Do southern Appalachian Mountain summer stream temperatures respond to removal of understory rhododendron thickets?

Raulerson, Scott; Jackson, C. Rhett; Melear, Nathan D.; Younger, Seth E.; Dudley, Maura P.; Elliott, Katherine J.

doi:10.1002/hyp.13788

Cited by 9 publications

(5 citation statements)

References 73 publications

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“…Webb and Crisp [11] showed that recovery of riparian vegetation and increases in shading after 4 years of coniferous plantation in the UK decreased monthly mean maximum stream temperature by 5 • C. In Indonesia, Carlson et al [12] reported that stream temperature increased up to 2.1 • C after the conversion of native forest to oil palm plantation because of changes in shading patterns along riparian zones. Removal of Rhododendron understory in a southern Appalachian catchment increased daily maximum stream temperature by up to 2.6 • C because of the increases in canopy gaps, although the treatment effect was variable among sites and years [13].…”

Section: Introductionmentioning

confidence: 99%

Stream Temperature Response to 50% Strip-Thinning in a Temperate Forested Headwater Catchment

Oanh

Gomi

Moore

et al. 2021

Water

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Stream temperature is a critical parameter for understanding hydrological and biological processes in stream ecosystems. Although a large body of research has addressed the effects of forest harvesting on stream temperature, less is known about the responses of stream temperature to the practice of strip-thinning, which produces more coherent patches of shade and sunlight areas. In this study, we examined stream temperature response to 50% strip-thinning in a 17 ha headwater catchment. The thinning lines extended through the riparian zone. Paired-catchment analysis was applied to estimate changes in daily maximum, mean, and minimum stream temperatures for the first year following treatment. Significant effects on daily maximum stream temperature were found for April to August, ranging from 0.6 °C to 3.9 °C, similar to the magnitude of effect found in previous studies involving 50% random thinning. We conducted further analysis to identify the thermal response variability in relation to hydrometeorological drivers. Multiple regression analysis revealed that treatment effects for maximum daily stream temperature were positively related to solar radiation and negatively related to discharge. Frequent precipitation during the summer monsoon season produced moderate increases in discharge (from 1 to 5 mm day−1), mitigating stream temperature increases associated with solar radiation. Catchment hydrologic response to rain events can play an important role in controlling stream thermal response to forest management practices.

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Section: Introductionmentioning

confidence: 99%

Stream Temperature Response to 50% Strip-Thinning in a Temperate Forested Headwater Catchment

Oanh

Gomi

Moore

et al. 2021

Water

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“…Stream temperature

\left({T}_w\right)

is an important control on a range of biogeochemical, biological and ecological processes in aquatic systems (Webb et al, 2008). Decades of research in a range of forest ecosystems have demonstrated that reductions in riparian shade by logging, vegetation management or natural disturbance result in summertime warming by increasing the amount of solar radiation reaching the stream (Bladon et al, 2018; Brown, 1969; Isaak et al, 2010; Leach et al, 2022; Leach & Moore, 2010; Lynch et al, 1984; Raulerson et al, 2020; Rex et al, 2012; Rishel et al, 1982; Rowe & Pearce, 1994; Rowe & Taylor, 1994; Stott & Marks, 2000). The magnitude of post‐harvest warming depends not only on the amount of shade reduction, but also factors such as catchment area, channel morphology and substrate, weather conditions, and the quantity and source components of stream discharge (Beyene & Leibowitz, 2024; Coats & Jackson, 2020; Gomi et al, 2006; Janisch et al, 2012; Miralha et al, 2024; Moore et al, 2023; Oanh et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

JAMES BUTTLE REVIEW: Quantifying the influence of forestry and forest disturbance on stream temperature: Methodologies and challenges

