Article
Forestry
Annamari (Ari) Lauren, Mingfu Guan, Aura Salmivaara, Antti Leinonen, Marjo Palviainen, Samuli Launiainen
Summary: The study developed a spatially-distributed nutrient balance model which can help forest managers identify current and future nutrient export hot spots and compare different logging scenarios. Results show that the model can effectively assess the impact of logging on nutrient export and find suitable scenarios that balance wood supply and acceptable levels of nutrient export.
Article
Forestry
Antti Leinonen, Aura Salmivaara, Marjo Palviainen, Leena Finer, Heli Peltola, Annamari Lauren
Summary: This study investigated the impact of forest clear-cutting on nitrogen and phosphorous export in water systems, finding that the location of clear-cuts had different effects on nutrient export and only 5% of the forest area could contribute to half of the total export. A conceptual planning framework was proposed based on the findings to identify areas with high nutrient export, aiming to improve the effectiveness of water protection measures in forestry.
Article
Environmental Sciences
W. Y. Lam, R. W. Mackereth, C. P. J. Mitchell
Summary: Mercury is a widespread contaminant that poses risks to wildlife and human health. This study focuses on boreal forests and quantifies factors influencing mercury export from these areas. The research shows that mercury concentrations are relatively low, but there are significant differences in mercury export. Coniferous forest cover is an important predictor of mercury loads, and wet forest cover can be used as an effective alternative metric.
Article
Environmental Sciences
Olga V. Churakova (Sidorova), Trevor J. Porter, Mikhail S. Zharkov, Marina Fonti, Valentin V. Barinov, Anna Taynik, Alexander Kirdyanov, Anastasya A. Knorre, Martin Wegmann, Tatyana Trushkina, Nataly N. Koshurnikova, Eugene A. Vaganov, Vladimir S. Myglan, Rolf T. W. Siegwolf, Matthias Saurer
Summary: This study analyzed stable isotopes in tree rings from Canada and found that summer air temperature plays a crucial role in determining tree ring isotope variability. The study also identified the effects of precipitation, relative humidity, vapor pressure deficit, and sunshine duration on tree ring isotopes. By combining multiple stable isotopes in tree ring studies, a comprehensive description of climate variability in boreal regions can be achieved.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Ahti Lepisto, Antti Raike, Tapani Sallantaus, Leena Finer
Summary: Brownification, caused by increasing dissolved organic carbon (DOC) concentrations, poses a threat to aquatic ecosystems in Europe. Changes in total organic carbon (TOC) concentrations are significantly influenced by mean air temperature and sulphate concentrations, with climate warming expected to have a more pronounced impact on TOC leaching in the future. The increase in drainage percentage is positively correlated with increases in total organic nitrogen (TON), highlighting the importance of land management in the context of water quality.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Ecology
Gustaf Granath, Christopher D. Evans, Joachim Strengbom, Jens Folster, Achim Grelle, Johan Stromqvist, Stephan J. Kohler
Summary: This study found that wildfires result in significant direct losses of C and N elements in ecosystems, with soil respiration and aquatic losses also playing important roles. While aquatic C and N losses were minor and did not increase post-fire, other elements like Ca and S showed ecologically relevant increases in fluvial export and concentration. The study also highlighted the presence of faster and slower-release nutrient pools in stream concentrations, with nutrient fluxes largely returning to pre-fire conditions three years after the fire.
Article
Geochemistry & Geophysics
Ni Su, Shouye Yang, Kai Deng, Yuan-Pin Chang, Juan Xu, Zhouyang Wu
Summary: Small mountainous rivers in subtropical Taiwan supply large quantities of suspended and dissolved materials to the ocean, reflecting the high denudation rates in their elemental and isotopic compositions of river water and sediment.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Water Resources
Aaron Smith, Doerthe Tetzlaff, Christian Marx, Chris Soulsby
Summary: Increased urbanization and climate change require further evaluation of the impact of urban development on water flow paths for sustainable land-use planning. The complex interaction of water fluxes within urban water stores and their effects on streamflow regimes over time need to be quantified. This study utilized hydrological and water stable isotope datasets to evaluate water flow paths and ages in a heavily urbanized catchment in Berlin. The results provide valuable information for assessing the uncertainty of urban impacts on hydrological function under environmental change.
