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首页> 外文期刊>Nature >DISTRIBUTION OF BEDROCK AND ALLUVIAL CHANNELS IN FORESTED MOUNTAIN DRAINAGE BASINS
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DISTRIBUTION OF BEDROCK AND ALLUVIAL CHANNELS IN FORESTED MOUNTAIN DRAINAGE BASINS

机译：森林流域盆地基岩和冲积通道的分布。

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摘要

MOUNTAIN river networks often consist of both bedrock and alluvial channel(1-5), the spatial distribution of which controls several fundamental geomorphological and ecological processes(6,7). The nature of river channels can influence the rates of river incision and landscape evolution(1,2), as well as the stream habitat characteristics affecting species abundance and aquatic ecosystem structure(8-11), Studies of the factors controlling the distribution of bedrock and alluvial channels have hitherto been limited to anthropogenic badlands(12), Here we investigate the distribution of channel types in forested mountain drainage basins, and show that the occurrence of bedrock and alluvial channels can be described by a threshold model relating local sediment transport capacity to sediment supply. In addition, we find that valley-spanning log jams create alluvial channels-hospitable to aquatic life-in what would otherwise be bedrock reaches, The formation of such jams depends critically on the stabilizing presence of logs derived from the largest trees in the riverside forests, suggesting that management strategies that allow harvesting of such trees can have a devastating influence on alluvial habitats in mountain drainage basins. [References: 32]
机译：山地河网通常由基岩和冲积河道组成（1-5），其空间分布控制着几个基本的地貌和生态过程（6,7）。河道的性质可影响河道切开速度和景观演化（1,2），以及影响物种丰富度和水生生态系统结构的河流生境特征（8-11），控制基岩分布的因素的研究迄今为止，冲积河道仅限于人为荒地（12），在此我们调查了森林山区流域的河道类型分布，并表明基岩和冲积河道的发生可以通过与局部泥沙输送能力有关的阈值模型来描述。沉积物供应。此外，我们发现横跨山谷的原木堵塞会形成冲积通道，对水生生物来说是宜居的，否则将成为基岩。此类堵塞的形成关键取决于稳定在河边森林中最大树木的原木的存在，表明允许采伐此类树木的管理策略可能会对山区流域的冲积生境产生毁灭性影响。 [参考：32]

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