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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Effects of forest stand age on the characteristics of logjams in mountainous forest streams
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Effects of forest stand age on the characteristics of logjams in mountainous forest streams

机译：林分年龄对山区森林溪流阻塞特征的影响

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We measured longitudinal spacing and wood volume of channel-spanning logjams along 30 1-km reaches of forest streams in the Colorado Front Range, USA. Study streams flow through old-growth (> 200 year stand age) or younger subalpine conifer forest. Evaluating correlations between the volume and longitudinal spacing of logjams in relation to channel and forest characteristics, we find that old-growth forest streams have greater in-stream wood loads and more jams per kilometer than streams in younger forest. Old-growth forests have a larger basal area close to the stream and correlate with larger piece diameters of instream wood. Jam volume correlates inversely with the downstream spacing for ramp and bridge pieces that can act as key pieces in jams. Most importantly, old-growth streams have shorter downstream spacing for ramp and bridge pieces (< 20 m). Our results suggest that management of in-stream wood and associated stream characteristics can be focused most effectively at the reach scale, with an emphasis on preserving old-growth riparian stands along lower gradient stream reaches or mimicking the effects of old growth by manipulating the spacing of ramp and bridge pieces. Our finding that average downstream spacing between jams declines as wood load increases suggests that the most effective way to create and retain jams is to ensure abundant sources of wood recruitment, with a particular emphasis on larger pieces that are less mobile because they have at least one anchor point outside the active channel.
机译：我们在美国科罗拉多州前山脉的30条1公里长的森林溪流中测量了横跨河道的堵塞物的纵向间距和木材体积。研究流流经较老的（> 200岁树龄）或更年轻的亚高山针叶林。通过评估原木的体积和纵向间距与河道和森林特征之间的相关性，我们发现与较年轻的森林相比，生长较早的森林溪流具有更大的溪流木材负荷和每公里更多的果酱。原始森林在靠近溪流的地方有较大的基础面积，并且与溪流木材的较大直径相关。卡纸量与可以用作卡纸关键部件的坡道和桥形件的下游间距成反比。最重要的是，对于坡道和桥段（<20 m），旧增长流的下游间距更短。我们的结果表明，溪流木材和相关溪流特征的管理可以最有效地集中在河段规模，重点在于沿较低坡度河溪流段保留旧的河岸林分，或通过控制间距来模仿旧的生长的影响。和桥梁的碎片。我们的发现表明，果酱之间的平均下游间距随着木材负荷的增加而减小，这表明，制造和保留果酱的最有效方法是确保大量木材采伐，尤其要注意那些活动性较小的大块木材，因为它们至少有一个活动通道外的锚点。

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