摘要
木材密度是决定用材树种木材质量的重要性状。以12~96年生楠木为对象,采用Pilodyn方法对活立木胸径处南北向木材进行探测,结合实测值构建楠木木材材性指标预测模型,以实现楠木活立木材性的快速、可靠评价。结果表明,楠木木材纤维长度、纤维宽度和纤维长宽比分别在629.90~1238.76、13.78~23.95μm和29.83~80.35。纤维长度和长宽比随树龄增加而增加,纤维宽度随树龄增加而降低,而气干密度与树龄无相关性。木材外侧、内侧和整株木材气干密度分别在0.40~0.698、0.13~0.66和0.40~0.57。采用不同回归方程模型构建木材气干密度预测模型,结果显示,Pilodyn测定值与气干密度的指数函数方程的拟合效果最佳,Pilodyn测定值与各木材气干密度间均呈极显著负相关关系(P<0.0001),决定系数R(-0.3002~-0.5184)。虽然pilodyn测定值与纤维长度与宽度呈现出显著的负相关关系,但决定系数均较低(R<0.15),无法保证预测模型结果的准确性。最后,分别构建楠木木材外侧(y=2.4782x^(-0.539))和整株气干密度预测模型(y=0.9538 x^(-0.24)),该预测模型的建立为今后快速无损评估楠木活立木木材密度提供新的思路和方法。
Wood density is an important character to determine the wood quality of timber tree species.Trees of Phoebe zhennan(12-96 years old)were selected as the research objects.The detections were conducted from south and north directions of P.zhennan tree by Pilodyn method to establish the prediction model of wood properties to implement the quick and reliable evaluation of wood properties in P.zhennan living tree.The results showed that the length,width,and length/width ratio of fiber of P.zhennan tree were 629.90-1238.76μm,13.78-23.95μm,and 29.83-80.35,respectively.The fiber length and aspect ratio increased with tree age,fiber width shortened with tree age,and there was no correlation between air-dried density and tree age.The air-dried density of P.zhennan at the outside,inside,and the total tree were 0.40-0.69,0.13-0.66,and 0.4-0.57 g·cm-3,respectively.The results of prediction model of Pilodyn value and air-dried density with different regression equations showed that the fitting effect of Pilodyn value and exponential function equation of air dry density was the best.Pilodyn value was negatively correlated with the air-dried density of wood(P<0.0001),with the determination coefficient R:-0.3002 to-0.5184,and the fitting equation of air-dried density from outside was the best.There were very low R value(R<0.15)in all prediction models of Pilodyn value and the fiber length,width,although there were significant negative correlation between Pilodyn value and the fiber length,and width.Therefore,we could not ensure the accuracy.Finally,we established the prediction models of air-dried density of the outside(y=2.4782x^(-0.539))and the whole P.zhennan wood(y=0.9538x^(-0.24)),respectively.The establishment of the prediction model provides an idea and method for rapid nondestructive measurement of P.zhennan living wood in the future.
作者
彭建
鲁鑫钥
余小晏
刘闵豪
肖兴翠
杨汉波
辜云杰
PENG Jian;LU Xin-yue;YU Xiao-yan;LIU Min-hao;XIAO Xing-cui;YANG Han-bo;GU Yun-jie(Sichuan Academy of Forestry,Ecological Restoration and Conservation on Forest and Wetland Key Laboratory of Sichuan Province,Chengdu 610081,Sichuan,China;Sichuan Provincial Key Laboratory of Ecological Forestry Engineering on the Upper Reaches of the Yangtze River&National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River&Rainy Area of West China Plantation Ecosystem Permanent Scientific Research Base,Institute of Ecology&Forestry,Sichuan Agricultural University,Chengdu 611130,Sichuan,China;Forestry Station of Sichuan Province,Chengdu 614801,Sichuan,China)
出处
《西北林学院学报》
CSCD
北大核心
2023年第6期269-275,共7页
Journal of Northwest Forestry University
基金
四川省科技计划项目(2021YFYZ0032)
四川省自然科学基金(2022NSFSC1062)
世行贷款长江上游森林生态系统恢复项目(2019-510000-02-01-400761)。
关键词
楠木
PILODYN
气干密度
纤维长宽
相关性
Phoebe zhennan
Pilodyn
air-dried density
fiber length and width
correlation
