Eliza Maher Hasselquist
I use field surveys, stable isotopes, GIS, and hydrological modelling to study how human impacts on waterways and ecological restoration of those impacts affect tree growth, plant communities, and nutrient cycling in order to ensure high water quality and biodiversity while balancing societal needs for forest products. I research the effects of historic forestry activities on waterways and their riparian zones in relatively large but wadeable streams down to man-made forest drainage ditches in wetlands. In streams formerly channelized to facilitate timber floating in Sweden, I found that increasing hydrogeomorphic complexity increased biodiversity of instream organisms and riparian plants, but that it could take up to 25 years to recover. The Swedish forest industry also changed waterways by creating forest drainage ditches in the 1930s as part of a government work program to increase production of forest in wetlands. I am currently researching GIS and hydrological modelling methods that will provide guidelines on future management of ditches that balances the positive effects on tree productivity against potentially negative environmental impacts.
At SLU, I teach units on forest hydrology, in particular how forest drainage has affected forests and waterways. At Umeå University I taught plant inventory techniques in Ecological Field Methods (Ekologisk Fältmetodik), mushroom keying in Mushroom Identification (Svampkunskap), and plant anatomy and keying in first-year basic courses (Naturens mångfald och Basåret). I also supervised small research projects in Forest Ecology and Management as well as Ecology; which included supervising project development, field work, statistics and report writing. In this capacity, I've worked with students with many different cultural backgrounds from more than 10 different countries.
Swedish Research Council Formas Mobility Grant, 2019-2021: "Optimizing digital tools for balancing forest productivity and water quality when managing drained boreal forests" - 1 year at the Natural Resources Institute of Finland (Luke, Helsinki, Finland), 2 years at SLU in Umeå
Abstract: "Up to 15 million ha of northern peatlands have been drained for forestry; nearly 50% of these are in Fennoscandia. Ditch network maintenance (DNM) may be required to maintain drainage and timber productivity, but it is a large source of sediment and nutrients to receiving water bodies. There are currently no guidelines for how DNM should be targeted. In this project, I will combine two models, the Swedish Ditch Flow Tracker (DFT) and the Finnish Peatland Simulator SUSI, to create a new support tool for prioritizing DNM. DFT takes advantage of recently generated digital elevation models (DEMs) combined with hydrological modeling to locate ditches and estimate how large of an area is drained by them. SUSI is a stand-level process-based simulator that models stand water use, nutrient uptake, growth and yield, and finally economic performance of DNM. In this proposal, I will (i) merge the DFT and SUSI models to create a new synergized modelling tool, (ii) validate the results with previously collected tree growth and hydrological data from Sweden and Finland, and (iii) apply the merged model at the watershed-scale in both Sweden and Finland to be able to locate DNM operations to better balance tree production with water quality. By working on the development of a common, research-based tool for prioritizing DNM activities, I will contribute towards the economic and environmental sustainability of forestry by avoiding unprofitable DNMs and decreasing nutrient and sediment exports."
Water Joint Programming Initiative (JPI) 2018 JOINT CALL, 2019-2021:“REFORM WATER: Reducing the Effects of FORest Management to inland WATERs”
Abstract: "Many of the largest lakes in the Nordic countries, which are also among the most important raw water supplies for the major cities, are showing brownification e.g. increase in dissolved organic matter and humic substances. This phenomena, common across much of the northern latitudes, has primarily been suggested to result from processes related to the recovery from acid deposition and increase in winter precipitation. However, in the Nordic countries, land use primarily related to forest management on drained peatlands have also been shown to play an important role in the large scale brownification. As the demand for timber, pulpwood, renewable energy sources and biodegradable materials is increasing, there is an ongoing pressure to use the large timber stock on drained peatlands and to carry out ditch network maintenance (DNM) to maintain tree growth. Since up to 25% of the forest area in the Nordic countries is on drained peatlands, related increases in dissolved organic matter (DOM) and accompanying nutrient fluxes is one major threat to water quality. Warming climate, increasing growing stock and large scale DNM in forested peatlands are likely to enhance organic matter decomposition and subsequent brownification and eutrophication of water bodies, thus significantly affecting the water quality. There is significant timber stock in the large drained peatland forests that are soon coming to harvesting age. The aim of this study is therefore to quantify the effects of current management practices of peatland forests, such as harvesting and DNM, on the quality and the transport of DOM to aquatic systems. In addition, we will develop a novel tool based on biochar application to decrease the DOM and nutrient load to aquatic systems. Finally, we aim to develop state-of-the art process-modelling techniques for assessing the effects of forest management practices on water quality in peatland-dominated catchments, and for optimizing the production in such a way that enables wood production while keeping the adverse environmental impacts to a minimum."
