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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Tree establishment on post-mining waste soils: species, density, and mixture effects
Canadian Journal of Forest Research, Volume 52, No. 1, Year 2022
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Description
Tree establishment to restore degraded boreal post-mining lands is challenged by low soil productivity, a harsh microclimate, and potentially high contaminant levels. The use of mixed vegetation can facilitate the microclimate but increase competition for soil resources. A statistical accounting of plant–plant interactions and adaptation to multispecies conditions is hard to achieve in field experiments; trials under controlled conditions can distinguish effects of planting density and species interactions in the early stages of plant establishment. A greenhouse trial was established in containers (“mesocosms”) withwasterockorfine tailings from gold mines. Pregerminated (1-week-old) seedlings (Alnus viridis subsp. crispa, Picea glauca, Populus tremuloides, Salix arbusculoides) were planted using a Nelder density gradient design, modified for species combinations. A relative competition effect was estimated as a competitiveness index for each species combination, calculated as a ratio of a coefficients in the Holliday growth equation. The specific leaf area (SLA) was measured to indicate plant water stress adaptation. All species grew better in monoculture on fine tailings, while only P. tremuloides grew better in all mixtures on waste rock. Although net positive effects of density on SLA increment during early growth suggested microclimate improvement on fine tailings, no mixture provided advantages for both species in paired combinations. © 2021 The Author(s).
Authors & Co-Authors
Asmara, Degi Harja
Canada, Quebec
Université Laval
Allaire, Suzanne Edith
Unknown Affiliation
Van Noordwijk, Meine V.
Indonesia, Bogor
Icraf World Agroforestry Centre, Bogor
Khasa, Damase Phambu
Canada, Quebec
Université Laval
Statistics
Citations: 1
Authors: 4
Affiliations: 2
Identifiers
Doi:
10.1139/cjfr-2021-0044
ISSN:
00455067
Research Areas
Environmental