Impacts of wildfire and salvage harvesting on water quality and nutrient exports from radiata pine and eucalypt forest catchments in south-eastern Australia

Smith, Hugh G.; Hopmans, P.; Sheridan, Gary; Lane, Patrick; Noske, Philip J.; Bren, Leon

doi:10.1016/j.foreco.2011.09.002

Cited by 20 publications

(13 citation statements)

References 45 publications

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“…An important consequence of wildfires is the increase of soil erosion with the accompanying transport of suspended fine sediments and dissolved nutrients downhill (Smith et al, 2011(Smith et al, , 2012. The siltation and compaction of the substrate with reduction of the interstitial water oxygen levels are one of the most important reasons for M. margaritifera decline.…”

Section: Tablementioning

confidence: 99%

Impacts of climate change and land-use scenarios on Margaritifera margaritifera, an environmental indicator and endangered species

Santos

Fernandes

Varandas

et al. 2015

Science of The Total Environment

104

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• Develop a verification scheme to check stress on M. margaritifera based on thresholds • Assess the impact of future climate change in conservation status of M. margaritifera • Assess the impact of land-use in habitat requirements of M. margaritifera • Propose conservation measures to prevent extinction of M. margaritifera in Portugal a b s t r a c t a r t i c l e i n f o In this study, we assess the impacts of future climate and land-use in the Beça River (northern Portugal) under different scenarios and how this will translate into the conservation status of the endangered pearl mussel Margaritifera margaritifera (Linnaeus, 1758). This species is currently present in several stretches of the Beça River that still hold adequate ecological conditions. However, the species is threatened by projected declines in precipitation for the 21st century, with implication on the river flows and water depths that might decrease below the species requisites. This situation could be especially critical during summer conditions since the ecological flows may not be assured and several river stretches may be converted into stagnant isolated pools. The habitat connectivity will also be affected with reverberating effects on the mobility of Salmo trutta, the host of M. margaritifera, with consequences in the reproduction and recruitment of pearl mussels. In addition, humanrelated threats mostly associated with the presence of dams and an predicted increases in wildfires in the future. While the presence of dams may decrease even further the connectivity and river flow, with wildfires the major threat will be related to the wash out of burned areas during storms, eventually causing the disappearance of the mussels, especially the juveniles. In view of future climate and land-use change scenarios, conservation strategies are proposed, including the negotiation of ecological flows with the dam promoters, the replanting of riparian vegetation along the water course and the reintroduction of native tree species throughout the catchment.

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Section: Tablementioning

confidence: 99%

Impacts of climate change and land-use scenarios on Margaritifera margaritifera, an environmental indicator and endangered species

Santos

Fernandes

Varandas

et al. 2015

Science of The Total Environment

104

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“…The strong relationships between plants and hydrology with nutrient cycling, availability and stoichiometry are now additionally being impacted by all those drivers of global change, such as land-use changes, drought, warming, eutrophication or invasive plant species, that alter plant structure and functioning, the hydrological cycle and nutrient availability itself. Land-use changes and water pollution related to urban and agricultural loadings (Mulholland et al, 1997;Sobota et al, 2009), increases in livestock (Chartier et al, 2011), changes in species distribution and the frequency of fire (Engel et al, 2005;Jacobs et al, 2007;Alexander and Arthur, 2010;Smith et al, 2012), forest management (Webb and Kathuria, 2012), land abandonment (Fu et al, 2009) and the intensification of agriculture followed, in most cases, by increases in N in runoff (Sobota et al, 2009) have been the key drivers of global change most studied in relation to shifts in biogeohydrology. We here focus on the impacts from climate change, eutrophication and invasive species on runoff and water redistribution by plants.…”

Section: Impacts Of Global Change On Nutrient Cycles In Plant-soil-wamentioning

confidence: 99%

Hydraulic redistribution by plants and nutrient stoichiometry: Shifts under global change

