土地质量地球化学评价方法研究与应用——以山东省沂南县东部地区为例

Study and Application of Geochemical Evaluation Method of Land Quality——Setting Eastern Yi'nan County in Shandong Province as an Example

摘要:

为了查明土壤中有益、有害元素和污染指标的含量分布特征和质量等级，本文通过开展1∶5万土地质量地球化学调查，采集表层土壤样品4779件，分析测试了养分元素和环境元素指标，进行了土地质量地球化学评价和研究。结果表明，研究区表层土壤质量以优质、良好等级为主。沂河、汶河两河流域土壤肥力较好，西北部、中东部山区丘陵地区肥力相对差。土壤中的Mo、B、V元素以及有机质含量相对匮乏。区内土壤环境质量水平整体较好，重金属元素分布除受地质背景控制外，与研究区内矿山开采密切相关。在此基础上，进行土壤酸性缓冲能力预警和富硒农用地规划研究工作，为现代农业产业布局提供科学依据，助力乡村振兴战略。

Abstract:

In order to find out the content, distribution characteristics and quality level, geochemical investigation of land quality with the scale of 1∶50000 have been carried out. In this work, 4779 surface soil samples have been collected systematically, the indexes of nutrient elements and environmental elements have been analyzed and tested, and geochemical evaluation and study of land quality in the study area have been carried out. It is showed that the surface soil quality in the study area is mainly of high quality and good grade. The soil fertility of Yihe basin and Wenhe basin is good, while the fertility of mountainous and hilly areas in northwest, middle and east parts are relatively poor. The contents of Mo, B, V and organic matter in soil are relatively scarce. The overall soil environmental quality level in the area is good. The distribution of heavy metals is not only controlled by geological background, but also closely related to mining in the study area. On this basis, the early warning of soil acid buffer capacity and the planning and research of selenium rich agricultural land are carried out to provide a scientific basis for the layout of modern agricultural industry and help the strategy of rural revitalization.