淮北平原覆盖区土壤采样密度及其环境质量研究——以1∶5万高炉集幅为例

以1∶5万高炉集幅为研究对象,在6个点/km 2及4个点/km 2两种采样密度条件下,土壤元素在地球化学参数特征及空间分布上均相近,表明该图幅内采样密度4个点/km 2可以满足1∶5万土地质量调查评价工作的要求。基于不同采样密度下土壤元素地球化学特征的对比分析,提出淮北平原覆盖区地质背景相对单一的连片耕地区开展1∶5万土地质量调查时可采用最低采样密度(4个点/km 2)。土壤环境质量评价结果显示,区内土壤环境质量优良,以优先保护类土壤为主,安全利用类土壤仅零星分布,影响土壤环境质量的指标为Cd,研究结果可为该地区实施绿色无公害产业发展提供科学依据。

Research on soil sampling density and environmental quality of Huaibei plaincovered area: A case study of 1∶50 000 Gaoluji Sheet

1∶50000 Gaoluji Sheet was chosen as the research object in this study.The soil elements at two sampling densities of 6 points/km 2 and 4 points/km 2 are similar in geochemical parameter characteristics and spatial distribution.The sampling density of 4 points/km 2 in the map can meet the requirements of 1∶50,000 land quality survey and evaluation work.Based on the comparative analysis of the geochemical characteristics of soil elements under different sampling densities,the authors hold that the minimum sampling density(4 points/km 2)can be used when 1∶50,000 land quality survey is conducted in a relatively continuous farming area in the Huaibei plain coverage area.The soil environmental quality evaluation results show that the quality of the soil environment in this area is excellent.The priority is given to protecting the soil,and the safe use type soil is only in scattered distribution.The main impact indicator is Cd.The results can provide a scientific basis for the implementation of green pollution-free industries in this area.