Moore,

MacDonald

2024

Hydrological Processes

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Stream temperature governs many aquatic ecosystem processes and plays a key role in determining the distribution of cold‐water amphibians and cool‐ and cold‐water fish, including salmonids. Decades of research have focused on the effects of forestry and forest disturbance on stream temperature, and new projects are underway or being planned in jurisdictions including the Provinces of Alberta and British Columbia, Canada, and Washington State, USA. The objective of this paper is to provide a critical review of methodologies employed in previous studies. The review initially focuses on the range of metrics used to quantify stream thermal regimes and the factors that control stream temperature variability in time and space, then focuses on sampling and analytical methodologies used to quantify stream temperature response to forestry activity and forest disturbance. Empirical methods include sampling in time, space, or both, and may or may not include pre‐ and post‐harvest data. Process‐based mechanistic and hybrid empirical‐mechanistic models have also been applied. The advantages and disadvantages of these approaches are discussed, and recommendations provided to support the design and execution of future studies.

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“…Water temperature is an important control on many biogeochemical, biological and ecological processes in aquatic systems (Webb et al, 2008). Decades of research in a range of forest ecosystems have demonstrated that reductions in riparian shade by logging, vegetation management or natural disturbance result in summertime warming by increasing the amount of solar radiation reaching the stream (Bladon et al, 2018; Brown, 1969; Isaak et al, 2010; Leach et al, 2022; Leach & Moore, 2010; Lynch et al, 1984; Raulerson et al, 2020). Many studies have quantified stream temperature response to forestry using paired‐catchment studies or other forms of before‐after/control‐impact (BACI) designs (e.g., Bladon et al, 2016; Gravelle & Link, 2007; Groom, Dent, Madsen, & Fleuret, 2011; Harris, 1977; Janisch et al, 2012; Johnson & Jones, 2000; Macdonald et al, 2003; Mellina et al, 2002; Rayne et al, 2008; Rex et al, 2012; Swartz et al, 2020), and some have documented changes in response magnitude over several years post‐harvest (e.g., Gomi et al, 2006; Harris, 1977; Johnson & Jones, 2000; Leach et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Headwater stream temperature response to forest harvesting: Do lower flows cause greater warming?

Moore,

Guenther,

Gomi

et al. 2023

Hydrological Processes

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This study addressed two hypotheses regarding the relationship between stream temperature response to shade removal and streamflow: (a) that temperature response increases as flow declines and (b) that the relationship can be complicated by shifts in dominant streamflow sources and pathways during low‐flow periods. The study was based on a paired‐catchment design in rain‐dominated headwater catchments in the southern Coast Mountains of British Columbia, Canada, and focused on the effect of a 50% thinning treatment on daily maximum temperature in June, July and August for three sites within the harvest treatment. At the two upstream sites, the treatment response exhibited a negative relationship with daily mean streamflow, especially for days with high incident solar radiation. This result suggests that the effectiveness of forest practice rules for protecting cold‐water habitat may be reduced under future climatic conditions characterized by more frequent extended drought. However, stream temperature response at the most downstream site exhibited a pronounced inverted‐U‐shaped relationship with streamflow measured at a weir. It is hypothesized that the response at the most downstream temperature logger was controlled by the existence of a stable, relatively cool inflow just upstream of the logger, which represented an increasing fraction of flow as streamflow generated higher up in the catchment declined through time. There was a lack of convergent surface topography upstream of the logger, and it is hypothesized that localized inflow may have been controlled by the topography of the soil‐till interface and/or originated as hyporheic discharge.

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Do southern Appalachian Mountain summer stream temperatures respond to removal of understory rhododendron thickets?

Abstract: This is the author manuscript accepted for publication and has undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

Cited by 9 publications

References 73 publications

Stream Temperature Response to 50% Strip-Thinning in a Temperate Forested Headwater Catchment

Stream Temperature Response to 50% Strip-Thinning in a Temperate Forested Headwater Catchment

JAMES BUTTLE REVIEW: Quantifying the influence of forestry and forest disturbance on stream temperature: Methodologies and challenges

Headwater stream temperature response to forest harvesting: Do lower flows cause greater warming?

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