贵州耕地主要元素地球化学背景值统计与分析

利用贵州省耕地质量地球化学调查评价项目数据资料,统计了全省454431件表层耕地土壤样品中21种化学元素和有机质含量的地球化学背景值及其置信范围值。总体来看,贵州省耕地土壤有机质、N、P等养分的背景值较高,K的背景值略低;Se、Ge特色元素的背景值较高,表明我省具有发展富硒、富锗特色农业的巨大潜力;As、Cr、Hg、Pb等环境元素的背景值较低,但Cd的背景值略高,在耕地开发利用时应关注其安全性。贵州省耕地土壤化学元素背景值的统计对全面认识全省耕地土壤养分质量、环境质量现状具有重要的现实意义,也对制定耕地土壤质量保护法规及地方标准的提供了重要依据。

Statistics and Analysis of Geochemical Backgrounds of Main Elements of Cultivated Land in Guizhou Province

Based on the data from the survey and evaluation project of cultivated land quality in Guizhou Province, the geochemical background values and their confidence range values of 21 chemical elements and organic matter contents in 454,431 surface cultivated soil samples were counted. On the whole, the background values of soil organic matter, N, P of cultivated land in Guizhou Province are relatively high, but K are slightly lower; the background values of Se and Ge characteristic elements are relatively high, indicating that our province has huge potential of the development of characteristic agriculture; the background values of environmental elements such as As, Cr, Hg, Pb are low, but Cd is slightly higher, so attentions should be paid to its safety in the development and utilization of cultivated land. The statistics of the background values of soil chemical elements in cultivated land in Guizhou Province have important practical significance for comprehensive understanding of the soil nutrient quality and environmental quality of cultivated land in the province, and also provide an important basis for the formulation of cultivated land soil quality protection laws and local standards.