南京市溧水区表层土壤锗地球化学特征及影响因素

锗(Ge)是一种生命所必需的微量元素，对人体具有广泛的保健功效。富Ge土壤具有广阔的开发利用价值，但目前我国对土壤Ge的研究程度相对较低。选择南京市溧水区为研究区，在土地质量地球化学调查的基础上，对研究区表层土壤Ge的含量及空间分布特征进行研究，分析地质背景对土壤Ge分布的影响。结果表明，南京市溧水区表层土壤Ge平均含量为1.40 mg/kg,土壤Ge含量主要受控于地质背景，空间分布也与地质背景高度吻合。土壤Ge含量高值区主要为侏罗系大王山组出露区，岩性主要以粗安质、安山质火山岩为主，第四系沉积物分布区土壤Ge含量相对较低。土壤中Ge含量与pH值关系不显著，与土壤中有机质含量呈一定的负相关关系，与Cr、Co、Ni、As呈明显的正相关关系。土地质量地球化学评价结果表明研究区土壤Ge丰富的面积为84.18 km²,占全区总面积的10.84%,全区基本没有Ge缺乏的地区。研究探讨了南京市溧水区表层土壤锗含量、空间分布特征及其影响因素等，可为我国土壤锗的生态地球化学研究提供基础资料，对于富锗土壤资源的科学开发利用具有指导意义。

Geochemical Characteristics and Influencing Factors of Germanium in Surface Soil of Lishui District,Nanjing City

Germanium (Ge) is an essential trace element for life and has extensive health care effects on the human body. It is valuable to develop Ge-rich soil, whereas the research on soil Ge is still insufficient in China.Based on the results of land quality geochemical survey in Lishui district, Nanjing, the content and spatial distribution characteristics of Ge in surface soil and the influence of geological background on soil Ge were studied in this paper.The results revealed that the average Ge content in surface soil of Lishui district was 1.40 mg/kg, which was mainly controlled by geological background and its spatial distribution was highly consistent with geological background.The high value area of Ge content is mainly the outlying area of J₃d^1-2, and the lithology is mainly trachyandensite and andesite, while the Quaternary sediment distribution area has relatively low Ge content.There was no significant relationship between Ge and pH value in the soil, there was a certain negative correlation with organic matter content, and an obvious positive correlation with Cr, Co, Ni and As. The Ge-rich soil area in the study area is 84.18 km², accounting for 10.84% of the total area of the whole region, and there is basically no Ge deficient area in the whole region.In this paper, the content, spatial distribution and influencing factors of Ge in surface soil of Lishui district, Nanjing were discussed, which can provide basic data for the ecological geochemical study of Ge in soil in China, and have guiding significance for the scientific development and utilization of Ge-rich soil resources.