Research on the Growth Characters of Toon sinensis in Sichuan and the Division of Cultivation Areas

In this paper,the stem analysis and measured sample data were used to fit the Toona sinensis growth model in Sichuan Province and studies were made of Toona sinensis growth characteristics and cultivation zones in Sichuan. The results showed that the Chinese toona tree had obvious early fast-growing characteristics,from 5 years old to 12 years old its tree height growth was rapid.Chinese toons tree height growth rate was the fastest in mountain regions around the Sichuan Basin,the next in Southwest Sichuan mountain and the slowest in the hilly areas.In 5 years~20 years its DBH growth was more rapid,in 21 years~30 years its DBH growth slowed down.The average DBH growth rate in mountainous areas in Southwest Sichuan was the fastest,followed by mountainons areas around the Sichuan Basin,and was the slowest in the hilly areas.The toon a tree volume in 10 years~30 years showed a rapid growth.its volume mature age happened after 20 years.Its volume average growth speed in southwest mountainous regions of Sichuan was the fastest,followed by the basin mountain,and was the slowest in the hilly areas.In Southwest Sichuan mountain areas,the growth of Toona sinensis was the best.Toona sinensis plantation in the barren hills had broad development prospects.In this paper,the cultivation areas of Toona sinensis in Sichuan were redivided,aiming to provide scientific basis for oriented cultivation of plantations.