Study on Variation of Wood Anatomy Features and Their Relationships with Growth Strain in Larix Gmelinii (Rupr.)

• 1、School of Forestry and Landscape Architecture, Anhui Agricultural University

Abstract：In this paper，4 trees aged 20-year-old of Larix gmelinii (Rupr.) from Fang-Zheng forest station in Harbin city of Heilongjiang Province were selected as the material. The anatomical features variation pattern and their relationships with growth strain were analyzed. The results showed that: 1/ The average tracheid length of Larix gmelinii was 2125.43μm, the average tracheid width was 35.06μm, the average ratio of length to width of wo od tracheid was 60.67, the average ratio of cell wall to lumen of wood tracheid was 0.33 and the average mircrofibrillar angle of wood tracheid was 27.37 °. It belongs to the long fiber, which is suitable or the pulp and paper fiber raw materials. 2/The radical variation pattern of tracheid length belongs the type of Panshin II; The tracheid width and the ratio of tracheid length to width increased gradually from pith to bark; The ratio of the cell wall to lumen increased from pith outward with fluctuation and the mircrofibrillar angle decreased gradually. 4/ The Inner residual growth strain decreased with tracheid length, tracheid width and ratio of tracheid length and width, there existed negative correlation (r=0.8344, 0.7616, 0.6158, respectively), except ratio of cell wall to lumen; There existed positive correlation between inner residual growth strain and microfibrillar angle ( r=0.6110).

Keywords： Larix gmelinii (Rupr.) Anatomical features Inner residual growth strain Variation pattern Relationships