GLCM Jaworzyna Krynicka Loess Plateau Songnen Plain absolute altitude agricultural engineering agricultural environment antibiotics in soils bacterial community bacterial diversity biochar coal mining compost fertility contamination cultivated land quality farmland consolidation heavy metals high-throughput sequencing industries of concern karst areas land use types manure microbial community microorganisms opencast coalmine prevention distance saturated hydraulic conductivity soda saline–alkali soil soil soil and water resources