不同混生地被竹生物量分配与积累特征研究

为阐明不同竹种生产力和种群更新能力差异，选取9种混生地被竹种进行竹苗盆栽试验，分析2个生长周期内各竹种竹苗生物量分配与积累规律，为优良混生地被竹经营管理和推广应用提供参考。结果表明：1）各竹种第1年竹根生物量，第2年竹鞭、竹根、竹叶生物量显著影响了竹种总生物量积累率（P<0.05）；2）以5~6 cm长育苗小鞭段为基本统计和比较单位，大叶竹种美丽箬竹（Indocalamus decorus）第2年总生物量高达36.51±2.13 g，小叶竹种翠竹（Sasa pygmaea）第2年总生物量仅15.36±1.34 g，两者差异显著（P<0.05）；3）美丽箬竹、黄条金刚竹（Pleioblastus kongosanensis f. aureostriaus）等大叶竹种总生物量积累率明显高于菲白竹（Sasa fortune）、翠竹等小叶竹种（P<0.05）。研究发现：1）竹子在不同更新世代出现了不同的生物量分配策略，以使竹子种群快速拓殖；2）大叶地被竹种生物量、生物量积累率均明显大于小叶地被竹种，在一定生长期与环境条件下，大叶地被竹种环境适应能力可能高于小叶地被竹种。

Biomass Allocation & Accumulation Characteristics of Different Amphipodial Dwarf Bamboos

In order to clarify the difference in productivity and population renewal ability of different bamboo species, 9 amphipodial dwarf bamboo species were selected for pot experiment of seedlings, and the biomass allocation and accumulation of these bamboo seedlings in two growth cycles were analyzed, which could provide references for management and popularization of good amphipodial dwarf bamboos. The results showed that:(1) The total biomass accumulation rate of all the bamboo species was significantly affected by the biomass of bamboo root in the first year and the biomass of bamboo rhizome, root and leaf in the second year (P< 0.05); (2) With the rhizome fragments 5-6 cm long of breeding seedlings used as basic statistical and comparative units, the total biomass of Indocalamus decorus Q. H. Dai reached 36.51±2.13 g in the second year, while that of Sasa pygmaea (Miq.) E. G. Camus in the second year was only 15.36 ±1.34 g, and there was significant difference between them (P<0.05); and (3) The total biomass accumulation rates of I. decorus, Pleioblastus kongosanensis f. aureostriaus Muroi et Yuk. Tanaka and other large leaf bamboo species were significantly higher than those of S. fortunei (Van Houtte) Fiori, S. pygmaea and other small leaf bamboo species (P< 0.05). The study found that:(1) Different biomass allocation strategies have emerged in different renewal generations of bamboo in an attempt to better achieve the rapid colonization of bamboo population; and (2) The biomass and biomass accumulation rate of dwarf bamboo species in large leaf were significantly higher than those in small leaf, and under certain growth periods and environmental conditions, dwarf bamboo species in large leaf might have better environmental adaptability than that in small leaf.