Phytomanagement - Thann (F-68)

The experimental site of Thann is located in the valley of the Thur in Alsace (France) near the border with Germany and Switzerland, on a 15 ha-chemistry-based industrial complex. The Thann plant owned by the TRONOX company is one of the most important sites for TiO2 production in Europe and is the second-largest production facility in the world. The Ti extraction process generates tailings made of red gypsum from the neutralization and precipitation of effluents containing sulfuric acid, which is used to dissolve the metals contained in the ore. Red gypsum, a solid residue enriched with Fe, S and Mn, is stored on the Ochsenfeld landfill (Alsace, France), located on an 80-ha landfill 3 km away from the industrial complex. Experiments carried out at the site aim at:
1) establishing a flora inventory of a red gypsum-formed technosol located at the Ochsenfeld site in order to determine the main chemical drivers of the native vegetation that occurred after 10 years of inactivity
2) identifying a panel of woody species with phytoremediating capacities, either within a phytostabil-ization strategy (high productivity, low metal accumulation), or within a phytoextraction strategy (high productivity, high metal accumulation) (PROLIPHYT project)
3) characterizing the root microbial communities associated to Betula pendula, which is the pioneer colonising vegetation (PHYTOCHEM project)

坦恩（Thann）实验场地位于法国阿尔萨斯地区的图尔（Thur）河谷，临近德国与瑞士边境，坐落于一处占地15公顷的化工类工业园区内。TRONOX公司旗下的坦恩工厂是欧洲最重要的二氧化钛（TiO₂）生产基地之一，同时也是全球第二大此类生产设施。
钛提取工艺会产生以红石膏为主要成分的尾矿：这类尾矿来自对含硫酸废水的中和与沉淀工序，而硫酸正是用于溶解矿石中所含金属的试剂。红石膏是一种富含铁（Fe）、硫（S）与锰（Mn）的固体残余物，被储存于距离该工业园区3公里外、占地80公顷的奥森费尔德（Ochsenfeld）填埋场（位于法国阿尔萨斯地区）。
本场地开展的实验旨在达成以下目标：
1) 对奥森费尔德场地内由红石膏形成的人为土（technosol）开展植物区系清查，以明确该场地闲置10年后自然定植的本土植被的主要化学驱动因子；
2) 筛选具备植物修复潜力的木本植物类群，既可用于植物稳定化（phytostabilization）策略（高生产力、低金属富集量），也可用于植物提取（phytoextraction）策略（高生产力、高金属富集量）——该研究隶属于PROLIPHYT项目；
3) 对作为先锋定植植被的垂枝桦（Betula pendula）相关的根系微生物群落进行表征分析——该研究隶属于PHYTOCHEM项目。