Sardans

Peñuelas²

2014

Ecohydrology

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Hydraulic lift, water movement from deep to upper soil layers by roots, is a widespread process in temperate and semi-arid environments. It can contribute 17-81% of total water transpired and favour the uptake of nutrients available mainly from soil organic matter decomposition (e.g. N). Downward siphoning, water movement from upper to deep soil layers, can represent 10-60% of total transpired water, favouring the uptake of nutrients supplied mainly from the leaching of bedrock minerals (e.g. P and K). These vertical water movements also can affect the N : P ratio of runoff waters when, in the case of hydraulic lift, they open the possibility for a given pulse of water to circulate multiple times across the N-rich upper soil layers. Plants, thus, affect the stoichiometry of nutrients in soils and groundwater not only through the physical protection of the soil and through the water uptake but also through water redistribution. Soil water redistribution can also play an outstanding role in the ecosystem responses to global change drivers. The increase in soil patchiness in current and future arid lands modifies runoff fluxes, hydraulic lift and downward siphoning, allowing plants to dispose of higher water and nutrient availabilities. The higher use of hydraulic lift and/or downward siphoning by alien species is a possible cause of alien plant success. Further mechanistic and quantitative research is thus warranted to discern the plant role in water and nutrient cycling and in the responses to global change.

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“…Phosphorus (P) plays an important role regulating primary productivity in lotic ecosystems and to the biogeochemical cycles of other major elements (Mainstone and Parr, 2002;Schindler, 2006). The concentration or production (yield and total export) of various forms of P in aquatic systems increases after wildfire (Prepas et al, 2003;Noske et al, 2010;Smith et al, 2012). Because P often limits the productivity of many aquatic systems (Elwood et al, 1981), postdisturbance P dynamics can form a strong mechanistic link between stream physical/geochemical conditions and their biological communities.…”

Section: Introductionmentioning

confidence: 99%

Five‐year legacy of wildfire and salvage logging impacts on nutrient runoff and aquatic plant, invertebrate, and fish productivity

et al. 2014

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Ecohydrological linkages between phosphorus (P) production, stream algae, benthic invertebrate, and fish communities were studied for 4 years after severe wildfire in the Rocky Mountains (Alberta, Canada). Mean concentrations of all forms of P (soluble reactive, total dissolved, particulate, and total) were 2 to 13 times greater in burned and post‐fire salvage‐logged streams than in unburned streams (p < 0.001). Post‐disturbance recovery of P was slow with differences in P‐discharge relationships still evident 5 years after the fire (p < 0.001). Coupled P and sediment interactions were likely responsible for slow recovery of P regimes in fire‐disturbed watersheds. P loading was associated with strong ecological responses in stream biota. Annual algal productivity was 5 to 71 times greater in streams within burned watersheds than in reference watersheds and persisted for 5 years after the fire (p < 0.001). Elevated algal production was associated with strong differences in benthic invertebrate community structure, including greater invertebrate densities, biomass, species diversity, and shifts in species composition. Monotonic shifts in invertebrate stable carbon and nitrogen isotope ratios indicated increased consumption of autochthonous food sources and effects on energy pathways for invertebrates from fire‐affected streams. Wildfire‐related changes at lower trophic lead to increases in size (weight and length) and growth rate (weight : age ratios) of cutthroat trout (Oncorhynchus clarki). This cascading series of effects of wildfire on stream productivity (primary production, secondary invertebrate consumers, and fish) may be long‐lived legacies of wildfire because of the slow recovery of P regimes. Copyright © 2014 John Wiley & Sons, Ltd.

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Impacts of wildfire and salvage harvesting on water quality and nutrient exports from radiata pine and eucalypt forest catchments in south-eastern Australia

Cited by 20 publications

References 45 publications

Impacts of climate change and land-use scenarios on Margaritifera margaritifera, an environmental indicator and endangered species

Impacts of climate change and land-use scenarios on Margaritifera margaritifera, an environmental indicator and endangered species

Hydraulic redistribution by plants and nutrient stoichiometry: Shifts under global change

Five‐year legacy of wildfire and salvage logging impacts on nutrient runoff and aquatic plant, invertebrate, and fish productivity

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