Effect of half-systematic and systematic thinning on the increment of Scots pine and Norway spruce in Finland
Effect of half-systematic and systematic thinning on the increment of Scots pine and Norway spruce in Finland
复制标题
半系统间伐和系统间伐对芬兰赤松和挪威云杉增量的影响
DOI：
--
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Timo Hongisto
中科院分区：
文献类型：
--
作者：
H. Mäkinen;A. Isomäki;Timo Hongisto
樟子松（Pinus sylvestris L.）和挪威云杉（Picea abies（L.）喀斯特。）林分进行了调查，在芬兰南部的长期间伐实验。测定周期平均为19年，间伐分为5种不同的处理：（1）不间伐;（2）选择性自下而上间伐，间伐强度按株数确定;（3）选择性自下而上间伐，间伐强度按林分断面积确定;（5）半系统间伐，即每隔一定的间隔开辟廊道，其余的条带从下而上进行间伐，即选择性间伐和系统性间伐相结合。苏格兰松的选择性（断面积）变薄导致体积增长减少约12%，但在挪威云杉，它导致没有显着减少与unthinning地块相比。在这两个树种中，半系统性和选择性（断面积）间伐的体积增量仅略有不同。系统间伐的蓄积生长量最低。在系统间伐中，总产量（m3 ha - 1）随廊道宽度的增加而有所下降.在半系统间伐，另一方面，总产量是不明显相关的廊道宽度。廊道的存在加速了边木的直径增长。边缘效应随着深入带状物而逐渐减弱，并在距离走廊边缘约3 - 4 m处结束。间伐后，树高生长量先下降，后恢复。未间伐样地的死木数高于其他处理，但其他处理间差异不显著。可以得出结论，在北欧国家流行的间伐方法，即半系统间伐，最有可能导致没有显着的增长和产量损失。
Summary Diameter, height and volume increment of Scots pine ( Pinus sylvestris L.) and Norway spruce ( Picea abies (L.) Karst.) stands were investigated in long-term thinning experiments in southern Finland. The measurement period was on average 19 years, and thinnings consisted of fi ve different treatments: (1) unthinned; (2) selective thinning from below where thinning intensity was determined according to the number of stems; (3) selective thinning from below where thinning intensity was determined according to stand basal area; (4) systematic thinning where corridors were opened at regular intervals in the stand; and (5) half-systematic thinning where corridors were opened at regular intervals and the remaining strips thinned from below, i.e. a combination of selective and systematic thinning. The selective (basal area) thinning of Scots pine resulted in a volume growth reduction of about 12 per cent, but in Norway spruce it resulted in no marked reduction compared with the unthinned plots. In both tree species, volume increment in the half-systematic and selective (basal area) thinning differed only slightly from each other. The systematic thinning resulted in the lowest volume increment. In the systematic thinning, the total yield (m 3 ha - 1 ) somewhat decreased with increasing corridor width. In half-systematic thinning, on the other hand, the total yield was not clearly related to corridor width. A corridor accelerated the diameter increment of the edge trees. The edge effect progressively diminished when moving deeper into the strip and ended at a distance of about 3 – 4 m from the corridor edge. After the thinning, the height increment fi rst decreased, but later on it recovered. The unthinned plots had more dead trees than the other treatments, but there were no signifi cant differences between the other treatments. It can be concluded that the prevailing thinning method in the Nordic countries, i.e. half-systematic thinning, most probably results in no signifi cant growth and yield losses.
影响因子：
1.9
作者：
EDWARDS, D;BERRY, JJ
通讯作者：
BERRY, JJ