 4）.When secondary trunk discs at different heights were classified into two groups（4 and 6 cm），the estimated age of the standard tree was 149 and 155 years，respectively，with an average of 152 years and an error ranging from-15 to 18 years.The estimated age of#1，2，and 3 trees were 215，74，and 135 years if secondary trunk discs at 4-cm group were used to calculate，while the estimated age of#1，2，and 3 trees was 221，72，and 151 years if secondary trunk discs at 6 cm group were used.The average age of#1，2，and 3 trees was 218，73，and 143 years with an error ranging from-21 to 33 years，-3 to 2 years，-21 to 10 years，respectively.