安徽省金寨县土地质量地球化学评价

Geochemical Evaluation of Land Quality in Jinzhai County,Anhui Province

为了解金寨县土地质量现状,明确土壤有益、有害元素地球化学组成、分布分配特征及其对土地质量的影响程度,开展金寨县土地质量地球化学调查评价(1:50 000)工作,采集表层土壤样品6 079件,测试分析土壤样品中22项元素指标,以土地利用现状图斑为最小评价单元,综合评价得到土地质量地球化学等级。结果表明,金寨县土地质量总体良好,一等(优质)土地1 074 km^(2),占比为27.42%、二等(良好)土地1 877.85 km^(2),占比为47.93%、三等(中等)土地543.37 km^(2),占比为13.87%、但仍存在四等(差等)和五等(劣等)土地48.46 km^(2),占比为1.24%。圈定富硒土壤288.46 km^(2)、富锌土壤1 350.286 km^(2)。研究结果为土地管护、特色土地资源开发利用和乡村振兴提供科学依据。

In order to understand the status quo of land quality in Jinzhai County,and to clarify the geochem-ical composition,distribution characteristics of beneficial and harmful elements in soil and their impact on land quality,a geochemical investigation and evaluation of land quality(1:50000)was carried out in Jinzhai County.A total of 6079 surface soil samples were collected,and 22 elements in the soil samples were test-ed and analyzed.Taking the status quo map of land use as the minimum evaluation unit,the geochemical grade of land quality was comprehensively evaluated.The results showed that the land quality in Jinzhai County was generally good,with 1074 km^(2) of the first-class(high-quality)land,accounting for 27.42%,1877.85 km^(2) of the second-class(good)land,accounting for 47.93%,542.37 km^(2) of the third-class(medi-um)land,accounting for 13.87%,but there were still 48.46 km^(2) of the fourth-class(poor)and the fifth-class(worse)land,accounting for 1.24%.The delineation of selenium-rich soil was 288.46 km^(2),and zinc-rich soil was 1350.286 km^(2).The results provide a scientific basis for land management and protection,ex-ploitation and utilization of characteristic land resources,and rural revitalization.