Pilodyn在日本落叶松活立木材性指标预测中的应用

Using the Pilodyn to Assess Wood Traits of Standing Trees Larix kaempfri

在野外利用Pilodyn对日本落叶松活立木南北向木材进行了探测,在室内测定了木芯的基本密度及早晚材的管胞长度和管胞宽度,用Pilodyn探测数据和实际密度建立了回归方程,并用该方程和其他的Pilodyn探测值预测了对应活立木的木材密度。结果表明:日本落叶松Pilodyn南向探测值Ps为15.50 mm,比北向平均值Pn高5.5%。Pn、Ps和Pa与外侧木材的平均基本密度(Dao)呈极显著负相关,相关系数比Pn、Ps和Pa与整株木材的平均基本密度(Da)的大。Pn、Ps和Pa与胸径呈极显著负相关,胸径与北向探测值(Pn)的相关系数较胸径与南向探测值(Ps)的高。木材基本密度对Pilodyn探测值的贡献率最大(40.4%)。Pa与Da和Dao均存在极显著的负相关关系,显著性概率P=0.000 1。日本落叶松Pilodyn探测值(Pa)与晚材管胞长、宽存在极显著负相关关系。采用Pilodyn探测值(Pa)能够很好的预测日本落叶松活立木外侧木材基本密度(Dao)和晚材的纤维长度和纤维宽度,也能够预测整株木材的基本密度(Da)。

The standing tree of Larix kaempfri was penetrated with Pilodyn in both south and north directions in the field, and the wood basic density, fiber length and width of increment core were menstruated in laboratory. Through the analysis of Pilodyn penetration, the basic density of increment core, fiber length and fiber width, the result showed that the average of the Pilodyn penetration of Larix kaempfri in south direction was 15.50 mm, which was 5.5% higher than that in north direction. Pilodyn penetration Pn, Ps, and Pa had a significant negative correlation with the outerwood density （Dao）. The correlation coefficient was higher than that between the Pn, Ps, Pa and the basic density. Pn ,Ps and Pa had a significant negative correlation with breast diameter（DBH）. The correlation coefficient between breast diameter（ DBH） and Pilodyn penetration in north direction was bigger than mat m south direction. The biggest contribution rate to the Pilodyn penetration was basic density（40.4% ）, and Pa had significant negative correlation with both Da and Dao, the significant probability was P = 0.000 1. The Pilodyn penetration （Pa） of Larix kaempfri had a significant negative correlation with wood fiber character（ later wood fiber length and later wood fiber width）. The Pilodyn penetration could estimate the average of outerwood density （Dao） and fiber length and fiber width of laterwood in an entire radial direction in standing tree of Larix kaempfri, and it could also estimate the basic wood density （Da）in an entire radial direction.