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Sources, composition and transport of fluvial suspended sediment and attached phosphorus in agricultural catchments : a cross-scale analysis

Sandström, Sara (2022). Sources, composition and transport of fluvial suspended sediment and attached phosphorus in agricultural catchments : a cross-scale analysis. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880
ISBN 978-91-7760-973-5
eISBN 978-91-7760-974-2
[Doctoral thesis]

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Abstract

Soil loss from arable land is a major environmental issue, as well as freshwater and marine eutrophication. Both these issues are well connected, since particles often transport phosphorus (P) from agricultural areas to surface waters, causing eutrophication. The main objective of this thesis was to gain a deeper understanding of the relationship between P and suspended solids (SS) in agricultural streams, to study the quantity and quality of P on SS and the role of catchment properties. By using long-term monitoring data on small agricultural catchments it was established that SS is a vector for P transport, and that SS concentrations in small streams are well correlated to clay content and share agricultural land. These relations were also up-scaled and corroborated for the tributaries to Lake Mälaren in spite of their larger size and more heterogeneous land use. Testing stream nutrient concentration trends in these catchments over the last 20 years resulted in few significant decreasing trends, due to the low degree of implementation of mitigation measures and the historical legacy effects. Catchment properties such as elevation, land use and soil type were also used as input variables in high resolution distributed dynamic modelling of SS transport from six small catchments with good agreement to observed data, which makes possible reliable modelling of similar, unmonitored catchments. Field and laboratory studies of three small catchments sampling fluvial suspended sediment showed variation in iron-bound P with seasons, with increases during summer and decreases during winter, high flow periods. Each catchment had different dominating P fractions, in spite of similar total P concentrations. To achieve water quality goals we need to focus resources where they have the highest effect.

Authors/Creators:Sandström, Sara
Title:Sources, composition and transport of fluvial suspended sediment and attached phosphorus in agricultural catchments : a cross-scale analysis
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2022
Number:2022:49
Number of Pages:87
Publisher:Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-973-5
ISBN for electronic version:978-91-7760-974-2
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
Keywords:phosphorus, suspended sediment, erosion, high resolution modelling, headwaters, agricultural streams, land use, soil distribution, water quality trends, GIS
URN:NBN:urn:nbn:se:slu:epsilon-p-118804
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-118804
ID Code:28790
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:06 Sep 2022 11:14
Metadata Last Modified:06 Sep 2022 11:21

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