naa a22 4500 510750508 CHVBK 20180411083102.0 cr unu---uuuuu 180411e20130301xx s 000 0 eng 10.1007/s11270-013-1471-y doi (NATIONALLICENCE)springer-10.1007/s11270-013-1471-y Short- and Long-Term Effects of Modified Humic Substances on Soil Evolution and Plant Growth in Gold Mine Tailings [Elektronische Daten] [Carl Szczerski, Christian Naguit, John Markham, Tee Goh, Sylvie Renault] Mining creates large amounts of processed waste in the form of mine tailings. Sulfide mine tailings are of particular concern due to the biotic and abiotic oxidation of sulfide minerals that release acidity and metals into the environment. Revegetation can be employed to mitigate the spread of tailings in the environment. Revegetation often involves ameliorating tailings with organic materials to promote plant growth and improve tailings physicochemical structure. We amended plots in the Central Manitoba Mine tailings pond with humic substances applied at rates up to 4g C kg−1 through roto-tilling and seeded with Medicago sativa and Elymus trachycaulus in 2003 and 2004. The humic substances improved tailings fertility by increasing macro aggregation, organic carbon, and macronutrients but also resulted in a short-term increase in electrical conductivity levels. In the first growing season the humic amendment had little effect on plant yield, except in the 2003 experiment where the yield of E. trachycaulus decreased by 84% with 4g C kg−1 amendment. After 7years, the addition of humic amendment resulted in a cover of over 38% for M. sativa, compared to less than 2% in control plots. In addition, non-seeded species cover increased with amendment rate in the 2003 experiment but not the 2004 experiment, most likely due to lower pH in the latter. Our results suggest that short-term patterns of plant performance do not reflect longer-term performance or invasion by volunteer plant species. Our long-term data suggest that humic amendments can be effective in establishing plant invasion of mine tailings, although the effects vary depending on the pH of the tailings. Springer Science+Business Media Dordrecht, 2013 Humic substances nationallicence Tailings amendment nationallicence Medicago sativa nationallicence Elymus trachycaulus nationallicence Plant growth nationallicence Land reclamation nationallicence Tailings structure nationallicence Szczerski Carl Department of Biological Sciences, University of Manitoba, R3T 2N2, Winnipeg, Manitoba, Canada aut Naguit Christian Department of Biological Sciences, University of Manitoba, R3T 2N2, Winnipeg, Manitoba, Canada aut Markham John Department of Biological Sciences, University of Manitoba, R3T 2N2, Winnipeg, Manitoba, Canada aut Goh Tee Department of Soil Science, University of Manitoba, R3T 2N2, Winnipeg, Manitoba, Canada aut Renault Sylvie Department of Biological Sciences, University of Manitoba, R3T 2N2, Winnipeg, Manitoba, Canada aut Water, Air, & Soil Pollution Springer Netherlands 224/3(2013-03-01), 1-14 0049-6979 224:3<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1471-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1471-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Szczerski Carl Department of Biological Sciences, University of Manitoba, R3T 2N2, Winnipeg, Manitoba, Canada aut NATIONALLICENCE 700 1- Naguit Christian Department of Biological Sciences, University of Manitoba, R3T 2N2, Winnipeg, Manitoba, Canada aut NATIONALLICENCE 700 1- Markham John Department of Biological Sciences, University of Manitoba, R3T 2N2, Winnipeg, Manitoba, Canada aut NATIONALLICENCE 700 1- Goh Tee Department of Soil Science, University of Manitoba, R3T 2N2, Winnipeg, Manitoba, Canada aut NATIONALLICENCE 700 1- Renault Sylvie Department of Biological Sciences, University of Manitoba, R3T 2N2, Winnipeg, Manitoba, Canada aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/3(2013-03-01), 1-14 0049-6979 224:3<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer