Study On Growth Characteristics Of Clonal Population In Dendrocalamus Farinosus

At present, study on population ecology of clonal plants is one of the vital fields to plant ecology study. Bamboo ramet growth into bamboo stand are depends on the extensive rhizome-root system, which has strong breed power. Bamboos are one of the best materials studies on population ecology of clonal plants. The boom of population ecology of clonal bamboos study not only enrich the study contents of population ecology of clonal plants, but also lay the foundation for the theoretic base of bamboo forests cultivation Dendrocalamus farinosus is used both in bamboo shoots and timber, it is one of the most important bamboo resource in China. There is no paper shows about study on population ecology of clonal plant in D. farinosus today, so studying on growth characteristics on it is full of means.1.The period of shooting may last 71 days from start to end, it started form beginning of July, it can be divided 3 stages, which are respectively: initial stage (July 7 to July 23) , bloom stage(July 24 to Aug 28) and final stage(Aug 29 to Sep 17). The shooting rate of respective stage are 20.88%, 66.59% and 12.53%. The death rate of D. farinosus is 67.69% while the survival rate of bamboo shoots is 32.31%.The growth from bamboo shoots to young bamboo accords with the rule that slow-fast-slow, it accords with Logistic too. It will take 104 days to finish growth form start to end. Form the 32d to the 76th was the bloom time of growth, in this stage ,it finishes 73.48%of the whole growth. The growth of day time was 1.13 times of growth of night. The main reasons of bamboo shoots death are non-nutrition, diseases and pests, the time of bamboo shoot coming, age and quality of mother bamboo. The growth of basal diameter would take 42 days, diameter at breast height would take 58 days .It shown the rhythm slow-fast-slow-end. The temperature and moistureare the main constrain factors.2. The main trend of age structure of D. farinosus clone population is that the ratio of clone ramets were gradually reducing along with the increase in age, in among, the fourth age class occupied 20.78%, while the first age class was most accounting for 28.57%.It shown that the age structure of D. farinosus clone population is positive Pyramid form, it is a rising structure.3. We can predict the biomass of modular and ramets of D. farinosus by stimulating the modular biomass with DBH or its square product with height. The optimizing modular are:Culm W=66.773(D_1.3²H)0.674, Branch W=7.223(D_1.3²H)0.794, Leaf W=5.93 D1.32.567, Under ground W=113.266+1.19(D_1.3²H) , Over ground W=493.671+13.391(D_1.3²H),Total W=12.736-6564.978 D1.3 +967.549 D1.32. The ramets biomass of D. farinosus can be ranked in ages, the order is 2 year old > 3 year old>1 year old>4 year old. The culm biomass occupies the most biomass of clonal population, it is 64.47%, so it certifies that the culm is the main organs which stores nutrition while the biomass of leaf occupies the least biomass of clonal population, it is 8.09%. The biomass of over ground occupies 84.73% of the whole biomass, in which , culm >branch>leaf. The biomass of under ground occupies 15.27% of the whole biomass.4. The leaf area index of D. farinosus is 12.75. We can find the relationships between relative diameter and relative height, DBH and breast height culm thickness, relative culm length and number of culm by studied the structure of culm form.