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Conceptualizing catchment processes affecting stream chemistry

from basic understanding to practical applications

Tiwari, Tejshree (2015). Conceptualizing catchment processes affecting stream chemistry. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2015:67
ISBN 978-91-576-8332-8
eISBN 978-91-576-8333-5
[Doctoral thesis]

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Abstract

Maintaining good surface water quality is recognized as one of the greatest challenges for future generations. In northern-latitudes, it is predicted that aquatic ecosystems may experience a large climatic change. This could have dramatic consequences for the hydrological cycle, which influences many biogeochemical process and ultimately stream water quality. Additionally, increasing demand for forest resources can increase the pressure on water resources in the boreal forest that already experience large scale industrialized forestry. However, before the combined effects of climate change and forestry on stream chemistry can be understood, the basic principles of how catchments function are first a prerequisite.

In this thesis, investigating the natural variability of stream water quality in a meso-scale boreal catchment showed that temporal and spatial variation in hydrology within catchment landscape types was the main regulator of stream water quality. Shallow groundwater from the dominant landscape types regulated stream chemistry during high and intermediate flows, while large inputs of deep groundwater regulated the chemistry during base flow when the connectivity between landscape types decreased.
Additionally, specific landscape attributes reflected different processes occurring in the catchment. By identifying the areal coverage, riparian soils, and connectivity of the catchment landscapes, this work has led to an improved understanding of dissolved organic carbon (DOC), conservative elements, redox sensitive elements as well as those with high affinity for organic matter, and elements derived from atmospheric deposition.

Applying the new conceptual understanding to predict future effects showed that warmer and wetter conditions, as indicated by future climate and forestry scenarios, suggest there may be increased DOC concentrations and fluxes in streams which will be driven by both climate change and forestry effects. Further applications of this new catchment biogeochemical processes understanding to forest management showed that a more cost effective solution for forest management can be achieved by strategically targeting the most vulnerable and sensitive areas of the riparian zone by using a hydrologically adapted buffer zone strategy.

Authors/Creators:Tiwari, Tejshree
Title:Conceptualizing catchment processes affecting stream chemistry
Subtitle:from basic understanding to practical applications
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :3 September 2015
Depositing date:17 September 2015
Volume:2015:67
Number of Pages:50
Papers/manuscripts:
NumberReferences
ITiwari, T., H. Laudon, K. Beven, and A. M. Ågren (2014), Downstream changes in DOC: Inferring contributions in the face of model uncertainties, Water Resources Research, 50, 514-525
IITejshree Tiwari, Fredrik Lidman, Hjalmar Laudon, William Lidberg, Anneli M. Ågren, The role of scale, riparian soils and connectivity for predicting stream water chemistry, (Manuscript).
IIIStephen K. Oni, Tejshree Tiwari, Martyn N. Futter, Anneli M. Ågren, Claudia Teutschbein, José L. J. Ledesma, Jakob Schelker, Hjalmar Laudon, Local and landscape scale impacts of clear-cuts and climate change on surface water dissolved organic carbon in the boreal forests, (Submitted Manuscript).
IVTejshree Tiwari, Johanna Lundström, Lenka Kuglerová, Hjalmar Laudon, Karin Öhman, Anneli M. Ågren, Cost of Riparian buffer zones: A comparison of hydrologically adapted site-specific buffers with traditional fixed widths, (Submitted Manuscript).
Place of Publication:Umeå
Publisher:Department of Forest Ecology and Management, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8332-8
ISBN for electronic version:978-91-576-8333-5
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:K Forestry > K01 Forestry - General aspects
P Natural resources > P10 Water resources and management
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Oceanography, Hydrology, Water Resources
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Agrovoc terms:watersheds, boreal forests, rivers, water quality, chemicophysical properties, carbon, organic matter, forest soils, riparian zones, landscape, climatic change, models
Keywords:Dissolved Organic Carbon, Boreal catchment, Stream Chemistry, Forestry and Climate Change, Interdisciplinary Research, Riparian buffer zones, Flow paths
URN:NBN:urn:nbn:se:slu:epsilon-e-2944
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-2944
ID Code:12618
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
External funders:FORMAS
Deposited By: tejshree tiwari
Deposited On:18 Sep 2015 08:21
Metadata Last Modified:22 Sep 2015 10:11

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