Influence of Aspen on Forest Floor Properties in Black Spruce-dominated Stands Article Received: 13 July 2004 Accepted: 27 January 2005 DOI:
Cite this article as: Légaré, S., Paré, D. & Bergeron, Y. Plant Soil (2005) 275: 207. doi:10.1007/s11104-005-1482-6 Abstract
In the absence of fire in black spruce-feathermoss stands, a thick forest floor layer dominated by bryophytes and sphagnum accumulates. This layer is associated with wet, cool and nutrient-poor soil conditions conducive to the paludification process and pushing the ecosystem towards an unproductive open black spruce forest. The presence of
Populus tremuloides in theses stands may halt this process because this species has a high nutrient cycling rate and a litter that represses moss cover. The main hypothesis of this study is that, despite similar abiotic conditions (slope and drainage), the presence of Populus tremuloides in a stand dominated by Picea mariana affects surface soil nutrient availability, total N, pH as well as the decomposition process. The abundance of Populus tremuloides trees was associated with higher exchangeable cations, cationic exchangeable capacity and pH of the forest floor layer on all sites. A decrease in organic matter thickness with increasing aspen presence was also found on all sites, suggesting that this species affects the decomposition process by the quality of its litter as well as by a general improvement of soil physical and chemical properties. The decomposition rate of a standard substrate as well as in vitro potential net nitrogen mineralization were positively related to Populus tremuloides on only one of the three sites, and non-significant on the other sites. Strong immobilization of added nitrogen during incubation was observed on all sites and was not related to aspen, which suggested that in these stands, the soil microbial community is uniformly and strongly nitrogen limited. The zone of influence of Populus tremuloides was evaluated in areas around the soil sampling plot ranging from 3 to 7 m. The results revealed that this zone varies with soil properties. The results suggest that the presence of Populus tremuloides accelerate nutrient cycling, which could affect stand productivity to some extent. Keywords Mixed stand nitrogen nutrient cycle Picea mariana Populus tremuloides References Alban, D H 1982 Effects of nutrient accumulation by aspen, spruce, and pine on soil properties Soil Sci. Soc. Am. J. 46 853 861 CrossRef Google Scholar Alban, D H, Pastor, J 1993 Decomposition of aspen, spruce, and pine boles on two sites in Minnesota Can. J. For. Res. 23 1744 1749 Google Scholar Bergeron, Y, Bouchard, A 1984 Use of ecological groups in analysis and classification of plant communities in a section of western Quebec Vegetatio 56 45 63 CrossRef Google Scholar Bergeron, Y, Gauthier, S, Kafka, V, Lefort, P, Lesieur, D 2001 Natural fire frequency for the eastern Canadian boreal forest: consequences for sustainable forestry Can. J. For. Res. 31 384 391 CrossRef Google Scholar
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