Nutrient supply to the upper soil 1990 (environmental atlas)

Presentation of the nutrient supply of the upper soils (0-3 dm) on a block and block surface basis, 1: 50,000, as of 1990.本数据集展示了截至1990年、比例尺1:5万、以图幅及图幅表面为统计单元的上层土壤（0-3分米）养分供给状况。