A5081959575- Peatlands and Wetlands Ecology
- Soil and Water Nutrient Dynamics
- Marine and coastal ecosystems
- Coastal wetland ecosystem dynamics
- Atmospheric and Environmental Gas Dynamics
- Fire effects on ecosystems
- Education Systems and Policy
- Water Quality and Pollution Assessment
- Geology and Paleoclimatology Research
- Aquatic Ecosystems and Phytoplankton Dynamics
- Fish Ecology and Management Studies
- Polar Research and Ecology
- Cryospheric studies and observations
- Soil Carbon and Nitrogen Dynamics
- Methane Hydrates and Related Phenomena
- Microbial Community Ecology and Physiology
- Mining and Resource Management
- Ruminant Nutrition and Digestive Physiology
- Wastewater Treatment and Nitrogen Removal
- Mine drainage and remediation techniques
- Higher Education Research Studies
- Marine and coastal plant biology
- Coal and Its By-products
- Urban, Neighborhood, and Segregation Studies
- Pesticide and Herbicide Environmental Studies
UK Centre for Ecology & Hydrology
2017-2024
Indiana University
2022
University of Edinburgh
2016-2017
Inland waters play an active role in the global carbon cycle and emit large volumes of greenhouse gases (GHGs), methane (CH4 ) dioxide (CO2 ). A considerable body research has improved emissions estimates from lakes, reservoirs rivers but recent attention been drawn to importance small, artificial waterbodies as poorly quantified potentially important emission hotspots. Of particular interest are drainage ditches constructed ponds. These waterbody types prevalent many landscapes their...
Abstract The dissolved organic carbon (DOC) export from land to ocean via rivers is a significant term in the global C cycle, and has been modified many areas by human activity. DOC exports large are fairly well quantified, but those smaller river systems, including draining oceanic regions, generally under-represented syntheses. Given that these regions typically have high runoff peat cover, they may exert disproportionate influence on land–ocean export. Here we describe comprehensive new...
There is growing global concern that greenhouse gas (GHG) emissions from water bodies are increasing because of interactions between nutrient levels and climate warming. This paper investigates key land-cover, seasonal hydrological controls GHGs by comparison the semi-natural, agricultural urban environments in a detailed source-to-sea study River Clyde, Scotland. Riverine GHG concentrations were consistently oversaturated with respect to atmosphere. High riverine methane (CH4) primarily...
Abstract. Lakes and ponds experience anthropogenically forced changes that may be non-linear sometimes initiate ecosystem feedbacks leading to tipping points beyond which impacts become hard reverse. In many cases climate change is a key driver, in concert with other stressors. are also important players the global by ventilating large share of terrestrial carbon (C) back atmosphere as greenhouse gases will likely provide substantial change. this paper we address various major lake...
Abstract The transport of dissolved organic matter (DOM) across the land-ocean-aquatic-continuum (LOAC), from freshwater to ocean, is an important yet poorly understood component global carbon budget. Exploring and quantifying this flux a significant challenge given complexities DOM cycling these contrasting environments. We developed new model, UniDOM, that unifies concepts, state variables parameterisations turnover LOAC. Terrigenous divided into two pools, T 1 (strongly-UV-absorbing) 2...
Abstract The flux of terrigenous organic carbon through estuaries is an important and changing, yet poorly understood, component the global cycle. Using dissolved (DOC) fluorescence data from 13 British draining catchments with highly variable land uses, we show that use strongly influences fate DOC across ocean transition via its influence on composition lability constituent matter (DOM). In peatland‐dominated catchments, was correlated biologically refractory “humic‐like” material which...
The role of plant phenology as a regulator for gross ecosystem productivity (GEP) in peatlands is empirically not well constrained. This because proxies to track vegetation development with daily coverage at the scale have only recently become available and lack such data has hampered disentangling biotic abiotic effects. study aimed unraveling mechanisms that regulate seasonal variation GEP across network eight European peatlands. Therefore, we described canopy greenness derived from...
Inland waters are important sources of greenhouse gases and emissions from polluted subtropical systems may be contributing to the observed global increase in atmospheric methane concentrations. Here we detail a scoping study where dissolved concentrations (CH4), carbon dioxide (CO2) nitrous oxide (N2O) were measured two contrasting urban lakes Bangalore (Bengaluru), Karnataka, India, June 2018 February 2020. Bellandur Lake is severely system whilst Jakkur has been subject partial...
This study trialled a convolutional neural net (CNN)-based approach to mapping peat ditches from aerial imagery. Peat were dug in the last century improve moorland for agriculture and forestry at expense of habitat health carbon sequestration. Both quantitative assessment drained areas restoration efforts re-wet peatlands through ditch blocking would benefit an automated method mapping, as current involve time-consuming field desk-based efforts. The availability LiDAR is still limited many...
