Blended municipal compost and biosolids materials for mine reclamation: Long-term field studies to explore metal mobility, soil fertility and microbial communities

摘要: Abstract Application of stable soil amendments is often the key to successful phytostabilization and rehabilitation mine tailings, microbial guilds are primary drivers many geochemical processes promoted by these amendments. Field studies were set up at a tailings management area near Sudbury, Ontario examine performance blends lime stabilized municipal biosolids compost nine different rates over thick (1 m) covers planted with agricultural crops. Based on biogeochemical variability substrates four ten years after application initial cover, experimental plots could be classified into three categories: “Low” rate (0–100 t ha−1 biosolids), “Medium” (200–800 t ha−1), “High” (1600–3200 t ha−1) treatments. The addition materials cover higher than 100 t ha−1 significantly reduced C:N ratio substrates, available phosphorus, some nutrient cations, while notably increasing inorganic carbon potential solubility Ni Cu. This suggests that may not equivalently ameliorate quality stability. Correspondingly, communities altered additions, further intensifying negative impacts long-term efficiency cover. Abundance cellulose, hemicellulose, lignocellulose decomposers (as mineralization humification) was Most DNA sequences high affinity denitrifiers detected in treatments where conditions optimal for denitrification activities. These findings have implications improving reclamation environmental programs northern temperate climates.