Movilidad y reclutamiento de material leñoso de gran tamaño en dos cauces de la Cordillera de la Costa de Chile

Iroumé, Andrés; Ulloa, Héctor; Lenzi, Mario Aristide; Andreoli, Andrea; Gallo, Carolina

doi:10.4067/s0717-92002011000300006

Cited by 12 publications

(7 citation statements)

References 20 publications

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“…(2008), Gallo (2009), Iroumé et al . (2010, 2011, 2014, 2015, 2017, 2018), and Ulloa et al . (2011).…”

Section: Methodsmentioning

confidence: 93%

“…LW data were collected on 11 field surveys over a period of 10 years in channel segments of the Pichún and Vuelta de Zorra low‐order streams located in the coastal mountain range in Southern Chile. Data from these streams have supported research related to the abundance of LW pieces, dimensions (diameter, length, volume), aggregation, position in the channel, orientation to flow, longitudinal distribution and breakdown, wood load, and dynamics at reach and segment scales (Iroumé et al ., 2010, 2011, 2014, 2015, 2017, 2018; Ulloa et al ., 2011). Herein, we extend the existing database to include information obtained between the first (November–December 2008) and last field surveys (summer months from the end of 2018 to early 2019) (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Long‐term large wood load fluctuations in two low‐order streams in Southern Chile

Iroumé

Cartagena

Villablanca

et al. 2020

Earth Surf Processes Landf

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The eco‐hydrogeomorphic significance of large wood (LW) and its potential for increasing downstream hazards during extreme floods have been widely recognized. We used LW data collected for a 10‐year period from the two low‐order streams of Pichún (Pi) and Vuelta de Zorra (VZ) in Southern Chile to (a) determine if the abundance and dimensions of individual LW pieces change with time, (b) quantify wood load fluctuations during the 10‐year period, and (c) assess the role of LW recruitment from the riparian forests to explain wood load fluctuations during the study period. Nine years after the first survey, the number of LW pieces in Pi and VZ diminished by 60 and 40%, respectively. Despite the reduction in these numbers, in Pi, the LW dimensions did not change significantly during the study. In VZ, the dimensions exhibited statistically significant differences, despite being within the same class. In both catchments, the LW load fluctuated during a 10‐year period, but the drivers of change differed. Although tree toppling was the recruitment mechanism responsible for LW in both stream cases, the high wood load measured in Pi at the beginning of the study suggested massive tree recruitments before the first survey, followed by wood exports which were higher than inputs in the subsequent 10‐year period. In VZ, LW load decreased during the first 9 years (mean annual rate of ~9.2 m3 year−1) and then increased by ~12.1 m3 year−1 in year 10. At VZ, the inputs consisted of single trees that were recruited from the riparian area and by upstream flotation, while exports occurred by downstream fluvial transport. Wood inputs and exports occurred asynchronously and led to LW load fluctuations at decadal and annual intervals. Land management and tree species thus exert a major influence on wood inventory and budget in streams. © 2020 John Wiley & Sons, Ltd.

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“…(2008), Gallo (2009), Iroumé et al . (2010, 2011, 2014, 2015, 2017, 2018), and Ulloa et al . (2011).…”

Section: Methodsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Long‐term large wood load fluctuations in two low‐order streams in Southern Chile

Iroumé

Cartagena

Villablanca

et al. 2020

Earth Surf Processes Landf

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“…As mentioned earlier, the 1557m channel segment has been surveyed since the end-2008 to study LW abundance, mobility and breakage (see Iroumé et al, 2010Iroumé et al, , 2011Iroumé et al, , 2014Iroumé et al, , 2015Iroumé et al, , 2017Iroumé et al, , 2018Ulloa et al, 2011). During the first survey, 71% of the LW pieces found in the channel were tagged with numbered metal plates and then after each rainy winter period between the years 2009 and 2018, the segment was re-surveyed and all new LW recruited from bank erosion or toppling was measured, tagged, and positioned.…”

Section: Comparison Of Cpom and Lw Exportsmentioning

confidence: 99%

“…A 1557 m‐long channel segment (Figure 1b) has been repeatedly surveyed since the end of 2008 and the collected data has supported several studies of LW abundance, mobility, and breakage (see Iroumé et al ., 2010, 2011, 2014, 2015, 2017, 2018; Ulloa et al ., 2011.…”

