Les routes minérales en tourbières à sphaignes : restauration par enfouissement
|Abstract:||The electric power transmission lines network spans across the territory of the province of Québec on 34 000 kilometers and some of its sections inevitably go through peatlands. This restoration project has been conducted on two peatlands where access roads were constructed under power lines: at Sainte-Eulalie (Centre-du-Québec) and Chénéville (Outaouais). A mineral road in a peatland changes the nature of the substrate and can influence the water table level and the physicochemical characteristics of the water and peat. These changes can modify the composition and diversity of the vegetal communities. We examined if burying the mineral material within the bog is an effective method to restore the peatland conditions. The restoration by the “Burial Under Peat Layer Method” (BUPLM) consists in excavating and burying the mineral material beneath the underlying peat material. The method should allow to reach restorations goals by (1) confining the nutrients introduced with the mineral material, (2) by conserving a peaty surface elevation similar to the adjacent areas and (3) by re-establishing typical peatland vegetation. Whether it is 1 or 3 years post-restoration, the results of the physicochemical analyses of the water sampled at various depths and distances of the buried road showed similar nutriments concentrations to the means observed in the reference ecosystems. The soil elevation differences in the restored areas between readings are insignificant. Less than a growth season post-restoration, the Sphagnum mosses cover at Chénéville is 33 ± 9 %. At Sainte-Eulalie, 3 years post-restoration, the Sphagnum cover is lower (5 ± 3 %) because of the quality and quantity of the material available in the drained right-of-way. The results of this project show that the BUPLM complies with restoration objectives. Furthermore, it is economically profitable in comparison with the complete removal of the mineral material.|
|Document Type:||Mémoire de maîtrise|
|Open Access Date:||24 April 2018|
|Collection:||Thèses et mémoires|
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