Study on Structure Optimization of Dendrocalamus brandisii Shoot and Stock-Producing Stand

Dendrocalamus brandisii,an excellent bamboo species,has been extended in many adapted areas in china,and the main propagation method is to transplant by clone.Based on ecological theories about physiological integration characteristics and taking structure adjustment of bamboo stand as key technique,different stand composition patterns were adopted to probe into the optimal management patterns for shoot and stock-producing stands.The results of study are as follows:(1)New-built bamboo stand had a distinct period when the quantity and quality of shoot increased rapidly.In the first 3 years,both the quantity and quality of shoot increased rapidly,then the individual quality of shoot kept stable while the quantity kept increasing.(2)The key factors affecting the yield of shoot were the quantity and DBH of living culm,which determined the quantity and quality of shoot.The quantity of shoot product was positively correlated with the quantity of living culm,and negatively correlated with the quality of individual shoot.The dbh was positively correlated with the individual quality of living culm and was not correlated with the quantity of shoot.(3)With the optimal stand structure,when the stand density was 450 culms per hectare,the clumping living bamboo should be 10 culms with dbh 4-6 cm.(4)The economic benefits of management was obvious.The bamboo stand began to produce shoot and stock in the next year after the bamboo stand was established and entered high-yielding period from the 4th year on.