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the fastest growing tree species in China
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Paulownia
grows fast biologically, so that its stem will be big enough for some purpose when it is 7-8 years old if the appropriate management is given. Based on the investigation on growth of P.fortunei and P. elongata, their mean annual increment of diameter at breast height (DBH) reached 3-4 cm with its maximum value of 7-8 cm, their mean annual increment of volume reached 0.03-0.05 m3 per plant with its maximum value of 0.2 m3 per plant. For example, a P.fortunei tree growing in Guilin city, Guangxi Autonomous Region had its DBH of 77 cm, height of 21 m and volume of 3.67 m3 when it was 11 years old.
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