Logging Disturbance, Hydrology, and Landscape Features Determine Suspended Fine Particulate Organic Matter Concentrations in Forested Headwater Streams: A 10-Year Forest Management Experiment DOI
Peter M. Kiffney, John S. Richardson,

M. Feller

et al.

Published: Jan. 1, 2023

Headwater streams are important sources of water and materials supporting food webs in downstream habitats, considered sensitive to forest disturbance. We manipulated 13 headwater draining ~70 year-old coniferous-dominated forests near Vancouver, Canada investigate the effects logging on suspended fine particulate organic matter (FPOM: > 0.50 μm < 1.0 mm) concentrations. FPOM is a predominant source for invertebrates serves as longitudinal link river webs. Riparian treatments (n = 3 4 replicates/treatment) represented gradient disturbance intensity including clear-cut stream edge (high disturbance), 10-m 30-m wide forested buffers, controls (natural levels). Suspended was collected during discrete events (FPOMD, mg·L-1·km-2) before (1997–1998) after (1998–2007) timber harvest continuously (FPOMC) storm first three years logging. The log-response ratio, which measured proportionate change FPOMD relative logging, declined all However, rate decline almost two times faster buffer other treatments. Furthermore, FPOMC concentrations increased at rates with unit increase discharge hypothesized that due variety interdependent factors lower inputs higher loss rates. In addition FPOM, we found concentration modified by natural hydrologic landscape variability, channel gradient.

Language: Английский

Accelerated Organic Carbon Burial Rates Reconstructed in Elephant Butte Reservoir, New Mexico During a Megadrought DOI Creative Commons
A. C. Eckland, Irina Overeem, Brandee Carlson

et al.

Water Resources Research, Journal Year: 2025, Volume and Issue: 61(3)

Published: Feb. 28, 2025

Abstract Artificial lakes (reservoirs) accumulate sediment and organic carbon (OC) over time. We investigated sedimentation processes in a dryland reservoir informed OC burial potential preservation. Our study site, Elephant Butte Reservoir on the Rio Grande, New Mexico, USA receives inflows from sediment‐laden, monsoon‐driven flash floods. Using field data, historical survey river flux (water, sediment, OC) we estimated volumes rates within delta, bottom, whole during wet (1980–1988) dry (2007–2017/2019) climate periods. During severe drought (2021–2022), measured suspended concentrations for characteristic (seasonal) phases of hydrograph, monitored delta patterns, observed outflow plume dynamics. Measured (mean = 8,818 mg/l, median 1,769 mg/l) frequently surpassed hyperpycnal threshold (1,000 mg/l), especially floods (maximum 46,718 mg/l). River total content averaged 5.2% ± 12.2%, increasing to 6.3% 10.3% summer. Whole linear 3.1 1.4% (dry)–4.0 4.2% (wet) cm/yr, with higher bottom (5.0 0.3% cm/yr) than (0.8 1.1% deposition, potentially preserving OC. Comparisons suspension deposited indicate partial Estimated is conditions (391 43.6% vs. 82.4 56.4% g C/m 2 yr), suggesting that reservoirs may be efficient sinks these

Language: Английский

Citations

0
Current progress in quantifying and monitoring instream large wood supply and transfer in rivers DOI
Virginia Ruíz‐Villanueva, Janbert Aarnink, Hossein Ghaffarian

et al.

Earth Surface Processes and Landforms, Journal Year: 2024, Volume and Issue: 49(1), P. 256 - 276

Published: Jan. 1, 2024

Abstract Large wood drives both the form and function of gravel‐bed rivers draining forested basins. Previously overlooked benefits in are now widely recognized. Together with flow sediment regimes, regime controls rivers' physical ecological integrity. Yet large quantities transported during floods can pose additional hazards, potentially damaging infrastructures like bridges or dams exacerbating flooding. However, unlike water regimes intensively studied over past decades, instream budgeting has been only recently defined thus is still rarely quantified. The budget describes cascading processes from supply recruitment, entrainment, transport to deposition, storage decay (i.e., fragmentation decomposition). These show high spatial temporal variability but be characterized by magnitude, frequency, timing, duration mode. Instream challenging, primarily because lack observations, monitoring stations, standardized protocols acquire data. This contribution reviews most recent advances quantify different components, notably supply, transfer. Case studies showing applications biogeochemistry, videography, artificial intelligence, numerical modelling tracking illustrate current progress. Because critical challenges remain, we identify describe some them discuss how riverine sciences may develop future.