Section: Study Areamentioning

confidence: 99%

Fluvial transport of coarse particulate organic matter in a coastal mountain stream of a rainy‐temperate evergreen broadleaf forest in southern Chile

Iroumé

Ruíz-Villanueva

Salas‐Coliboro

2020

Earth Surf Processes Landf

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Coarse particulate organic matter (CPOM, i.e. particles such as leaves, wood fragments, twigs, branches, flowers, seeds and fruits) in aquatic systems influences the flow, provides an important food source, and at the catchment scale, may significantly contribute to total carbon export. CPOM exports have rarely been quantified in subtropical, broadleaf forest streams. We captured CPOM in Bunte traps in the rainfall-dominated Vuelta de Zorra stream in southern Chile to (a) propose a novel classification to characterize the different CPOM components, (b) analyze the frequency of each matter class (i.e. leaves, wood fragments, and 'others') and its seasonal variability, (c) quantify the CPOM transported, (d) derive a model to quantify CPOM transport rates, and (e) compare the transported CPOM data with those from a unique long-term (> sevenyears) large wood monitoring dataset. Results showed that leaves were significantly more abundant than other types of CPOM in all seasons. The dry CPOM transport rate ranged over three orders of magnitude, and there was a significant relationship with mean discharge. Mean dry CPOM yield for the study period 2015-2017 was 4.6kg/ha/yr when normalizing to the total forested catchment area. The 2009-2018 decadal average yield was 6.8kg/ha/yr when normalizing to the total forested catchment area. These values are similar to measurements from deciduous and coniferous forests in streams in the United States and the Brazilian Mato Grosso and~1/10 of the yields obtained in a Swiss torrent. Over a three-year period, the CPOM exports in Vuelta de Zorra ranged between 13 and 36% of the exported large wood (particles with diameters ≥ 100mm and length ≥ 1m) exports. Our data collected from an underrepresented area improve the understanding of global carbon budgets and cycling.

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“…Large wood is supplied into the main channel only from the riparian area (some native but mainly P. radiata trees from the previous rotations) through natural mortality, windthrowing or bank erosions. Further details on this site can be found in [10] and [11]. El Toro (38˚09'11''S; 71˚48'12''W) is located on the Andes range.…”

mentioning

confidence: 99%

Large Wood Volume and Longitudinal Distribution in Channel Segments Draining Catchments with Different Land Use, Chile

Iroumé¹,

Mao²,

Ulloa³

et al. 2014

OJMH

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The storage, longitudinal distribution and recruitment processes of in-stream large wood (LW) were studied comparing channel segments draining four Chilean mountain catchments with different land use. The segments were divided into relatively uniform reaches of different lengths and surveyed for LW (piece dimensions, position in the channel, orientation to flow and aggregation) and stream morphology (slope and bank full channel width and depth) characterizations. LW volume stored in the Pichun, El Toro and Vuelta de Zorra study channels are within the range informed in international researches from streams draining catchments with similar forest covers. However, the 1057 m 3 /ha of LW stored in Tres Arroyos is extremely high and in the same order of magnitude than the reports from old-growth forests in the Pacific Northwest of USA. The size of the area that can potentially provide wood to streams depends on the wood supply mechanisms within any catchment, and the LW stored in the study segments increases as the size of this area increases. This study aims to contribute to the knowledge on the effects of LW in mountain channels, gathering new information and expanding investigations developed in Chile since 2008. This research was carried out within the framework of Project FONDECYT 11106209.

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Movilidad y reclutamiento de material leñoso de gran tamaño en dos cauces de la Cordillera de la Costa de Chile

Cited by 12 publications

References 20 publications

Long‐term large wood load fluctuations in two low‐order streams in Southern Chile

Long‐term large wood load fluctuations in two low‐order streams in Southern Chile

Fluvial transport of coarse particulate organic matter in a coastal mountain stream of a rainy‐temperate evergreen broadleaf forest in southern Chile

Large Wood Volume and Longitudinal Distribution in Channel Segments Draining Catchments with Different Land Use, Chile

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