Abstract:
Based on the soil nutrient and environmental data obtained from the 1:250 000 geochemical survey of land quality covering 3 000 km
2 in eastern Oroqen Qi, this study evaluates the soil nutrient abundance/deficiency and environmental quality in accordance with DZ/T 0295"Specifications for Geochemical Evaluation of Land Quality" and GB15618 "Soil Environmental Quality Risk Control Standard for Soil Contamination of Agricultural Land (Trial)". The results show that soil nutrient in the study area is predominantly assigned as Grade I (abundant) and Grade II (relatively abundant), accounting for 75.1% and 24.4% of the total area respectively. No Grade IV (relatively deficient) or Grade V(deficient) nutrient soils are identified yet, although B, Cu and Mg are deficient. The soil environmental quality is primarily classified as Grade I (risk-free), covering over 97% of the area, with Zn, Hg and Pb concentrations maintaining risk-free grade throughout the region. The comprehensive geochemical land quality is mainly Grade I (excellent), encompassing 2 920 km
2 or 97.34% of the total area. This study may provide geological data support for promoting high-quality agricultural economic development in Oroqen Qi.