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以山东省重点推广的L35、I-107、W-141、中菏1号4个杨树无性系为材料,对密度(417株/hm2)相近的3种不同株行距配置方式(株距×行距:3 m×8 m、4 m×6 m、5 m×5 m)杨树的生长及光合特性进行了研究。研究结果表明:不同配置的杨树树高和冠幅差异不显著,5 m×5 m配置杨树的胸径、胸高形数、单株材积要明显大于其他两种配置,3 m×8 m配置杨树的最小;5 m×5 m配置各断面的离心率要小于其他配置,3 m×8 m配置杨树最大。株行距差值越小,杨树的光合速率、蒸腾速率、水分利用率越大。在种植密度相近的情况下,正方形株行距种植更有助于杨树充分利用空间。
Taking the four poplar clones of L35, I-107, W-141 and Zhonghe No.1, which were popularized in Shandong Province, as materials, the arrangement of row spacing of three different plants with similar density (417 plants / hm2) : 3 m × 8 m, 4 m × 6 m, 5 m × 5 m) The growth and photosynthetic characteristics of poplar were studied. The results showed that the height and crown width of poplars with different configurations were not significantly different. The chest diameter, chest height and chest volume of poplar with 5 m × 5 m configuration were significantly larger than those of the other two configurations. Poplar trees with 3 m × 8 m Of the minimum; 5 m × 5 m configuration eccentricity of each section is smaller than the other configurations, 3 m × 8 m configuration poplar maximum. The smaller the row spacing difference, poplar photosynthetic rate, transpiration rate, the greater the water use efficiency. In the case of similar planting density, square row spacing planting is more conducive to make full use of poplar space.