实心狭叶方竹种群的生物量结构与地下茎生长规律研究

依据Harper的构件生物结构理论和种群生态学方法,对实心狭叶方竹种群的生物量结构和地下茎生长规律进行了研究.结果表明:(1)实心狭叶方竹种群各构件单位的生物量配置为:秆(36.30%)>叶(21.13%)>枝(17.82%)>篼(13.43%)>鞭(10.18%)>根(1.14%).其中地上部分生物量占75.25%,主要集中在1～3龄;不同年龄地上部分各构件单位的生物量分配有较大差异.秆、枝、叶的含水率均以1年生新竹最高,并随年龄的增长而逐渐减小.(2)实心狭叶方竹秆基、秆柄和竹鞭等地下茎各构件较小;秆基和竹鞭上萌芽转化为壮芽的成功率较低;竹鞭主要生长在0～15 cm的土层,幼壮龄鞭有趋浅的动态,不利于其无性系种群的克隆生长,可能是导致其种源稀少的原因之一.

The Bioma ss Structure and the Pa ttern of Subterranean Stem Growth ofCh im onobam busa angustifolia f. reple tea Clone Popula tion

According to the theory of component framework and the methods of population ecology, the biomassstructure and the pattern of subterranean stem growth of Ch im onobam busa angustifolia f. repletea clone populationwas studied systematically. The results were as follows: ( 1 ) The biomass allocations ratios among culm, leaf,branch, bamboo stump, subterranean stem, root were 36. 30%, 21. 13%, 17. 82%, 13. 43%, 10. 18% and1. 14% respectively. Thereinto, the biomass of aboveground parts accounted for 75. 25% mostly focused on theramets from 1 to 3 a. The biomass allocations of aboveground parts varied with age. The water content of culms,branches and leaves of C. angustifolia f. repleta would decrease with aging. (2) The components of subterraneanstem of C. angustifolia f. repleta were smaller, and itwas difficult for the buds on culm base and bamboo stump totranslate into strong buds, and the subterranean stemsmainly distributed in the shallow soil of 15 cm dep th, whichwas unfavorable to its clone growth resulting in the sparsity of species.