Language: Английский

Citations

2
Comment on egusphere-2023-2485 DOI Creative Commons
J. Jotautas Baronas

Published: April 15, 2024

Abstract. Fluvial transport of organic carbon from the terrestrial biosphere to oceans is an important term in global cycle. Traditionally, long-term burial flux fluvial particulate (POC) estimated using river suspended sediment flux; however, can also travel bedload as coarse matter (POMBed). Estimates POC export ocean are highly uncertain because few studies document POMbed sources, and evolution during long-range uplands basins. This knowledge gap limits our ability determine flux. In this study we investigate flux, sources transformations POMBed over a ~1300 km long reach Rio Bermejo, Argentina, which has no tributary inputs. To constrain sourcing POMBed, analysed composition stable hydrogen isotope ratios (δ2H, δ13C) plant wax biomarkers at six locations along compared samples sediment, soil, leaf litter floating debris (POMfloat) both lowland headwater system. Across all samples, found discernible differences n-alkane average chain length or nC29 δ13C values, indicating common origin for sampled POMBed. Leaf POMfloat δ2H values decrease with elevation, making it useful proxy source elevation. Biomarker δ2H values suggest that mix distally-derived locally-recruited floodplain sampling locations. These results indicate be preserved through rivers hundreds kilometres. However, decreases increasing distance, suggesting mechanical comminution these particles, progressive transfer into load. Our provisional estimates comprises less than 1 percent load Bermejo. While represents small portion high density material likely higher probability deposition sedimentary basins, potentially allowing more effective CO2 drawdown relative fine particles. Because rate ratio versus varies across tectonic climatic settings, additional research needed importance

Language: Английский

Citations

0
Comment on egusphere-2023-2485 DOI Creative Commons

Kasey Clark

Published: May 5, 2024

Abstract. Fluvial transport of organic carbon from the terrestrial biosphere to oceans is an important term in global cycle. Traditionally, long-term burial flux fluvial particulate (POC) estimated using river suspended sediment flux; however, can also travel bedload as coarse matter (POMBed). Estimates POC export ocean are highly uncertain because few studies document POMbed sources, and evolution during long-range uplands basins. This knowledge gap limits our ability determine flux. In this study we investigate flux, sources transformations POMBed over a ~1300 km long reach Rio Bermejo, Argentina, which has no tributary inputs. To constrain sourcing POMBed, analysed composition stable hydrogen isotope ratios (δ2H, δ13C) plant wax biomarkers at six locations along compared samples sediment, soil, leaf litter floating debris (POMfloat) both lowland headwater system. Across all samples, found discernible differences n-alkane average chain length or nC29 δ13C values, indicating common origin for sampled POMBed. Leaf POMfloat δ2H values decrease with elevation, making it useful proxy source elevation. Biomarker δ2H values suggest that mix distally-derived locally-recruited floodplain sampling locations. These results indicate be preserved through rivers hundreds kilometres. However, decreases increasing distance, suggesting mechanical comminution these particles, progressive transfer into load. Our provisional estimates comprises less than 1 percent load Bermejo. While represents small portion high density material likely higher probability deposition sedimentary basins, potentially allowing more effective CO2 drawdown relative fine particles. Because rate ratio versus varies across tectonic climatic settings, additional research needed importance

Language: Английский

Citations

0
Comment on egusphere-2023-2485 DOI Creative Commons

Sophia Dosch

Published: June 2, 2024

Abstract. Fluvial transport of organic carbon from the terrestrial biosphere to oceans is an important term in global cycle. Traditionally, long-term burial flux fluvial particulate (POC) estimated using river suspended sediment flux; however, can also travel bedload as coarse matter (POMBed). Estimates POC export ocean are highly uncertain because few studies document POMbed sources, and evolution during long-range uplands basins. This knowledge gap limits our ability determine flux. In this study we investigate flux, sources transformations POMBed over a ~1300 km long reach Rio Bermejo, Argentina, which has no tributary inputs. To constrain sourcing POMBed, analysed composition stable hydrogen isotope ratios (δ2H, δ13C) plant wax biomarkers at six locations along compared samples sediment, soil, leaf litter floating debris (POMfloat) both lowland headwater system. Across all samples, found discernible differences n-alkane average chain length or nC29 δ13C values, indicating common origin for sampled POMBed. Leaf POMfloat δ2H values decrease with elevation, making it useful proxy source elevation. Biomarker δ2H values suggest that mix distally-derived locally-recruited floodplain sampling locations. These results indicate be preserved through rivers hundreds kilometres. However, decreases increasing distance, suggesting mechanical comminution these particles, progressive transfer into load. Our provisional estimates comprises less than 1 percent load Bermejo. While represents small portion high density material likely higher probability deposition sedimentary basins, potentially allowing more effective CO2 drawdown relative fine particles. Because rate ratio versus varies across tectonic climatic settings, additional research needed importance

Language: Английский

Citations

0
Logging disturbance, hydrology, and geomorphic context determine suspended fine particulate organic matter concentrations in forested coastal headwater streams: A 10-year forest management experiment DOI
Peter M. Kiffney, John S. Richardson,

M. Feller

et al.