Abstract. Aquatic systems draining peatland catchments receive a high loading of dissolved organic carbon (DOC) from the surrounding terrestrial environment. Whilst photo-processing is known to be an important process in transformation aquatic DOC, drivers temporal variability this pathway are less well understood. In study, 8 h laboratory irradiation experiments were conducted on water samples collected two contrasting Scotland: stream and reservoir catchment with percentage peat cover....
Water pollution arising from abandoned coal mines, is second only to sewage as a source of freshwater and in coalfield catchments mine water can be the dominant pollutant, with oxidised iron smothering bed receiving rivers. This study measured greenhouse gases outflows sixteen sites across Midland Valley Scotland. Radiogenic stable carbon isotopes measurements (Δ14C δ13C) were used determine sources both methane (CH4) dioxide (CO2) produced within flooded environment. Concentrations CH4-C...
Abstract. Three different nitrogen (N) fertiliser types, ammonium nitrate, urea and coated with a urease inhibitor (Agrotain®), were applied at standard rates (70 kg N ha−1) to experimental plots in typical intensively managed grassland area the Easter Bush Farm Estate (Scotland). The use efficiency of fertilisers was investigated as well losses form nitrous oxide fluxes (N2O) ammonia (NH3) during fertilisation events 2016 2017 growing seasons. Nitrous measured by static chamber technique...
Abstract. Determining the concentration and composition of dissolved organic carbon (DOC) in glacial ecosystems is important for assessments situ microbial activity contributions to wider biogeochemical cycles. Nonetheless, there limited knowledge abundance character DOC basal ice subglacial environment a lack quantitative data on low-molecular-weight (LMW) components, which are believed be highly bioavailable microorganisms. We investigated via molecular-level analysis. Spectrofluorometry...
Abstract. Direct land-to-atmosphere carbon exchange has been the primary focus in previous studies of peatland disturbance and subsequent restoration. However, loss via fluvial pathway is a significant term budgets requires consideration to assess overall impact restoration measures. This study aimed determine effect land management regime on aquatic concentrations fluxes an area within UK's largest tract blanket bog, Flow Country northern Scotland. Three sub-catchments were selected...
Dissolved inorganic carbon (DIC) fluxes from the land to ocean have been quantified for many rivers globally. However, CO2 atmosphere inland waters are quantitatively significant components of global cycle that currently poorly constrained. Understanding, relative contributions natural and human-impacted processes on DIC within catchments may provide a basis developing improved management strategies mitigate free concentrations in subsequent evasion atmosphere. Here, large, internally...
Abstract. In the UK, most large reservoirs constructed for public water supply are in upland areas. Many situated catchments characterised by organic-rich soils, including peatlands. Although these soils naturally leach amounts of dissolved organic matter (DOM) to water, widespread degradation peat UK is believed have exacerbated rates DOM loss. High and rising concentrations regions raise treatment challenges industry. companies increasingly considering whether upland-catchment restoration...
Silicon (Si) is an essential nutrient element in freshwater and marine ecosystems, its abundance relative to macro-nutrients (N, P) can impact phytoplankton communities eutrophic rivers estuaries. This study the first national assessment examining (i) primary sources (geological, biological, landcover) controls (geomorphological, precipitation) on transport of terrestrial dissolved silicon across Great Britain ocean, (ii) current extent nature interactions with these catchments relation...
This essay describes the decline in number of participants enrolled federally-funded adult basic education (ABE), secondary (ASE), and English Language (EL) programs.Enrollment data since 1965 indicate a steep consistent downward trend adults enrolling these programs 1990s.Importantly, program year 2000-2001, first reflecting standardized reporting, there has been 65.8% reduction ABE/ASE students 49.2% EL students.The purpose this article is to highlight long-term nature trends, ask critical...
Abstract. Aquatic systems draining peatland catchments receive a high loading of dissolved organic carbon (DOC) from the surrounding terrestrial environment. Whilst photo-processing is known to be an important process in transformation aquatic DOC, drivers temporal variability this pathway are less well understood. In study, laboratory irradiation experiments were conducted on water samples collected two contrasting Scotland. The first system was stream Auchencorth Moss with DOC...
<p>Maintenance and enhancement of peatland carbon storage is a major policy objective towards meeting greenhouse gas (GHG) targets. Management interventions can influence both the capacity vulnerability stock to climate-change induced increases in drought frequency severity, incidence wildfires. Quantification these interactions vital informing best management practice, but also challenging, given ephemeral nature climatic extremes usual paucity high-quality ground-based...