Canopy space filling rather than conventional measures of structural diversity explains productivity of beech stands
Canopy space filling rather than conventional measures of structural diversity explains productivity of beech stands
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DOI：
10.1016/j.foreco.2017.03.036
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发表时间：
2017-07-01
影响因子：
3.7
通讯作者：
Seidel, Dominik
中科院分区：
文献类型：
--
作者：
Juchheim, Julia;Ammer, Christian;Seidel, Dominik
在实现其他管理目标中，造林的成功在很大程度上取决于对林分密度和由此产生的林分生长反应之间关系的了解，然而，在时间不起作用的情况下，造林间伐是否可以提高木材产量，还是在未管理的林分中达到最大产量，仍然存在争议。此外，对于结构多样性是促进还是降低生产率，也没有普遍的答案。在本研究中，我们采用地面激光扫描（TLS）调查三维空间填充，森林经营强度，生产力和结构多样性的常规措施之间的关系。我们研究了35个山毛榉为主的林地沿着梯度的管理强度在三个地区的德国。我们发现，空间填充在开叶条件下增加管理强度，特别是在遮荫冠。增加空间填充的阴影冠，由于树木的去除也导致了更高的林分生产力。我们的结论是，增加空间填充在遮荫的欧洲山毛榉林分负责补偿生产损失的上层冠层由于间伐活动。结构多样性的常规措施是不敏感的应用造林活动。我们还发现，传统的措施和林分生产力所描述的结构多样性之间没有关系。(C)2017爱思唯尔B.V.保留所有权利。
Silvicultural success in achieving, among other management goals, maximum productivity strongly depends on knowledge of the relationship between stand density and the resulting growth response of a stand. However, there are still controversial discussions whether wood production can be enhanced by silvicultural thinning or reaches its maximum in unmanaged forest stands if time plays no role. Moreover there is no universal answer whether structural diversity promotes or reduces productivity. In the present study we applied terrestrial laser scanning (TLS) to investigate the relationship between three-dimensional space filling, forest management intensity, productivity and conventional measures of structural diversity. We examined 35 beech-dominated forest plots along a gradient of management intensity in three regions of Germany. We found that space filling in leaf-on condition increased with management intensity, particularly in the shaded crown. Increased space filling in the shaded crown due to tree removals also resulted in higher stand productivity. We conclude that an increased space filling in the shaded canopy of managed European beech stands is responsible for the compensation of production losses in the upper canopy due to thinning activities. Conventional measures of structural diversity were not sensitive to the applied silvicultural activities. We also found no relationship between structural diversity described by conventional measures and stand productivity. (C) 2017 Elsevier B.V. All rights reserved.