HYDROLOGICAL PROCESSES
(2023)
Article
Environmental Sciences
Yanju Ma, Keith A. Hobson, Kevin J. Kardynal, Christopher G. Guglielmo, Brian A. Branfireun
Summary: Migratory songbirds breeding in the Canadian Boreal forest are exposed to mercury, with exposure levels depending on various factors. A Canada-wide dataset of nearly 2000 migratory songbirds showed a clear geographic gradient in feather mercury concentrations and dietary guild as a strong predictor of feather mercury levels.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Review
Environmental Sciences
K. Heikkinen, M. Saari, J. Heino, A-K Ronkanen, P. Kortelainen, S. Joensuu, A. Vilmi, S-M Karjalainen, S. Hellsten, M. Visuri, H. Marttila
Summary: Iron is a key element in aquatic ecosystems worldwide, with diverse impacts on abiotic and biotic processes. This study highlights the importance of managing and protecting iron in boreal catchments, focusing on prevention strategies, controlling iron-rich groundwater discharge, and reducing iron transport to watercourses for effective water pollution control. Further research is needed to understand the role of iron in riverine food webs and develop methods to mitigate its harmful impacts in water management.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Forestry
Aura Salmivaara, Antti Leinonen, Marjo Palviainen, Natalia Korhonen, Samuli Launiainen, Heikki Tuomenvirta, Liisa Ukonmaanaho, Leena Finer, Annamari (Ari) Lauren
Summary: Weather and forest management affect nutrient export from land to water systems. The study quantified the variation in nitrogen and phosphorus export in a Finnish catchment under different weather and forest management scenarios. Results showed that nutrient export increased more under wet and mild weather than under clear-cutting scenarios. Dry weather significantly decreased nutrient export. Maintaining a good ecological status in aquatic systems may be challenging in the future if extreme wet years occur more frequently.
Article
Environmental Sciences
C. A. Ross, N. J. Casson, M. Tenuwara
Summary: Understanding hydrological dynamics in boreal Shield catchments is essential for predicting changes in stream runoff and chemistry in response to climate change. This study used long-term data to assess event-scale hydrologic response dynamics and stream loads of nitrate and chloride, revealing significant variability in both hydrologic response and loads between seasons.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Engineering, Civil
Lena-Marie Kuhlemann, Doerthe Tetzlaff, Chris Soulsby
Summary: This study conducted spatio-temporal sampling of isotopes and water quality measurements in the peri-urban Erpe catchment near Berlin to assess seasonal changes in water sources during warm and dry years. Results showed deterioration of water quality downstream of wastewater treatment plants and a shift from groundwater-fed streams to wastewater-dominated flows in the upper reaches during summer. The study highlights the need for monitoring of different tracers to better characterize water impacts in urbanized catchments with complex land use distributions.
JOURNAL OF HYDROLOGY
(2021)
Article
Ecology
Alex J. Webster, Thomas A. Douglas, Peter Regier, Mark D. Scheuerell, Tamara K. Harms
Summary: Temporal patterns in stream chemistry provide integrated signals describing the hydrological and ecological state of whole catchments. Analyzing these patterns in permafrost-influenced boreal catchments in Interior Alaska revealed the positive influence of permafrost on fDOM export and the differences in solute dynamics between catchments with varying extents of permafrost. This study highlights the importance of understanding the impact of permafrost thaw on catchment hydrology and biogeochemistry.
Article
Water Resources
Ioannis Matiatos, Anastasios Papadopoulos, Yiannis Panagopoulos, Elias Dimitriou
Summary: Water isotopes (δ18O and δD) were systematically monitored in two river catchments to investigate the spatiotemporal variation and differences between them. The Pinios River Basin exhibited lower average values compared to the Evrotas River Basin but higher in range. The Bayesian modelling results showed higher groundwater contribution in the Pinios River Basin than in the Evrotas River Basin during the wet period. Isotopic spatial variability was attributed to local precipitation, evaporation, and additional flow pathways. The isotopic composition was controlled by catchment altitude, slope, and discharge. This study highlights the importance of catchment physiography in water resources management.