Forest Ecology and Management, Journal Year: 2024, Volume and Issue: 566, P. 122014 - 122014

Published: June 15, 2024

Language: Английский

Citations

0
The influence of large wood on sediment routing and flow characteristics: A study in a low-order stream in the southern brazilian plateau DOI
Bruno Henrique Abatti, Gean Paulo Michel, Ronald E. Poeppl

et al.

Geomorphology, Journal Year: 2024, Volume and Issue: 465, P. 109398 - 109398

Published: Aug. 25, 2024

Language: Английский

Citations

0
Sourcing and long-range transport of particulate organic matter in river bedload: Río Bermejo, Argentina DOI Creative Commons
Sophia Dosch, Niels Hovius, Marisa Repasch

et al.

Earth Surface Dynamics, Journal Year: 2024, Volume and Issue: 12(4), P. 907 - 927

Published: Aug. 19, 2024

Abstract. Fluvial transport of organic carbon from the terrestrial biosphere to oceans is an important term in global cycle. Traditionally, long-term burial flux fluvial particulate (POC) estimated using river suspended sediment flux; however, can also travel bedload as coarse matter (POMBed). Estimates POC export ocean are highly uncertain because few studies document POMbed sources, flux, and evolution during long-range uplands basins. This knowledge gap limits our ability determine flux. In this study we investigate transformations POMBed over a ∼1300 km long reach Río Bermejo, Argentina, which has no tributary inputs. To constrain sourcing POMBed, analyzed composition stable hydrogen isotope ratios (δ2H, δ13C) plant wax biomarkers at six locations along Bermejo compared samples sediment, soil, leaf litter, floating debris (POMfloat) both lowland headwater system. Across all samples, found discernible differences n-alkane average chain length or nC29 δ13C, indicting common origin for sampled POMBed. Leaf litter POMfloat δ2H values decrease with elevation, making it useful proxy source elevation. Biomarker suggest that mix distally derived locally recruited floodplain sources sampling locations. These results indicate be preserved through rivers hundreds kilometers. However, decreases increasing distance, suggesting mechanical comminution these particles progressive transfer into load. Our provisional estimates comprises less than 1 % load Bermejo. While represents small portion coarse, high-density material likely higher probability deposition sedimentary basins, potentially allowing more effective CO2 drawdown relative fine particles. Because rate ratio versus vary across tectonic climatic settings, additional research needed importance

Language: Английский

Citations

0
Logging Disturbance, Hydrology, and Landscape Features Determine Suspended Fine Particulate Organic Matter Concentrations in Forested Headwater Streams: A 10-Year Forest Management Experiment DOI
Peter M. Kiffney, John S. Richardson,

M. Feller

et al.

Published: Jan. 1, 2023

Headwater streams are important sources of water and materials supporting food webs in downstream habitats, considered sensitive to forest disturbance. We manipulated 13 headwater draining ~70 year-old coniferous-dominated forests near Vancouver, Canada investigate the effects logging on suspended fine particulate organic matter (FPOM: > 0.50 μm < 1.0 mm) concentrations. FPOM is a predominant source for invertebrates serves as longitudinal link river webs. Riparian treatments (n = 3 4 replicates/treatment) represented gradient disturbance intensity including clear-cut stream edge (high disturbance), 10-m 30-m wide forested buffers, controls (natural levels). Suspended was collected during discrete events (FPOMD, mg·L-1·km-2) before (1997–1998) after (1998–2007) timber harvest continuously (FPOMC) storm first three years logging. The log-response ratio, which measured proportionate change FPOMD relative logging, declined all However, rate decline almost two times faster buffer other treatments. Furthermore, FPOMC concentrations increased at rates with unit increase discharge hypothesized that due variety interdependent factors lower inputs higher loss rates. In addition FPOM, we found concentration modified by natural hydrologic landscape variability, channel gradient.

Language: Английский

Citations

0