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Phytotoxic Substances in Runoff from Forested Catchment Areas
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
Linköping University, Department of Physics, Chemistry and Biology, Biology. Linköping University, The Institute of Technology.
1991 (English)In: Humic substances in the aquatic and terrestrial environment : proceedings of an international symposium, Linköping, Sweden, August 21-23, 1989 / [ed] B. Allard, H. Borén and A. Grimvall, Berlin Heidelberg New York: Springer, 1991, 397-406 p.Chapter in book (Refereed)
Abstract [en]

Runoff from different catchment areas in southem Sweden was tested in a root bioassay based on solution cultures of cucumber seedlings. Water samples from agricultural catchment areas produced no signs at all or only weak signs of inhibited root growth, whereas several water samples from catchmcnt areas dominated by mires or coniferous forests produced visible root injuries. The most severe root injuries (very short roots, discolouration, swelling of root tips and lack of root hairs) were caused by samples from a catchment area without local emissions and dominated by old stands of spruce. Fractionation by ultrafiltration showed that the phytotoxic effect of these samples could be attributed to organic matter with a nominal molecular-weight  exceeding 1000 or to substances associated with organic macromolecules. Experiments aimed at concentrating phytotoxic compounds from surface water indicated that the observed growth  inhibition was caused by strongly hydrophilic substances. Previous reports on phytotoxic, organic substances of natura! origin have emphasized interaction between plants growing close together. The presence of phytotoxic substances in runoff indicates that there is also a large-scale dispersion of such compounds.

Place, publisher, year, edition, pages
Berlin Heidelberg New York: Springer, 1991. 397-406 p.
Series
Lecture Notes in Earth Science, ISSN 0930-0317 ; 33
Keyword [en]
Water Pollution
National Category
Environmental Sciences related to Agriculture and Land-use Chemical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-112204ISBN: 3-540-53702-3 (print)OAI: oai:DiVA.org:liu-112204DiVA: diva2:764116
Available from: 2014-11-18 Created: 2014-11-18 Last updated: 2014-11-21Bibliographically approved

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Grimvall, AndersBorén, HansWahlström, Dan

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