Pengaruh revegetasi terhadap sifat-sifat tanah pada lahan bekas tambang tembaga di Nusa Tenggara Barat

Copper mining activities using open-pit mining techniques operate more frequently than underground mining techniques. Open-pit mining activities in copper mines cause various detrimental impacts on the environment, one of which is overburden waste in waste dump areas. Overburden rock piles have the potential to generate acid mine drainage (AMD) which can cause a decrease in soil pH and an increase in heavy metal toxicity. Waste dump area is one of the focus areas that require reclamation to restore land degradation that has occurred. Reclamation efforts that can be carried out include revegetation using pioneer plants and cover crops. The aim of this research is to analyze soil physical and chemical properties improvement after revegetation on copper post-mining land as an evaluation and to provide recommendations in future reclamation. The research was carried out by analyzing and interpreting laboratory data from soil observations in revegetation areas for the 2016, 2018, 2019 and 2020 planting years, as well as natural forests belonging to PT. Amman Mineral Nusa Tenggara. Revegetation of copper post-mining land does not show a significant improvement in soil physical properties because improving physical properties takes quite a long time, especially in post-mining areas with heavy structural damage. Soil chemical properties analysis shows that revegetation can increase base saturation (BS), cation exchange capacity (CEC), exch-Ca, exch-Mg, and reduce soil Al saturation. In contrast, soil pH, organic-C, total-N, and soil available-P in the revegetation area did not increase as the revegetation age increased. The effect of revegetation appears to be more significant at the age of 2 to 3 years. However, based on the Tukey test, the age of revegetation mostly does not have a significant effect on enhancing soil chemical properties.