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首页> 外文期刊>The Forestry Chronicle >Light dynamics and free-to-grow standards in aspen-dominated mixedwood forests
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Light dynamics and free-to-grow standards in aspen-dominated mixedwood forests

机译：在以杨木为主的混材林中的光动力学和自由生长标准

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摘要

This study examines light competition between aspen and spruce during the sequence of aspen development. Leaf area index and light transmission were measured or estimated for aspen stands from 2 to 125 years old. Light transmission was lowest at 15-25 years, and in some stands, transmission was less than 5% of above-canopy light. Hypothetical aspen stands with various stem configurations and heights were developed, and positions were identified that would meet or fail Alberta free-to-grow (FTG) standards. Light transmission was estimated at each position with the MIXLIGHT forest light simulator. Positions in canopy gaps or at the northern sides of canopy gaps had higher light. In general, however, there was little difference in available light between positions that met or failed FTG criteria. Stand density and size of aspen trees appears to be a better index to predict light transmission and spruce success in juvenile aspen stands than current FTG criteria.
机译：本研究探讨了白杨发育过程中白杨与云杉之间的轻度竞争。测量或估计2至125年的白杨林的叶面积指数和透光率。透光率最低，为15-25岁，在某些林分中，透光率不到树冠上方光的5％。开发了具有各种茎杆构造和高度的假想白杨木立场，并确定了符合或不符合艾伯塔省自由生长（FTG）标准的位置。使用MIXLIGHT森林光线模拟器估算了每个位置的透光率。在树冠间隙或树冠间隙北侧的位置具有较高的光线。但是，一般而言，满足或不满足FTG标准的位置之间的可用光几乎没有差异。与当前的FTG标准相比，林分密度和白杨树的大小似乎是预测幼树白杨林的透光率和云杉成功率的更好指标。

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