川南地区3种丛生竹竹秆特性研究

为给蓬勃发展的丛生竹生产提供理论参考,以川南地区人工栽培的3种丛生竹材用林为研究对象,研究其竹秆特性,测量胸径、全长、秆高、尖削度、竹壁厚、节间长等指标。对各指标间相关性进行了分析,并拟合回归模型。结果表明,胸径与竹秆高度、秆质量、总节数等因子相关性显著,拟合的模型经F检验均达到极显著水平。在相同胸径下,全长方面,硬头黄竹>梁山慈竹>撑绿竹;秆质量方面,硬头黄竹秆质量最大,梁山慈竹和撑绿竹相当,约70%的秆质量都集中在中下部。随着竹秆相对高度上升,相对壁厚的下降速度依次为硬头黄竹>梁山慈竹>撑绿竹,相对直径大小为梁山慈竹>硬头黄竹>撑绿竹,但在相同胸径下,硬头黄竹胸径处的竹壁最厚。

Culm characteristics of three sympodial bamboo species in south Sichuan

In order to provide reference and theoretical basis for the development of sympodial bamboo production, three sympodial bamboo plantations (Dendocalamus farinosus, Bambusa pervariabilis×Dendrocalamopsis daii, Bambusa rigida) growing in southern Sichuan were taken for research objects. DBH, total length, culm height, culm tapering, wall thickness, internode length were studied respectively. Correlation analysis and regression model simulator showed that the correlation of DBH and the other culm characteristic factors, culm height, culm weight and whole node reached significant level. Comparative analysis revealed B.rigida had maximal total length at the same DBH, then was D.farinosus, B.pervariabilis×D.daii the lowest. For the culm weight, B.rigida had the largest weight, whereas, D.farinosus and B.pervariabilis×D.daii was nearly equival. The results showed more than seventy percent of culm weight distributed in the middle and lower part. With the rise of the culm height, the descending rate of relative wall thickness was B.rigida>D.farinosus>B.pervariabilis×D.daii and relative diameter was D.farinosus>B.rigida>B.pervariabilis×D.daii. B.rigida had the biggest wall thickness at the same DBH compared with D.farinosus and B.pervariabilis×D.daii.