全国地球化学基准网建立与土壤地球化学基准值特征

China soil geochemical baselines networks:Data characteristics

全球一致性和权威性地球化学观测数据是资源与环境评价的定量标尺。中国实施的"全国地球化学基准计划"作为"全球地球化学基准计划"的一部分,于2008—2014年实施,建立了覆盖全国的地球化学基准网。按照1∶20万图幅为网格单元,在全国1600个网格单元中,共部署3382个汇水域采样基准点,每个基准点同时采集了表层和深层土壤样品,共计采集6617件样品,使用高精度分析技术和严格的质量控制,分析了81个地球化学指标。本文首次给出了全国土壤81个指标地球化学基准值数据,初步阐释了地球化学基准值数据和空间分布特征与地质背景、成矿作用、表生作用以及人类活动的关系。

World- recognized harmonious geochemical baselines data are used to quantify environmental changes and mineralresources. The China Geochemical Baselines （CGB） project, as a part of Global Geochemical Baselines, was implemented from2008-2014. The China Geochemical Baselines Networks with approximately 1600 reference grids cover the whole China. 6617 soilsamples from 3382 drainage catchments were collected across China’s whole mainland. 81 geochemical parameters including 78chemical elements plus other 5 indicators were determined. China geochemical baselines data and maps were produced across thewhole China. The baselines data and maps of 76 elements have correlation with geology, mineral resources, climate and human activities.