Data from a pot scale experiment with mine tailing material and Agrostis capillaris L. alone, or mixed with Melilotus albus Medik

The data set consists of a file with four sheets: one includes a legend (treatment number, treatment code, description, and code for the other measurements at time zero (t=0); the second sheet contains data lab at time zero, which is a matrix with 67 rows and 38 columns. In this matrix there are variables measured for the characterization of a mine tailing (MT) substrate sampled from three points on the Valea Șesei pond with five replicates each, top soil (TS) used as amendment and sampled from a single point in five replicates near the pond, and green fertilizers used (Tr - a mixture of Trifolium pratense L. and Trifolium repens L., and Ms - Medicago sativa) in one composite sample for each species from which five replicates were used. In addition, a screening of the elements uptakes from the MT was done in two pioneer species found on the pond, nine individuals of Tussilago farfara L. roots (RT) and shoots (ST), and six individuals of Equisetum arvense L. roots (RE) and shoots (SE). A second screening was done for the elements in the water (the first four samples were from sampling points downstream of the pond, and the last three were sampled from the tailing pond, from the accessible areas. In the third sheet, with 282 rows and 45 columns, the results of the variables measured in Technosol and in the vegetation obtained from 14 experimental treatments using TS, Tr, Ms, F1%, or F2% (Rhizophagus irregularis L.), and plants are presented. The 14 treatments result from an inoculation gradient of 3 treatments (green color in the data matrix) embedded in a larger gradient of nitrogen and toxic elements (three more treatments, light blue color), and one additional treatment with the mentioned M. sativa (yellow color). The seven treatments were planted with one (Agrostis capillaris L.) or two species (A. capillaris and M. albus Medick.). The sampled vegetation consisted of A. capillaris roots and shoots in single culture, as well as A. capillaris L. grown together with M albus, including both roots and shoots. In the fourth spreadsheet, a table with calculations for mycorrhizal colonization is presented, consisting of 47 rows and 57 columns. Experimental design and data interpretation are provided in an article under evaluation submitted to Scientific Reports with the title “Increasing the fungal inoculation of mine tailings from 1 to 2% decreases plant oxidative stress and increases the soil respiration rate”.

Keywords: arbuscular mycorrhizal fungi, heavy metals, nitrogen, biogeochemistry, phytoremediation, Technosol