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Structural change during transformation in the Glentress Trial - an update

机译：Glentress试用版转换过程中的结构变化-更新

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The Glentress Trial Area, established in 1952, is a long term experiment of the transformation of even-aged plantations to continuous cover management in upland, coniferous forest. This paper examines the structure of the Trial Area in 2008 and changes since 1990. The stem diameter distributions for each of six trial Blocks (-20 ha each) continue to have a 'reverse-J' shape and this study confirms, for the first time, that this is also the case at much smaller spatial scales. There has only been a small increase in basal area between 1990 and 2008 indicating that thinning and growth are in balance. However, despite few changes in basal area there has been a decrease in the number of trees. The main reason for the reduction in the number of trees isthat in four of the six Blocks there is insufficient recruitment of saplings into trees to sustain the 'reverse-J' structures. It is also clear that Sitka spruce is increasingly dominant in the canopy, saplings and seedlings in the Trial. The results ofthis analysis of structural change have been addressed in a new management plan.
机译：Glentress试验区成立于1952年，是一项长期试验，目的是将高龄针叶林转变为对针叶林高地持续覆盖的管理。本文研究了2008年试验区的结构以及1990年以来的变化。六个试验区（每个20公顷）中每个区的茎径分布都继续呈“反J”形，这项研究首次证实了这一点。时间，在较小的空间尺度上也是如此。在1990年至2008年期间，基础面积仅小幅增加，表明间伐和增长处于平衡状态。然而，尽管基础面积变化不大，树木数量却有所减少。减少树木数量的主要原因是，在六个街区中的四个街区中，没有足够的树苗招募来维持“反向J型”结构。同样清楚的是，在试验中，锡特卡云杉在树冠，幼树和幼苗中越来越占主导地位。在新的管理计划中已解决了结构变化分析的结果。

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