Finnish Forest Research Institute, FI-01301 Vantaa, Finland.
Tree Physiol. 2010 Jan;30(1):78-88. doi: 10.1093/treephys/tpp097. Epub 2009 Nov 24.
The aim of this study was to compare how conventional stem harvesting (CH) and whole-tree harvesting (WTH) in the first, and in some cases also in the second, thinning affect the needle nutrient status of Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) Karst.) stands in Finland. A series of 12 long-term field experiments was studied. The experiments were established during 1978-86. The effects of logging residue removal after thinnings on the needle nutrient concentrations were generally minor and without any overall trends, but there were differences between experiments. Trees tend to maintain their current needle nutrient concentrations at the same level by re-utilizing the nutrients stored in the older tissues and by changing C allocation in the whole tree. Thus, needle analysis should be combined with stem growth data in order to achieve a more comprehensive understanding of the effects of WTH on the nutrient status of trees.
本研究旨在比较传统的伐桩清理（CH）和全树砍伐（WTH）在第一次间伐以及在某些情况下第二次间伐时对芬兰云杉（Pinus sylvestris L.）和挪威云杉（Picea abies（L.）Karst.）林分的针叶养分状况的影响。对一系列 12 个长期野外试验进行了研究。这些试验是在 1978-86 年期间建立的。间伐后清除采伐剩余物对针叶养分浓度的影响通常较小，没有总体趋势，但不同试验之间存在差异。树木通过重新利用储存在较老组织中的养分和改变整棵树的 C 分配，倾向于将当前的针叶养分浓度维持在同一水平。因此，为了更全面地了解 WTH 对树木养分状况的影响，应该将针叶分析与树干生长数据相结合。
