Growth of regenerated tree seedlings associated with microclimatic change in a mature larch plantation after harvesting
Growth of regenerated tree seedlings associated with microclimatic change in a mature larch plantation after harvesting
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DOI：
10.1007/s11355-009-0070-y
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发表时间：
2009-07-01
影响因子：
2
通讯作者：
Sasa, K.
中科院分区：
文献类型：
--
作者：
Kitaoka, Satoshi;Watanabe, M.;Sasa, K.
为了进一步发展森林可持续经营的方法，我们评估了冬季采伐对日本北部落叶松人工林4种阔叶树幼苗再生的小气候因子和生长的影响。研究发现，冬季采伐活动显著改变了小气候因子，尤其是光照强度和CO2浓度垂直分布格局。采伐落叶松增加了林下植物的光合光子通量（PPF），从而增强了林下植物的光合作用。本文研究了以下树种的树苗林下生长情况：晚演替种Prunus ssiori和Carpinus cordata；一个间隙期种，木兰；和一个中后期演替种，蒙古栎变种。所有四种被研究的树种在采伐落叶松第二年之后对冬季采伐的做法都有良好的反应。当前茎直径和当前茎长显著增加。因此，我们认为冬季采伐可以通过改变落叶松采伐过程中环境因子的变化来促进落叶松人工林落叶阔叶树更新苗的生长。
In order to further develop methods of sustainable forest management, we evaluated the effects of logging practices during the winter on microclimatic factors and growth of four seral deciduous broad-leaved tree seedlings regenerated in a larch plantation in northern Japan. We found that winter logging practices drastically changed microclimatic factors, especially in terms of light intensity and the vertical distribution pattern of CO2 concentration. Harvesting overstory larch trees increased photosynthetic photon flux (PPF), which may enhance the photosynthesis of understory plants. We examined the undergrowth for tree seedlings of the following species: two late successional species, Prunus ssiori and Carpinus cordata; one gap phase species, Magnolia hyporeuca; and one mid-late successional species, Quercus mongolica var. crispula. All of the four studied tree species responded well to the practices of winter logging after the second year of harvesting overstoried larch trees. The current shoot diameter and current shoot length increased significantly. Therefore, we conclude that winter logging practices should improve shoot growth of deciduous broad-leaved tree seedlings regenerated in a larch plantation through the change in environmental factors that accompanies larch harvest.