The Clonal Growth Characteristics Research Of Phyllostachys Heterocycla Cv. Pubescens Clonal Population

This was well investigated in clonal grass, but known little in giant clone specie such asPhyllostachys heterocycla cv. Pubescens, the analysis and research of the Phyllostachys heterocycla cv.pubescens underground rhizomes clone growth characteristics.The rhizome characteristics(cloningconfiguration characteristics, topology structure, age structure and quantitative characteristics, etc) ofPhyllostachys heterocycla cv. pubescens was investigated by digging method in situ in differentmanagement intension (stem harvesting pattern-SH, mixed mode with the two intension-MM，shootfood harvesting type-SFH). The fractal theory and topology analysis were used to research rhizomeclone growth characteristics,and ramets and rhizome biomass were also discussed. The mainconclusions are as follows:1. Branching intensity of rhizome was significantly difference in different management patterns, asindicated SFH> MM> SH, which was consistent with high, middle and low level of rhizome severing.Branching angles were different from frequency distribution among three patterns, which indicated thatPhyllostachys heterocycla cv. pubescens plastically responded to soil heterogeneity by changingbranching angle. Continuous fertilization application (12–14years) increased total rhizome length forboth SFH and MM. The length of internodes and rhizome diameter were all characterized asMM>SFH> SH which was not consistent with the level of rhizome severing and fertilization and soilheterogeneity (SFH> MM> SH). However, significantly allometric functions were met by relatinglength of internodes or rhizome diameter to ramets diameter at breast height. More biomass wasrelatively allocated to rhizome for SH that had one year fertilization, but this was adverse for SFH orMM that had long time fertilization (12–14years).2. The number of lateral bud attached on underground rhizome of Phyllostachys heterocycla cv.pubescens was averaged104.21per square metre, the distribution of lateral bud in various intensionwere weak bud (22.17%), strong bud (35.75%), bamboo bud (10.39%), digged bamboo bud (21.61%),left bud mark (10.08%), the total lateral bud number of Phyllostachys heterocycla cv. pubescens was notsignificant difference between three management intension. Among lateral buds, strong buds ordered bySFH (accounted for31.03%)<MM (accounted for32.05%)<SH (accounted for44.16%), there wasnot significant difference between each other, but strong and bamboo bud number distributed indifferent rhizome age of Phyllostachys heterocycla cv. pubescens had significant difference betweenthree management intension, and mainly assigned to3-4years rhizome for SFH,5-6years rhizome forMM or SH.3. The fractal dimension values of underground rhizome in three management intension were1.84±0.01(SFH),1.89±0.002(MM) and1.85±0.02(SH), respectively, which indicated that rhizome ofPhyllostachys heterocycla cv. pubescens had a highly special occupation ability for getting moreresources. Topological index in different management intension were all closely to1.0which showedrhizome branching is simple herringbone structure. The rhizomes of Phyllostachys heterocycla cv.pubescens branching structure were not significant differences between three management intension. The total length, total volume, branch angle were all significantly positively correlated to fractaldimension and fractal abundance by Pearson correlation analysis, which showed that these parameterswere important in stating occupation ability of rhizome of Phyllostachys heterocycla cv. pubescens inthe soil spatial resources.