Butt rot is a main defect in Norway spruce (Picea abies (L.) Karst.) trees and causes large economic losses for forest owners. However, little empirical research has been done on the effects of but...

中文翻译：

---

挪威云杉树根腐病造成的经济损失

根腐病是挪威云杉 (Picea abies (L.) Karst.) 树的主要缺陷，给森林所有者造成巨大的经济损失。然而，关于但……的影响却很少有实证研究。