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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Decadal-scale changes in suspended wood after riparian recruitment in managed stands in headwater streams of coastal British Columbia, Canada
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Decadal-scale changes in suspended wood after riparian recruitment in managed stands in headwater streams of coastal British Columbia, Canada

机译：在加拿大沿海不列颠哥伦比亚省沿海岸边的河流招聘后悬浮木材招聘后的悬浮木头

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摘要

Large wood (LW) affects several ecological and hydrogeomorphic processes in streams. The main source of LW is riparian trees falling inside channels. However, in confined valley floors, falling trees are more likely to be suspended above the channel. Eventually, these suspended trees will decompose and break to finally fall into the channel to better provide functions for streams. We evaluated changes in wood decay, length, diameter, and suspended status (suspended or non-suspended) 17 years post-harvest and nine years after the first sampling occurred in 2006 in 12 headwater streams of coastal British Columbia, Canada. We also evaluated whether changes differed among riparian management treatments (no-harvest buffers of 10 and 30 m in width, thinning, and unharvested reference sites), and identified the factors affecting wood changes and suspended status. Wood pieces advanced in decay, became shorter, and 34% of them (n = 108) changed status from suspended to non-suspended. Non-suspended wood pieces were more decayed and shorter than suspended wood. Suspended wood was longer, thicker, less decayed, and represented 46.5% (n = 147) of the wood sampled in 2006. Our findings revealed limited influences of riparian management on many aspects of wood changes considered in this study. Changes in wood characteristics were more likely for pieces that were smaller in diameter, longer, and suspended closer to the water. The transition from suspended to non-suspended LW can be a long-term process that can increase wood residence time and reduce LW in-stream functions particularly in confined stream valleys. The suspended stage is also an important mechanism underlying time lags in stream ecosystem responses to riparian tree fall. (c) 2020 John Wiley & Sons, Ltd.
机译：大型木材（LW）影响溪流中的几种生态和水力晶形过程。 LW的主要来源是落在频道内的河岸树。然而，在狭窄的山谷地板中，落的树木更有可能悬挂在通道上方。最终，这些悬浮树将分解并断开最终落入通道以更好地为流提供函数。我们评估了在收获后17年的木材衰变，长度，直径和暂停状态（暂停或不暂停）的变化，并在2006年在加拿大的12个沿海哥伦比亚沿岸的沿海流程中发生了九年后九年。我们还评估了河岸管理治疗中的变化是否有所不同（宽度，稀疏，减薄和未收获的参考点10和30米的无收获缓冲液），并确定影响木材变化和暂停状态的因素。木材在衰变中提出，变短，34％（n = 108）改变了暂停的状态。不悬挂的木块更腐蚀，而不是悬浮木材。悬浮木材较长，较厚，较少衰退，并在2006年取样的木材所代表46.5％（n = 147）。我们的研究结果揭示了河岸管理对本研究中考虑的木材变化的许多方面的影响有限。木材特性的变化更可能是直径，较长的碎片，更长，悬挂在水中。从悬浮到非悬浮的LW的过渡可以是长期过程，可以增加木材停留时间，并特别是在密闭的流谷中减少LW流中的功能。暂停的阶段也是河岸生态系统反应中的时间滞后的重要机制。 （c）2020 John Wiley＆Sons，Ltd。

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