Renault Sylvie, Qualizza Clara, MacKinnon Mike
Department of Botany, 505 Buller Building, University of Manitoba, Winnipeg, MB, Canada R3T 2N2.
Environ Pollut. 2004;128(3):339-49. doi: 10.1016/j.envpol.2003.09.009.
The reclamation of freshly produced composite or consolidated tailings (CT) is a challenge for the Oil Sands Industry in the boreal forest of Western Canada. CT tailings materials are characterized by a relatively high salinity (dominated by sodium, sulphate and chloride) and a high pH (8-9). A greenhouse study was conducted to determine the germination, survival, injury and early plant growth of two grass species recommended for land reclamation, altai wildrye (Elymus angustus Trin) and slender wheatgrass (Agropyron trachycaulum Link Malte), growing in two different oil sand CT tailings (alum-CT and gypsum-CT), with and without peat amendment. Ion accumulation in the resulting plant tissues was determined. Our results showed that slender wheatgrass was most affected by the tailings at the germination stage, while for altai wildrye, the early growth stage was the most sensitive stage. Alum-CT had similar or less negative impact on plants than gypsum-CT. Amendment of CT with peat limited the reduction in germination and growth that was recorded in plants growing directly in CT. Based on these results, recommendations were made to improve reclamation strategies.
回收新产生的复合尾矿或固结尾矿（CT）对加拿大西部北方森林中的油砂行业来说是一项挑战。CT尾矿材料的特点是盐度相对较高（以钠、硫酸盐和氯化物为主）且pH值较高（8-9）。开展了一项温室研究，以确定推荐用于土地复垦的两种草种，即窄颖赖草（Elymus angustus Trin）和细茎冰草（Agropyron trachycaulum Link Malte），在两种不同的油砂CT尾矿（明矾-CT和石膏-CT）中生长时，有无泥炭改良情况下的发芽、存活、损伤和早期植物生长情况。测定了所生成植物组织中的离子积累情况。我们的结果表明，细茎冰草在发芽阶段受尾矿影响最大，而对于窄颖赖草来说，早期生长阶段是最敏感的阶段。明矾-CT对植物的负面影响与石膏-CT相似或更小。用泥炭改良CT限制了直接在CT中生长的植物所记录到的发芽和生长减少情况。基于这些结果，提出了改进复垦策略的建议。