HYDROLOGICAL SCIENCES JOURNAL
(2023)
Article
Biodiversity Conservation
Xudan Zhu, Liang Chen, Jukka Pumpanen, Anne Ojala, John Zobitz, Xuan Zhou, Hjalmar Laudon, Marjo Palviainen, Kimmo Neitola, Frank Berninger
Summary: This study investigated the impacts of climate change-induced terrestrial productivity increase and hydrology changes on DOC concentrations in boreal catchments. The combined effects of terrestrial productivity and discharge explained 62% of aquatic DOC variations, with different impacts observed in catchments of varying sizes. Increasing RE always made a positive contribution to DOC concentration, highlighting the importance of DOC fluxes in regulating ecosystem C budgets.
GLOBAL CHANGE BIOLOGY
(2022)
Article
Plant Sciences
Pablo Urrutia-Cordero, Silke Langenheder, Maren Striebel, David G. Angeler, Stefan Bertilsson, Peter Eklov, Lars-Anders Hansson, Egle Kelpsiene, Hjalmar Laudon, Maria Lundgren, Linda Parkefelt, Ian Donohue, Helmut Hillebrand
Summary: Ecological stability is a complex concept that involves multiple dimensions of functional and compositional responses to environmental change. Our study introduces an integrative metric of overall ecological vulnerability (OEV) that captures both functional and compositional aspects, providing a framework for assessing ecological risk and management. The findings highlight the importance of considering multiple stability components and their relationships in understanding ecosystems' vulnerability to environmental change.
JOURNAL OF ECOLOGY
(2022)
Article
Agronomy
Eduardo Martinez-Garcia, Mats B. Nilsson, Hjalmar Laudon, Tomas Lundmark, Johan E. S. Fransson, Jorgen Wallerman, Matthias Peichl
Summary: The forest floor acts as a source of CO2, with emissions increasing with stand age. Tree species and soil type have minimal effects on CO2 fluxes. Pine stands have higher understory production rates than spruce stands. Tree biomass is the major driver of CO2 flux variations.
AGRICULTURAL AND FOREST METEOROLOGY
(2022)
Article
Chemistry, Inorganic & Nuclear
Jamie Lee Stevenson, Josie Geris, Christian Birkel, Doerthe Tetzlaff, Chris Soulsby
Summary: Stable water isotopes are important tools in studying catchment functioning and are widely used in experimental catchments. However, high-frequency data collection is costly and not suitable for decision makers who need to understand the functioning of multiple catchments. Instead, reconnaissance style surveys provide a feasible alternative approach.
ISOTOPES IN ENVIRONMENTAL AND HEALTH STUDIES
(2022)
Article
Engineering, Civil
Christian Marx, Doerthe Tetzlaff, Reinhard Hinkelmann, Chris Soulsby
Summary: Stable isotopes were used to assess ecohydrological partitioning in different urban green spaces in Berlin, with a focus on the role of near-surface soils in determining water flows and cycling. Grassland soils were found to be wetter than soils under urban tree cover, indicating greater interception losses and transpiration from trees. Soil water isotopes showed distinct responses to precipitation inputs and evaporation, with the effects most pronounced under individual trees and grasslands. Mixing models revealed that grass likely recycled shallow, younger soil water in transpiration, while trees relied more on deeper, older sub-soil and groundwater sources. These preliminary results highlight the need for a better understanding of water movement and cycling in urban green spaces' shallow critical zone.
JOURNAL OF HYDROLOGY
(2022)
Article
Environmental Sciences
Aaron A. Smith, Doerthe Tetzlaff, Marco Maneta, Chris Soulsby
Summary: The dynamic interactions between water flux, storage, age, and response time have been analyzed using an ecohydrological model, revealing the impact of land use and soil composition on catchment functionality, as well as the degradation of process representation with changing model spatial resolution.
WATER RESOURCES RESEARCH
(2022)
Article
Engineering, Environmental
Songjun Wu, Doerthe Tetzlaff, Tobias Goldhammer, Jonas Freymueller, Chris Soulsby
Summary: In-stream water quality in riparian wetlands is influenced by both hydrological and biogeochemical controls. This study used an isotope-based mixing model to differentiate the dominance of these controls. The model revealed that groundwater inflows were predominant most of the time, but lateral inflows and channel leakage became more important in mid-summer. The model also predicted concentrations of nutrients and ions, allowing the identification of hydrologically-controlled, biogeochemically-controlled, and dual-controlled parameters. This method provides a robust tool for understanding the relative strengths of hydrological and biogeochemical controls in water quality.
