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根据对泗阳县南方型杨树林分调查结果表明 ,栽植密度对杨树生长量的影响十分明显 ,经济效益差异也很显著 ,建议对林龄 (或树龄 )未超过 4a的栽植密度不合理的林地进行密度调整。具体做法 :对 4m× 7m的成片林 ,每隔 3株间伐 1株 ;对小片林 ,若栽植的是 3行 ,将其株距进行调整 ,保持每株营养面积 30m2 左右 ;若栽植的是 3行以上 ,对密度为 1 5m× 1 5m和 2m× 2m的进行间伐 ,使其成为 6m× 6m的株行距 ,对密度为 2 5m× 2 5m的进行隔株隔行间伐 ,将其调整为 5m× 5m呈三角形的配置模式。对双行杨树 ,尽量将其株行距调整接近 4m。对林龄超过 5a以上 ,栽植密度不合理、生长又较差的林地或“四旁”林 ,可在采伐后按适宜密度重新栽植
According to the survey of southern Poplar Forest in Siyang County, the results showed that the planting density had obvious effects on the growth of poplar, and the difference in economic benefits was also significant. It is suggested that the planting density of unreasonable forest land with the age of 4 years or less Density adjustment. The specific approach: 4m × 7m into a piece of forest, cut between every 3 strains of 1; small pieces of forest, if planting is 3 lines, the spacing will be adjusted to maintain the nutritional area of about 30m2 per plant; if the planted is 3 Row, the density of 15m × 15m and 2m × 2m for the thinning, making it 6m × 6m row spacing for the density of 25m × 25m inter-plant spacing for inter-cut, it is adjusted to 5m × 5m triangular configuration mode. Poplar on the double line, try to adjust the spacing of its lines close to 4m. For more than 5 years of age, planting density is not reasonable, poor growth and the forest or “all around” forest, logging can be planted at the appropriate density