《Table 1 Height, DBH and biomass composition and their differences of A.cremastogyne young average t

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《Biomass and Nutrient Accumulation Characteristics of Young Stands of Alnus cremastogyne》

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*indicates significant difference at 5%level；and**indicates very significant difference at 1%level.

Tree height，DBH and tree age For young stands of A.cremastogyne at the age of 1-4 years，tree height and DBH increased year by year（Table 1）.The trees at the age of 2 years showed a tree height increased by 77.78%compared with those at the age of1 year；the trees at the age of 3 years had a tree height increased by59.38%compared with those at the age of 2 years；and the trees at the age of 4 years exhibited a tree height increased by 21.57%compared with those at the age of 3 years.As to DBH，the trees at the age of 2 years exhibited a DBH increased by 136.36%compared with those at the age of 1 year；the trees at the age of 3 years had a DBH increased by 80.77%compared with those at the age of2 years；and the trees at the age of 4 years exhibited a DBH increased by 36.17%compared with those at the age of 3 years.The growth rates of the two parameters decreased year by year.Variance analysis showed that there were very significant differences in tree height and DBH between trees at the various ages.