弥河流域土壤中钴、钼、硒、锌空间分布及来源分析

为研究弥河流域表层土壤中钴(Co)、钼(Mo)、硒(Se)、锌(Zn)的空间分布及其来源，在弥河流域不同用地类型表层土壤中采集48个样品，测定四种微量元素含量及其他土壤理化指标，并采用空间插值和正定矩阵因子分析(positive matrix factorization, PMF)等数理方法进行了数据分析。结果显示，研究区内Co、Mo、Se、Zn均存在不同程度的富集现象，其中在耕地中富集程度最高。Co和Mo的高浓度区主要分布在临朐-青州-昌乐三县交界地带，Se的高浓度区主要分布在研究区西部，Zn的高浓度区主要分布在研究区西南部。土壤中Co含量主要受铁锰氧化物和土壤质地影响，Mo主要受铁锰氧化物影响，Se主要受N、P、有机质影响，Zn主要受N、P、有机质和土壤质地影响。PMF模型源解析表明研究区内Co、Mo、Se、Zn的主要来源为自然源、农业源和交通-工业混合源，所占比例分别为44.6%、35.7%和19.7%,其中Co、Se主要来源于自然源(48.7%、51.3%),Mo、Zn则自然源、农业源和交通-工业混合源均衡。

Spatial Distribution and Source Analysis of Cobalt, Molybdenum, Selenium and Zinc in Soil of Mihe River Basin

In order to study the spatial distribution and sources of cobalt (Co), molybdenum (Mo), selenium (Se) and zinc (Zn) in the surface soil of the Mihe River Basin, 48 samples were collected from the surface soil of different land types in the Mihe River Basin, four trace elements content and other soil physical and chemical indexes were determined, and mathematical methods such as spatial interpolation and positive definite matrix factor analysis (PMF) were used to analyze the data. The results showed that Co, Mo, Se and Zn all had different degrees of enrichment in the study area, with the highest enrichment in cultivated land. The high concentration areas of Co and Mo were mainly distributed in the junction of Linqu-Qingzhou-Changle, the high concentration areas of Se were mainly distributed in the west of the study area, and the high concentration areas of Zn were mainly distributed in the southwest of the study area. The content of Co in soil was mainly affected by iron-manganese oxide and soil texture, Mo was mainly affected by iron-manganese oxide, Se was mainly affected by N, P and organic matter, and Zn was mainly affected by N, P, organic matter and soil texture. PMF model source analysis showed that the main sources of Co, Mo, Se and Zn in the study area were natural sources, agricultural sources and transportation-industrial mixed sources, accounting for 44.6%, 35.7% and 19.7%, respectively, of which Co and Se were mainly derived from natural sources (48.7% and 51.3%), while Mo and Zn were balanced from natural sources, agricultural sources and transportation-industrial mixed sources.