A study of the interannual succession rule and influential factors of young stands structures of Phyllostachys pubescens

Key words: 
• silviculture /
• Phyllostachys pubescens /
• stand component /
• succession

Abstract: Long-term fixed site observation was conducted based on the large-scale planting of bamboos in the hilly areas of western Zhejiang to study the succession rule and main factors affecting the components of young stands of Phyllostachys pubescens .The results showed that density and DBH were the dominating factors for the interannual changes of component ;LH was the subordinating factor .After one-to-five-year planting , the subterranean stems of bamboo were mainly distributed in 10 -20 cm deep soil layer .With the prolonging of the planting years , the 20 - 30 cm deep soil layer became the main distributing layer for the subterranean stems .The diameters of the subterranean stems were becoming larger and larger until they were stabilized in the fourth year .The average length of a stem joint was relatively stable .The number of living sprouts and the total length of subterranean stem were significantly relative to the average length of a stem joint , which took on a tendency of linear increase .The land types , afforestation modes , cultivating measures , quality of mother bamboos and the original planting density were the main influential factors for the components of the bamboo forest .It is suggested that the mixed planting mode should be adopted and the original planting density should be increased .[ Ch , 2 fig .6 tab .11 ref .]