Most structural timber species now used in the North China's rural areas are poplar, willow, elm etc, which are fast growing trees but whose woods are very susceptible to biological deterioration.

我国北方农村的建筑用材，多以杨、柳、榆等速生树种为主，但这些木材易发生腐朽与虫蛀。

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Rheological properties of the flakes of poplar and oak woods cut with knives of various rake angles were studied by applying the method of parameter separation.

以不同前角刨刀切制两种杨木和柞木刨片，根据参数分离法，对其流变性能进行了测定和研究。

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The experimental places included the poplar woods, the lawn, and the clove shrub.

试验样地包括杨树片林、禾本科草坪和以丁香为主的灌木林。

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