杨树生长快,出材率高,在造林中占有重要地位,是我国主要用材树种之一。十几年来,我们通过引、选、育种等途径,选育出一批生长优良的杨树新品种。为了摸清它们的材质情况,先后对19个杨树新品种做了木材物理力学性质的测定,并与山杨成材进行了比较。试材分别取自:(1)栽培在砂壤土地段上,密度为2×2米(栽后第三年间伐为2×4米)的试验林内5年生杨木,试件取树高4.6米以下;(2)栽培在粘壤土地段上,密度为2×2米 Poplar grow fast, a high yield of timber, in the afforestation occupies an important position, is one of the main timber species in our country. In the past decade or so, we have bred a number of new poplar varieties with excellent growth through such methods as citation, selection and breeding. In order to find out their material situation, the physical and mechanical properties of 19 new poplar varieties were determined and compared with that of Populus. The test materials were taken from: (1) Five-year-old poplar cultivated in sandy loam area with a density of 2 × 2 m (2 × 4 m during the third year after planting) The following; (2) Cultivation in clay loam section, the density of 2 × 2 meters