Skogssällskapet (the Swedish Forest Society Foundation), 2017-2018: "When do we ditch the ditch? – A field test of the “DitchFlowTracker” to prioritize forest drainage ditch maintenance for sustainable forest management" link to the project at Skogssällskapet's website
I'm actively participating in the GRIP on LIFE Integrated project in collaboration with The Swedish Forest Agency (Skogsstyrelsen) and the County Administrative Board (Länsstyrelsen) of Västerbotten County
I am a representative for the Forest Faculty (S-fak) on the Steering Committee for the SLU Future Faculty, an organisation with the aim to promote the career of early career researchers at SLU.
Postdoc, Forest Biogeochemistry, 2015-2019 SLU, Umeå, Sweden
Funded by the Swedish Research Council Formas granted to Katarina Eckerberg (Department of Political Science, Umeå University) & Hjalmar Laudon: "Healthy Waters: The role of collaborative governance to minimize negative forestry impact on water quality"
Main advisor: Hjalmar Laudon
Ph.D., Ecology, 2010 - 2015 (25 Sept 2015) Umeå University, Umeå, Sweden
Thesis title: “Gradients of time and complexity: understanding how riparian and instream ecosystems recover after stream restoration”
Main Advisor: Christer Nilsson
M.S., Biology, 2002 - 2004 Idaho State University, Pocatello, ID, USA
Thesis title: “Effects of surrounding vegetation on establishment of conifer seedlings in alpine-treeline ecotones of the Rocky Mountains”
Main Advisor: Matthew J. Germino
B.S., Biology, 1999 Keene State College, Keene, NH, USA
Hanna Glöd, M.S., Thesis: “Forest drainage effects on tree growth in northern Sweden - developing guidelines for Ditch Network Maintenance” Forest Ecology & Management, SLU, Sweden, Feb 2018
Fanny Everheim, B.S., Thesis: “Effects of stream restoration on riparian bryophytes” Ecology and Environmental Science, Umeå University, Sweden, June 2016
Lisa Sandberg, M.S., Thesis: “Effects of restoration on instream bryophyte communities: monitoring of two different restoration techniques in the Vindel River system,” Ecology and Environmental Science, Umeå University, Sweden, January 2015
Hasselquist, E.M., LE. Polvi, M. Kahlert, C. Nilsson, L. Sandberg, and B.G. McKie. 2018. Contrasting responses among aquatic organism groups to changes in geomorphic complexity along a gradient of stream habitat restoration: implications for restoration planning and assessment. Water 10, 1465
Hasselquist, E.M., W. Lidberg, R.A. Sponseller, A. Ågren, & H. Laudon. 2018. Identifying and assessing the potential hydrological function of past artificial forest drainage. Ambio 47: 546https://doi.org/10.1007/s13280-017-0984-9
Kuglerová, L.*, E.M. Hasselquist*, J.S. Richardson, R. Sponseller, D. Kreutzweiser, & H. Laudon. 2017. Management perspectives on Aqua incognita: connectivity and cumulative effects of small natural and artificial streams in boreal forests. Hydrological Processes. 2017; 1-7. *shared first-authorship
Hasselquist, E.M., N.J. Hasselquist, J.P. Sparks, & C. Nilsson. 2017. Recovery of nitrogen cycling in riparian zones after stream restoration using δ15N along a 25-year chronosequence in northern Sweden. Plant and Soil. 410: 423–436
Hasselquist, E. M., C. Nilsson, J. Hjältén, D. Jørgensen, L. Lind, & L.E. Polvi. 2015. Time for recovery of riparian plants in restored northern Swedish streams: a chronosequence study. Ecological Applications. 25: 1373–1389
Nilsson, C., L.E. Polvi, J. Gardeström, E.M. Hasselquist, L. Lind & J.M. Sarneel. 2015. Riparian and in-stream restoration of boreal streams and rivers: success or failure? Ecohydrology. 8: 753–764
Jørgensen, D., C. Nilsson, A.R. Hof, E.M. Hasselquist, S. Baker, F.S. Chapin, K. Eckerberg, J. Hjältén, L.E. Polvi, & L.A. Meyerson. 2014. Policy Language in Restoration Ecology. Restoration Ecology. 22: 1–4.
Polvi, L.E., C. Nilsson, & E.M. Hasselquist. 2014. Potential and actual geomorphic complexity of restored headwater streams in northern Sweden. Geomorphology. 210: 99–118
Hasselquist, E.M., N.J. Hasselquist, & D.L. Rogers. 2013. Management of non-native annual plants to support recovery of an endangered perennial forb, Ambrosia pumila. Restoration Ecology. 21: 224–231
Maher, E.L., & M.J. Germino. 2006. Microsite differentiation among conifer species during seedling establishment at alpine treeline. Ecoscience. 13: 334–341
Maher, E.L., M.J. Germino, & N.J. Hasselquist. 2005. Interactive effects of tree and herb cover on survivorship, physiology, and microclimate of conifer seedlings in an alpine-treeline ecotone. Canadian Journal of Forest Research. 35: 567–574
Restoration, Riparian Buffer, Ditch cleaning, water quality, wetlands
Restaurering, återställande, dikesrensning, skyddzoner, vattenkvalitet, våtmark