摘要
通过对Ⅰ-69杨和NL-80203树冠生长特性的分析，对同龄杨树林带抚育间伐技术进行了探讨.研究结果表明，杨树林带间伐起始期可以林带平均高度为依据.对Ⅰ地位级的林带，当初植密度较大（3 m ×4 m）时，可在林带高度达到15 m左右时进行一次性间伐，间伐强度约70%左右;也可在15 m时进行第1次间伐，间伐强度在30%～40%之间，在25 m左右时进行第2次间伐，强度在40%～50%之间.对初植密度较小（5 m×6 m）的Ⅰ地位级的林带，可在林带平均高度达20m时一次性间伐，强度在50%以下，对Ⅱ、Ⅲ地位级的林带，可在林带平均高度为16～20 m左右时进行一次性间伐，间伐后保留木株行距乘积30m^2左右.
According to analysis of crown growth characteristics of two poplar species （ Ⅰ-69 , NL-80203 ）, the paper studied the tending and managing technology of poplar tree belts, It＇ s possible to decide the intermediate-cutting time accordng to the average height of tree belts. To the tree belt on site Ⅰ grade,if the planting density is thick （3 m ×4 m） and the first cutting time is at the height of 15 m,the cutting intensity could be set by 30% ～40% while at the height of 25 m ,the second favorable thinning intensity is 40% ～50%. It is also possible to accept once intermediate-cutting way,that is the cutting intensity is 70% at height of 15 m. At the thin planting density（5 m × 6 m） ,the once thin-cutting intensity could be set by 50% with the average 20 m height of the tree belt. To the trees on site Ⅱ or Ⅲ grade,it is better to begin with once thinning at the average height of 16-20 m. After the practice,the product of row spacing（m） and the spacing in row （m）to the retaining tree belts will be concluded with about 30 m^2.
出处
《江苏林业科技》
2006年第2期32-35,共4页
Journal of Jiangsu Forestry Science & Technology
