摘要
甘肃子午岭林区油松中龄人工林郁闭,林分结构不良,长势衰减。以甘肃子午岭林区中龄油松人工纯林为对象开展单因素多水平对比试验,通过林木生长、灌草层变化分析疏伐效果,探索适宜的疏伐强度。结果表明:甘肃子午岭林区中龄油松人工林适宜疏伐强度为40%,伐除全部Ⅴ、Ⅳ级木和半数Ⅲ级木,伐龄3 a林木胸径可增加约2.5 cm,灌木层、草本层盖度可分别增加约19.8、11.9百分点,物种数量可增加7个左右。
The growth of middle-aged Pinus tabuliformis in Ziwuling forest area in Gansu province developed slowly,the stand structure was poor,and the overall trend was attenuated.A single factor and multi-level comparative experiment was carried out to analyze the thinning effect and explore the appropriate thinning intensity through the changes of tree growth and shrub layer in the middle-aged pure Pinus tabuliformis plantation in Ziwuling forest area in Gansu Province.The results showed that the suitable thinning intensity of middle-aged Pinus tabuliformis plantation was up to 40%.Besides,if all Ⅳ-grade、Ⅴ-grade trees and half of Ⅲ-gradtrees were removed appropriately,the 3a Pinus tabuliformis could be increased by about 2.5 cm,the cover of shrub layer and field layer could be increased by about 19.8 percentage points and 11.9 percentage points respectively;the number of species could be increased by about 7 approximately.
作者
殷姣姣
徐建民
方圆
张文欢
张林涛
齐雪燕
毛正飞
YIN Jiaojiao;Xu Jianmin;FANG Yuan;ZHANG Wenhuan;ZHANG Lintao;QI Xueyan;MAO Zhengfei(Qingyang Forestry Research Institute,Qingyang Gansu 745000,China;Dashanmen Forest Farm,Heshui Branch of Ziwuling Forestry Administration,Heshui Gansu 745400,China)
出处
《甘肃林业科技》
2022年第3期7-9,共3页
Journal of Gansu Forestry Science and Technology
基金
“油松人工林多功能经营技术示范推广”(甘肃省财政林业和草原科技创新与合作项目)
“油松人工林多功能经营技术试验研究”(甘肃省林业和草原科技计划项目,2021kj028)。
关键词
子午岭
油松
人工林
疏伐
Ziwuling
Pinus tabuliformis
plantation
thinning
