Study On The Developmental Law Of Phyllostachys Edulis Seedling

The developmental law of Phyllostachys edulis seedlings about the culms and the subterranean stem and biomass was studied in detail, and the evaluation of quality and the choosing of excellent seedling were also discussed. The results are as follows. 1. In the first 4 years, seedling of Phyllostachys edulis transited from clumping bamboo to running bamboo via mixing bamboo. Every year, the times of dividing or sprouting decreased gradually, and the life cycle of young shoots became long increaselly, and the representation degree of seedling transmissibility also increased. 2. When bourgeoning from seed, seedling was a clumping bamboo. In a year, it can divid 4 to 6 times, and The units and quantity of seedling and the area of single leaf or the gross area increased rapidly, which result in the increase of biomass at acceleration quickly. The buds at the basis of subterranean stem of culms first sprouting. At the end of the first year, most buds had developed into strong buds. 3. The bamboo shoots of many years old seedlings sprouted 2 –3 times in the first year. With aging, the time of sprouting decreased gradually until only one time. With aging, new culms became increasely high and did the main component of bamboo clump, and individual leaf area decreased but the gross area of leaf increased rapidly. The pruning can accelerate the sprouting of new branches and the growth of leaf, but different method of pruning has no impact on seedling clump. The number of new branches of the seedlings stayed in nursery rapidly decreased every year. 4. The buds at the culm base of seedlings decreased with aging, and most developed into scourges in the end. The sprouting rate of the buds at the culm base in forestated seedling was high but that of seedling stayed in nursery was very low. Simultaneousely, the number of bmboo scourge and units of forestated seedling increased gradually, but that of seedling stayed in nursery decreased rapidly and the unity became more big. In a year, the bamboo scourge grew the most rapid in autumn. The buds of new scourge sprouted from the base on, and the sprouting ratio was very low. In 2 to 3 years, the sprouting ratio of buds of old scourge in forestated seedling was higher than that of seedling stayed in nursery. 5. The biomass of forestated seedling increased quick, but that of seedlings stayed in nursery did slowly. The growth order of all nutrient components of bamboo seedling was the subterranean stem, culm, branch, leaf, scourge and root, and the increase order of biomass of that was similar to the former. In the gross biomass of a seedling clump, the proportion of branch and culms biomass in forestated seedling increased with aging but that in seedling stayed in nursery decreased. The proportion of bamboo leaf decreased, but that of scourge and root increased. The ratio of overterranean part to subterranean part increased first and then decreased, but the whole trend is downtrend with aging. 6. Based on the investigation and analysis of the developmental law of 1 to many years old seedlings, the quality evaluation system and the quality criterion of Phyllostachys edulis seedling were built. According to the quality criterion, the excellent seedlings of 3 types533 clusters were chosen to transplant. As to the cultivation of seedling, 3 proposals like decreasing the density of cultivation, prolonging the cycle of cultivation and choosing excellent seedling were brought forward.