Studies on the Primary Productivity of Bamboo (Phyllostachys pubescens) Grove

This paper deals with the primary productivity of medium and high yield bamboo (Phyllostachys pubescens) groves.The results show that the increase of biomass above ground is mainly from newly growing bamboo. the more the new grown-up bamboos, the more the increase of primary productivity of bamboo. Furthermore, the increase of culm-wall density for 1~3 year bamboos has also the influence over the increase of biomass of bamboo groves. Besides, the biomass production of rhizomes and roots has a close connection with the site conditions. The under-ground biomass covers only a small proportion in the bamboo groves, which has a close relation with water and soil fertility. As the site condition becomes worse and management level low,the proportion of under ground biomass will increase.