车筒竹地上生物量分配格局及秆形特征

Over-ground biomass distribution pattern and culm form characteristics of Bambusa sinospinosa

为评价大型丛生竹种车筒竹Bambusa sinospinosa作为板材原料的适宜性,以毛竹Phyllostachys pubescens为参比竹种,研究了车筒竹地上生物量分配格局及秆形特征。结果表明:车筒竹地上各器官中,竹秆的生物量比例最大,占72.7%,其次为竹枝(15.9)和竹叶(11.4%);秆形特征主要分析了胸径、秆高、秆质量、尖削度和竹壁厚等参数,其中,车筒竹全高(y/m)对胸径(x/cm)拟合的直线方程为y=1.345 6x+1.706 8(R2=0.954 6,P=0.000 0)。与毛竹相比,在胸径小于8 cm时,车筒竹全高比毛竹略小,而随着胸径的增大,全高逐渐大于毛竹;车筒竹秆鲜质量(y/kg)对胸径(x/cm)拟合的幂函数曲线为y=0.138 2x2.4812(R2=0.975 5,P=0.002 2),大于相同胸径下的毛竹秆质量;从秆径和壁厚在竹秆纵向部位的变化看,车筒竹尖削度小于毛竹,而壁厚变化则相对较快。综合分析来看,车筒竹作为竹板材原料竹种具有较大的开发前景。

To evaluate the suitability for board-making of Bambusa sinospinosa which is one of the large sympodial bamboos, the biomass distribution pattern of organs over-ground and culm form characteristics of Bam- busa sinospinosa were studied and compared with those of Phyllostachys pubescens. The results showed that among the organs over-ground, the culm biomass was 72.7%, much more than those of the branches （15.9%） and leaves （11.4%）. The characteristic indexes of culm form included diameter at breast height （HDB）, culm height, culm weight, culm taper, wall thickness. The model of whole culm height（y, m）to HDB（x, cm）was y = 1.345 6x ＋ 1.706 8（R2 = 0.954 6, P = 0.000 0）, and when culm was thin （HDB 〈 8 cm）, the whole culm height was a little smaller than that of Ph. pubescens, however, it was becoming higher as HDB increased （HDB≥8 cm）. The model of fresh culm weight （y,kg） to HDB （x, cm） was y = 0.138 2x24812（R2 = 0.975 5, P =0.002 2, and the culm weight was heavier than that of Ph. pubescens with the same HDR. About the vertical change of culm diameter and wall thickness, the taper was smaller than that of P. edulis, but the thickness changed a little faster. Thus, Bambusa sinospinosa has a larger development prospects as raw materials. [Ch, 5 fig. 3 tab. 21 ref.]