Studies On Basic Biological Characteristics Of Phyllostachys Pubescens Located In Chongyang

With Phyllostachys heterocycla stands located at Guihua forest farm state-owned in Chongyang, Hubei province, a research has been carried out into phenol phase, effect of characteristics of mother bamboo on both Newd bamboo and underground rhizome after transplanted, suitable management density of bamboo, biomass of both bamboo and underground rhizome based on plots. Main research conclusion were as follows:(1) Bamboo phonological period can be divided into6stages:rhizome bud germinating stage occuring in spring; bamboo shoot stage from march to early April; new bamboo growing stage in spring taking1～2month; new bamboo growth with characteristics height, DBH and volume growing to their maxuime; new rhizome growth stage from August to November; leaves fall stage from December to March next year, and bamboo leaves fell every two years in which bamboo shoots were less as a small-year, afterwafe big-year followed because of new leaves with stronger photosynthesis and nutrient accumulation; flowering stage from April to Octorber with the characteristics of dead for Phyllostachys heterocycla lifetime being50years.(2) Bamboo propagation being mainly by rhizome, having good command of characteristics of rhizome would be much better to select maternal bamboo as propagation mother bamboo. For shooting number, mother bamboo with3year was bigger than that of1or2years mother bamboo; mother bamboo with DBH>4cm was bigger than that of DBH<2cm or2cm<DBH<4cm; mother bamboo planted in2009was bigger than that in2010,2011and2012;1year rhizome was bigger than that of2or3year rhizome.(3) suitable densities for different purpose stands (timber bamboo stand, shoot bamboo stand, timber and shoot bamboo stand) were different, therefore, the suitable density for timer bamboo stand should be2703stem/hm2(180per acre); the suitable density for shoot bamboo stand be1823stem/hm2(122per acre); the suitable density for timber and shoot bamboo stand be2155stem/hm2(144per acre)(4) biomass of branch, leaf, culm, rhizomes, stump and root were394.02g,919.64g,8586.16g,132.41g,6083.54g and842.79g, and accouting for total biomass were7.76%,5.12%,47.81%,7.4%,33.88%and4.69%, repectively.(5) both weight and proportion of rhizome were in order:mid age rhizome> young age rhizome> old age rhizome; numbers of strong rhizome bud, weak buds, shoot buds and dormant buds were37.43,11.55,28.34and4.34, accounting for the total bud number24.64%,13.98%,26.88%and3.19%, respectively. When strong bud was in high proportion, it illustrated the rhizome system being vitality.For fine root of each order, the biomass, root diameter and root length in both different soil layer and different slope were in following order:Grade1> Grade2> Grade2x> Grade3; but the specific root lengths of different order fine root were upside down.