山西北部杨树人工林更新技术

The Regeneration Technique of Poplar Plantation in Northern Shanxi

对山西省北部桑干河两岸的杨树成、过熟人工林,用6种更新技术进行采伐后,测定了其萌条的树高、胸径及蓄积量,结果表明：桩萌单株对增加树高生长量、胸径效果最好,但对蓄积量无明显增加效果;而根萌三株、桩萌双株可显著增加林木蓄积量;桩萌更新时原林木的根系没有受到机械损伤,而且与常规的造林方法相比,费用较低,每株少支苗木费、区划费、挖坑费、栽植费、采伐费约6.1元,少投资1 695元/hm^2-3 392元/hm^2,桩萌单株更新方法是最理想的更新方法。

Mature and over-mature plantation of poplar grows on sides of Sanggan river in northern Shanxi were regenerated by using six cutting treatments. Height and DBH and volume of regenerated trees were determined. The results were showed as follows ： single stake sprout has best effects on tree growth and DBH but has no obvious increase to volume; whereas three stump sprouts and double stump sprouts can significantly increase the volume. The regeneration of cutting stump will not mechanically damage the roots of original trees and it also has lower costs than conventional planting method, the regeneration of single stake sprout is the best method for regeneration. About cost of 6.1 yuan per tree can be saved in the process including seedling, layout, digging, planting and cutting, and 1 695 yuan-3 392 yuan can be saved per hectare.