Geochemical evaluation and selenium-rich characteristics of land quality in Ganzhou City

Based on the surface soil data obtained from the multi-target regional geochemical survey in Ganzhou City, the paper studies the geochemical characteristics of Se in soil and carries out the geochemical evalution of land quality. The results show that the variation coefficient of soil Se belongs to moderate fluctuation type, with Se-rich soil or Se-depleted soil partly, and the Se content has significant negative correlation with pH value. The Se-rich soil area is 4 224 km², accounting for 10.76% of the total area, soil with moderate Se content is 29 248 km², accounting for 74.49% of the total area, soil with marginal Se content is 5 280 km², accounting for 13.45% of the total area and Se-deficient soil is 512 km² which accounting for 1.30% of the total area. The overall land quality in the study area is good, with fine-grade soil dominated, accounting for 57.83%, and medium-grade soil accounting for 40.01%, a few poor-grade and bad-grade soils accounting for 2.16%.