物探与化探2025，Vol.49Issue(2)：479-489,11.DOI:10.11720/wtyht.2025.2409
福建省沙化土地地球化学评价及其方法研究
Geochemical evaluation and related method of desertified land in Fujian Province,China
摘要
Abstract
Based on high-precision,high-quality data on SiO2,Al2O3,Fe2O3,and organic matter in topsoils obtained from the 1:250,000-scale multi-purpose regional geochemical survey in Fujian Province,this study assessed topsoils and,for the first time,established a geochemical method-based geochemical assessment system for desertified land in the province.Specifically,this system involves methods for calculating the silicon-aluminum-iron ratio(Saf),carbon-silicon ratio(KSi),and their comprehensive index val-ue(Szh_f),which serves as the indicator for assessing the degree of land desertification.Specifically,a higher Szh_f value indicates a higher degree of desertification,and vice versa.Furthermore,this study determined the statistics of geochemical classification param-eters for desertified land in Fujian Province and delineated the distribution ranges of geochemical grades.This aims to assess the cur-rent status of desertified land in the province from the microscopic perspective of soil elements and to further ascertain the distribution characteristics of the land.The results indicate that the land with strong,moderate,slight,and very slight desertification in Fujian Province exhibits areas of 39 531 hectares(0.326％),65,790 hectares(0.542％),103 601 hectares(0.853％),and 360 329 hec-tares(2.968％),respectively,primarily distributed along the coastal zone to the south of the Minjiang River and in Changting County of Longyan City.Field verification demonstrates that this evaluation method is scientific and reliable and yields accurate classification results of desertification grades,thus objectively reflecting the distribution status of desertified land in Fujian Province.关键词
沙化土地/地球化学/方法研究/分布特征/福建Key words
desertified land/geochemistry/methodology/distribution characteristics/Fujian Province分类
资源环境引用本文复制引用
王文俊..福建省沙化土地地球化学评价及其方法研究[J].物探与化探,2025,49(2):479-489,11.基金项目
中国地质调查局地质调查项目(DD20160321) （DD20160321）
福建省地勘基金地质科技创新提升项目(闽地地任[2022]25号) （闽地地任[2022]25号）
