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Large wood load fluctuations in an Andean basin
Earth Surface Processes and Landforms ( IF 2.8 ) Pub Date : 2020-11-03 , DOI: 10.1002/esp.5030 Lorenzo Picco 1, 2, 3 , Cordelia Scalari 1 , Andrés Iroumé 3, 4 , Bruno Mazzorana 3, 5 , Andrea Andreoli 6
Earth Surface Processes and Landforms ( IF 2.8 ) Pub Date : 2020-11-03 , DOI: 10.1002/esp.5030 Lorenzo Picco 1, 2, 3 , Cordelia Scalari 1 , Andrés Iroumé 3, 4 , Bruno Mazzorana 3, 5 , Andrea Andreoli 6
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The importance of monitoring and analysing wood fluxes in mountain environments is widely recognized. However, there is a lack of information related to the long‐term fluctuations in wood load and associated to the changes in large wood (LW) characteristics. The main aims of the research were to analyse (i) changes in wood characteristics, (ii) fluctuations in wood load, and (iii) the relationship between wood load and sub‐reach settings, proposing an ad hoc roughness index (RI). Repeated field surveys to measure wood load and LW characteristics during a 13‐year period were conducted within a 2.2 km‐long reach of the Rio Toro (Chile), which flows through the Malleco Forest National Reserve that was affected by wildfires in 2002 and 2015. Two spatial scales (i.e. study reach and sub‐reach) were considered. Irrespective of the adopted scale wood load fluctuated considerably, in both number and volume, with significant changes in LW characteristics (i.e. mean diameter and length). Moreover, a clear tendency to the aggregation in wood jams (WJs) was observed within the entire study reach. Based on our results, we conclude that 17 years after the first wildfire wood recruitment has started in the upper parts of the basin. Moreover, Generalized Linear Mixed Models (GLMM) analyses were carried out to investigate the relationship between RI and both number and volume of LW. Both models are characterized by high adjusted R2 of 74.9% and 72.8% for volume and number, respectively. This demonstrated that the RI can characterize the reaches in terms of tendency to deposition and trapping of wood. These results are promising, particularly in improving the knowledge related to potential deposition areas that can control wood load fluctuations, also permitting its management to be improved. © 2020 John Wiley & Sons, Ltd.
中文翻译：
安第斯盆地的木材负荷波动较大
在山区环境中监视和分析木材通量的重要性已得到广泛认可。但是，缺乏有关木材负荷的长期波动以及大木材（LW）特性变化的信息。该研究的主要目的是分析（i）木材特性的变化，（ii）木材负荷的波动，以及（iii）木材负荷与次伸手环境之间的关系，提出了一个临时方案。粗糙度指数（RI）。在里奥托罗（智利）长达2.2公里的范围内，进行了重复的实地调查，以测量13年期间的木材负荷和轻木特性，该河流经受2002年和2015年野火影响的马雷科森林国家保护区。考虑了两个空间尺度（即研究范围和子范围）。不管采用何种规模，木材的负载在数量和体积上都存在很大波动，其轻量化特性（即平均直径和长度）发生了显着变化。此外，在整个研究范围内都观察到了明显的积木趋势。根据我们的结果，我们得出结论，在盆地上部开始第一次野火采伐17年之后。而且，进行了广义线性混合模型（GLMM）分析以研究RI与LW的数量和体积之间的关系。两种型号均具有高调节性数量和数量的R 2分别为74.9％和72.8％。这表明RI可以根据木材的沉积和捕获趋势来表征河段。这些结果令人鼓舞，特别是在改善与可能控制木材负荷波动的潜在沉积区域有关的知识方面，也使木材的管理得以改善。分级为4 +©2020 John Wiley＆Sons，Ltd.
更新日期：2020-11-03
中文翻译：
安第斯盆地的木材负荷波动较大
在山区环境中监视和分析木材通量的重要性已得到广泛认可。但是，缺乏有关木材负荷的长期波动以及大木材（LW）特性变化的信息。该研究的主要目的是分析（i）木材特性的变化，（ii）木材负荷的波动，以及（iii）木材负荷与次伸手环境之间的关系，提出了一个临时方案。粗糙度指数（RI）。在里奥托罗（智利）长达2.2公里的范围内，进行了重复的实地调查，以测量13年期间的木材负荷和轻木特性，该河流经受2002年和2015年野火影响的马雷科森林国家保护区。考虑了两个空间尺度（即研究范围和子范围）。不管采用何种规模，木材的负载在数量和体积上都存在很大波动，其轻量化特性（即平均直径和长度）发生了显着变化。此外，在整个研究范围内都观察到了明显的积木趋势。根据我们的结果，我们得出结论，在盆地上部开始第一次野火采伐17年之后。而且，进行了广义线性混合模型（GLMM）分析以研究RI与LW的数量和体积之间的关系。两种型号均具有高调节性数量和数量的R 2分别为74.9％和72.8％。这表明RI可以根据木材的沉积和捕获趋势来表征河段。这些结果令人鼓舞，特别是在改善与可能控制木材负荷波动的潜在沉积区域有关的知识方面，也使木材的管理得以改善。分级为4 +©2020 John Wiley＆Sons，Ltd.
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