Article
Environmental Sciences
M. Skerlep, S. Nehzati, R. A. Sponseller, P. Persson, H. Laudon, E. S. Kritzberg
Summary: Increasing iron concentrations in freshwaters across northern Europe have led to browning, affecting aquatic organisms and drinking water production. The contribution of different sources to stream iron concentrations is not well understood. This study investigated the role of riparian and mire soils in regulating iron patterns in a boreal stream network over 18 years. Results showed that riparian soils were major contributors to increasing freshwater iron concentrations, and drought events led to prolonged release of iron from organic soils, with potential long-term effects on stream iron concentrations.
GLOBAL BIOGEOCHEMICAL CYCLES
(2023)
Review
Forestry
Hjalmar Laudon, Eliza Maher Hasselquist
Summary: Continuous-cover forestry (CCF) is being considered as a potential alternative to clear-cut harvesting in boreal forests to improve water quality and quantity, biodiversity, and carbon sequestration. This study reviews the empirical evidence for the benefits of CCF on drained forested peatlands, discusses potential risks and uncertainties, and highlights unanswered questions before large-scale implementation. The ability to maintain forest production on drained peatlands depends on water regulation of groundwater table, and CCF could provide an alternative approach to manage groundwater without disturbing the existing artificial channel network. While CCF could lower the risk of flooding and droughts and enhance water quality and carbon sequestration, uncertainties remain regarding natural regeneration, soil damage, and the effects of climate change.
TREES FORESTS AND PEOPLE
(2023)
Article
Water Resources
Shirin Karimi, Jason Leach, Reinert Huseby Karlsen, Jan Seibert, Kevin Bishop, Hjalmar Laudon
Summary: Boreal catchments consist of different land covers, which result in different runoff responses to rainfall events. This study investigates the impact of peatlands on flood attenuation at both local and stream network scales. The results show that peatlands can attenuate floods in certain rainfall events, but in other events, the flood levels in peatland-dominated areas are similar to forest-dominated areas.
HYDROLOGICAL PROCESSES
(2023)
Article
Multidisciplinary Sciences
Johannes Larson, Jorgen Wallerman, Matthias Peichl, Hjalmar Laudon
Summary: Boreal forests have large carbon pools, with the organic layer being the largest carbon pool. The size of the soil carbon pool is positively related to simulated soil moisture conditions, while the tree carbon pool is influenced by moisture levels.
SCIENTIFIC REPORTS
(2023)
Article
Environmental Sciences
Virginia Mosquera, Hjalmar Laudon, Meredith Blackburn, Eliza Maher Hasselquist, Ryan A. Sponseller
Summary: Flow regulates the concentrations of different solutes differently, with organic solutes mainly limited by transport capacity and inorganic solutes mainly limited by their sources. The relationships between solute concentration and flow are influenced by catchment structure, and these changes can affect the concentrations and resource ratios of solutes in streams, with subsequent impacts on aquatic ecological processes.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Anna Lupon, Stefan Willem Ploum, Jason Andrew Leach, Lenka Kuglerova, Hjalmar Laudon
Summary: Preferential groundwater flow paths can influence dissolved organic carbon (DOC) concentration and export in the fluvial network. However, the mechanisms by which DRIPs influence longitudinal patterns of stream DOC concentrations are still poorly understood.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Johannes Larson, William Lidberg, Anneli M. Agren, Hjalmar Laudon
Summary: Soil moisture is important for drought and flooding forecasting, forest fire prediction and water supply management. Mapping soil moisture has been challenging due to forest canopy cover and small-scale variations. Terrain indices can effectively model the spatial variation of soil moisture conditions.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2022)
Article
Ecology
Aaron Smith, Doerthe Tetzlaff, Jessica Landgraf, Maren Dubbert, Chris Soulsby
Summary: The study investigates the water, energy, and biomass dynamics of soil and plants under willow trees in Berlin, Germany using stable water isotopes. The results show that willow trees have high water use through evapotranspiration, while grass has lower evapotranspiration. The use of in situ data aids in improving the model's capability to simulate xylem water sources and transport. The study is important for understanding water cycling in the critical zone.