Introducing deep burrowing earthworms (Lumbricus terrestris L.) into arable heavy clay under boreal conditions |
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| Institution: | 1. Soils and Environment MTT Agrifood Research Finland, 31600 Jokioinen, Finland;2. Department of Environmental Management, University of Central Lancashire, PR1 2HE, Preston, UK;1. Research Area 1 “Landscape Functioning”, Working Group “Hydropedology”, Leibniz Centre for Agricultural Landscape Research (ZALF), Eberswalder Str. 84, D-15374 Müncheberg, Germany;2. Schmidt Institute of Physics of the Earth of Russian Academy of Sciences, Lab.202, Bolshaya Gruzinskaya str. 10/1, 123242 Moscow, Russia;1. Department of Geology, Faculty of Exact, Physico-Chemical and Natural Sciences, National University of Río Cuarto, Córdoba, Argentina;2. CONICET, National Council for Scientific and Technical Research, Argentina;3. Department of Science and Technology, National University of Quilmes, Bernal, Argentina;4. University Pierre et Marie Curie Paris 6, Paris, France, CIAT, TSBF_LAC, Cali, Colombia;1. Department of Agricultural Sciences, P.O. Box 27, Latokartanonkaari 5, Plant Production Sciences, FIN-00014 University of Helsinki, Finland;2. MTT Agrifood Research Finland, Plant Production, FIN-31600 Jokioinen, Finland;3. Department of Food and Environmental Sciences, P.O. Box 27, Latokartanonkaari 11, Environmental Soil Science, FIN-00014 University of Helsinki, Finland;1. UMR ECOSYS, INRA, AgroParisTech, Université Paris-Saclay, 78026 Versailles, France |
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| Abstract: | An inoculation of the deep burrowing earthworm Lumbricus terrestris L. was carried out for soil amelioration purposes at an arable field on heavy clay in southern Finland. L. terrestris, whilst entirely absent from the field and its immediate surrounding, was present in many other local soils. Prior to inoculation, field management was changed in favour of L. terrestris by improving the subdrainage and by implementation of reduced tillage. In Autumn 1996, 82 earthworm inoculation units (EIUs) were introduced in three transects at one end of the field, one transect lying within a permanent grass strip outside the cultivated area. In Autumn 1998, L. terrestris had persisted outside the cultivated area with maximum density of 28 ind. m−2 (median: 0 ind. m−2). No individuals were found inside the field. In Autumn 2003, maximum density was 43 ind. m−2 (median: 9 ind. m−2) outside the cultivated area, with evidence for 8 m dispersal from inoculation points (1.1 m year−1). In 2003 individuals were also found in low densities inside the field, close to subdrains, with a maximum density of 4 ind. m−2. Results call for critical evaluation of this inoculation practice. |
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