安徽省岳西县来榜地区土地质量地球化学评价

Geochemical assessment for land quality in the Laibang area, Yuexi County of Anhui Province

以安徽省西南部岳西县来榜地区为研究区,按8个点/km^2的密度采集表层土壤样品,系统分析了该区土壤样品中Cd、Hg、As、Se等21项元素的含量及相关指标特征。采用土地利用现状图斑作为评价单元,参照土地质量地球化学评价规范对来榜地区土地质量进行地球化学评价。结果表明:来榜地区土地环境综合质量状况优质,达到一等环境质量的土地面积占研究区总面积的97.14%;土壤养分综合质量中等以上的土地面积占研究区总面积的88.05%。土地质量地球化学综合等级以二等土地为主,面积占研究区总面积的66.87%;其次为一等土地,面积占研究区总面积的18.57%。研究区土壤整体缺乏硒,但部分茶叶富硒。上述结论可为研究区土地质量生态管理、土地合理规划及利用提供参考。

This study selected the Laibang area in Yuexi County southwest of Anhui Province as the research area. Surface soil samples were collected at a density of 8 points/km^2. Twenty-one elements such as Cd, Hg, As, Se, etc. were tested and relative index characteristics were also analyzed. Land quality in the Laibang area was assessed using polygons of current land use as well as the specification of land quality geochemical assessment. The results show that the comprehensive geochemical grade of land soil quality in the Laibang area is excellent, with 97.14 percent of the research area up to the first grade of environmental quality and more than 88.05 percent to the medium grade of comprehensive nutrients quality. The comprehensive geochemical grade of land quality is mainly second-class, accounting for 66.87% of the total study area, followed by first-class land, accounting for 18.57%. The study area is depleted in selenium but some tea is rich in selenium. This conclusion provides a scientific basis for ecological management of land quality and rational planning of land use.